Sevilleta National Wildlife Refuge, near Albuquerque, New Mexico

\log

12/03/97 - Date this file created. G. Shore.
12/20/97 - Updated documentation. G. Shore.
10/30/01 - Added date/time fields to APPENDIX II section. G. Shore.


\doc

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DATA SET CODE AND TITLE

SEV031 AVHRR Biweekly Composites (1991)


##############################################################
ABSTRACT
This dataset contains 21 separate 14-day composited AVHRR
images for 1991 clipped approximatedly to the New Mexico State
boundaries (plus 50 Km buffer around boundary). These were
obtained from the U.S. Geological Survey's EROS Data Center (EDC),
National Mapping Division, from the "CONTERMINOUS U.S. AVHRR BIWEEKLY
COMPOSITES" CD product series.


##############################################################
KEYWORDS
SEV031 AVHRR Advanced_Very_High_Resolution_Radiometer NOAA Satellite_Imagery Remote_Sensing USGS_EROS_Data_Center 1991


##############################################################
TABLE OF CONTENTS
I. WHY THE DATA WERE COLLECTED
II. WHEN THE DATA WERE COLLECTED
III. WHO IS INVOLVED WITH THE DATA
IV. WHERE TH DATA WERE COLLECTED
V. HOW THE DATA WERE COLLECTED AND PROCESSED BY THE USGS EDC
VI. HOW THE DATA WERE PROCESSED BY THE SEVILLETA IMS (SIMS)
VII. APPENDIX I - USGS EDC Metadata
VIII. APPENDIX II - Pixel Date Attribute Table


##############################################################
I. WHY THE DATA WERE COLLECTED

See the U.S. Geological Survey's EROS Data Center (EDC)
documentation in APPENDIX I below.


##############################################################
II. WHEN THE DATA WERE COLLECTED

Twenty-one 14-day composites for 1991. See the U.S. Geological
Survey's EROS Data Center (EDC) documentation in APPENDIX I below
for specific composite periods.


##############################################################
III. WHO IS INVOLVED WITH THE DATA

SOURCE AGENCY CONTACTS:
See the U.S. Geological Survey's EROS Data Center (EDC) documentation
in APPENDIX I below for USGS EDC contacts.

LOCAL SEVILLETA LTER CONTACTS:
Primary contact:
Greg Shore, Sevilleta LTER (gshore@sevilleta.unm.edu).

Principle investigators:
Bruce Milne, Sevilleta LTER (bmilne@sevilleta.unm.edu)

GIS/GPS specialist:
Greg Shore, Sevilleta LTER (gshore@sevilleta.unm.edu).

Data Management
Greg Shore, Sevilleta LTER (gshore@sevilleta.unm.edu)


##############################################################
IV. WHERE THE DATA WERE COLLECTED

The original biweekly composited images covered the
Conterminous United States. However, the images were clipped
to the approximate New Mexico State boundaries (plus 50 Km buffer
around boundary) for online access purposes, while the full U.S.
scenes are stored offline on tape. The clipping coordinates were
selected to perform exact clipping, so no resampling was required.
The approximate online (NM clipped) boundaries are:

Latitude/Longitude, decimal degrees (Clarke 1866 spheroid)
XMIN: -109.515170 YMIN 30.759247 XMAX -102.454601 YMAX 37.817184

Lambert Azimuthal Equal-area (see EDC document for projection info)
XMIN: -914000 YMIN -1529000 XMAX -216000 YMAX -795000

The source and the clipped images are in the following map projection:
Lambert Azimuthal Equal Area projection
Parameters:
Radius of sphere 6,370,997.0 meters
Longitude of central meridian 100 00 00 West
Latitude of origin 45 00 00 North
False easting 0
False northing 0
Units of measure meters
Pixel size 1,000 meters

Each clipped image has 735 rows and 699 columns, and has a cell size
of 1000 x 1000 m.

See the U.S. Geological Survey's EROS Data Center (EDC) documentation
in APPENDIX I below for spatial extent, projection information, etc.,
related to the full Conterminous US scenes.


##############################################################
V. HOW THE DATA WERE COLLECTED AND PROCESSED BY THE USGS EDC

See the U.S. Geological Survey's EROS Data Center (EDC)
documentation in APPENDIX I below.


##############################################################
VI. HOW THE DATA WERE PROCESSED BY THE SEVILLETA IMS (SIMS)

The general SIMS processing steps for each biweekly composite
period were to read the 10 image bands off the source USGS-EDC CD,
concatenate/import them into a 10-band ERDAS Imagine format image
file, georegister to the USGS-EDC specifications, clip the scene
to the approximate New Mexico State boundaries, move the clipped
scene to the online SIMS archive, and write the full scene to
offline tape.

The band order in the archived scenes is:

1- NOAA CHANNEL 1 6- NDVI
2- NOAA CHANNEL 2 7- SATELLITE ZENITH
3- NOAA CHANNEL 3 8- SOLAR ZENITH
4- NOAA CHANNEL 4 9- RELATIVE AZIMUTH
5- NOAA CHANNEL 5 10- DATE

The bands are described in detail in the U.S. Geological Survey's
EROS Data Center (EDC) documentation in APPENDIX I below. The
attribute data for the "DATE" band is found in APPENDIX II below.

A more precise description of the processing steps is as follows:

1. Mount AVHRR CD

2. Read the 10 bands of information off the CD for each biweekly composited
scene, concatenate 21 NULL bytes onto the last line of each band, concatenate
the 10 bands into a single file, then import as an ERDAS Imagine 10-band
image file (of size 2889 rows x 4587 cols). This process was automated
with the C-shell script:

/db/local/imagery/bincom/avhrr_import.csh 91

NOTE: this generates 10-band ERDAS Imagine format files, that are of
image size 2889 rows x 4587 cols, with filenames as follows:

avhrr91pPP.img

where: PP = bi-weekly growth period number

and bands in following order::
1- NOAA CHANNEL 1 6- NDVI
2- NOAA CHANNEL 2 7- SATELLITE ZENITH
3- NOAA CHANNEL 3 8- SOLAR ZENITH
4- NOAA CHANNEL 4 9- RELATIVE AZIMUTH
5- NOAA CHANNEL 5 10- DATE

3. Georegister the scene as follows:
Bring up ERDAS Imagine GUI, then Tools->ImageInfo tool and do:
1. File->Open->avhrr91pPP.img
2. Edit->Change Map Model:
a. Upper Left X: -2050000
b. Upper Left Y: 752000
c. Pixel Size X: 1000
d. Pixel Size Y: 1000
e. Units: meters
f. Projection: Lambert Azimuthal Equal-area
NOTE: click OK, then answer "Yes" to changing Map Model in all layers.
3. Edit->Add/Change Projection:
a. Spheroid Name: Sphere of Radius 6370997m
b. Datum Name: Undefined
c. Longitude of center of projection: 100:00:00 W
d. Latitude of center of projection: 45:00:00 N
e. False easting: 0.0 meters
f. False northing: 0.0 meters
NOTE: click OK, then answer "Yes" to changing Map Model in all layers.
4. Edit->Change Layer Name:
a. Change bands 1 - 5 to Channel_1, Channel_2, ..., Channel_5,respectively
b. Change band 6 to NDVI
c. Change bands 7 - 10 to SATELLITE_ZENITH, SOLAR ZENITH,
RELATIVE_AZIMUTH, and DATE, respectively

4. Clip full-scene to New Mexico minimum bounding box (+50 Km buffer) with
coordinates ULx = -914000, ULy = -795000, LRx = -216000, LRy = -1529000,
and dimensions 735 rows x 699 columns. This process was automated with
the C-shell scripts:

/db/local/imagery/bincom/batch_avhrr_clip2nm.csh, which calls:
/db/local/imagery/bincom/avhrr_clip2nm.csh avhrr91pPP.img avhrr91pPPnm.img

NOTE: this generates 10-band ERDAS Imagine format files, that are of
image size 735 rows x 699 cols, with filenames as follows:

avhrr91pPPnm.img

5. Unix compress the NM clipped image, make an archive directory, and move it
to the archive destination (/db/archive/imagery/avhrr/avhrr91pPP/). This
process was automated with the C-shell scripts:

/db/local/imagery/bincom/avhrr_archive.csh

NOTE: this generates Unix compressed files with filenames as follows:

avhrr91pPPnm.img.Z

6. Compress (gzip) and archive the full scene image to 4mm DAT tape, then
remove from online disk:

gzip avhrr91pPP.img
mt -f /dev/rmt/0cn fsf <#>
tar cvf /dev/rmt/0cn avhrr91pPP.img.gz
rm avhrr91pPP.img.gz

7. Copy the most current yearly "USGS-EDC-AVHRR Dataset README" file off CD for
inclusion in the online SIMS IAF metadata file (avhrr91.dbf) for the images
(note, must also convert from DOS to Unix file):

dos2unix /cdrom/cdrom0/readme.1st avhrr91readme.1st

8. Copy the "Date of Acquisition by Pixel" attribute file off each CD, then
split by biweekly period for inclusion in GIS/RS Metadata Abstract file
(avhrr91pPPnm.mda), and merge by year for inclusion in SIMS IAF metadata
file (avhrr91.dbf):

dos2unix /cdrom/cdrom0/geom/date.att avhrr91pPP-PPdate.att

/db/local/imagery/bincom/batch_avhrr_split_dateatt.csh, which calls:
/db/local/imagery/bincom/avhrr_split_dateatt.csh

/db/local/imagery/bincom/avhrr_concat_dates.csh 91 > avhrr91date.att

9. Generate (this) SIMS IAF metadata file (i.e., avhrr91.dbf) using template
file (avhrr_dbf.tmpl), appending readme file (avhrr91readme.1st), and date
file (avhrr91date.att).

10. Generate GIS/RS Metadata Abstract file for each image, and put with
image in appropriate directory (/db/archive/imagery/avhrr/avhrr91pPP/):

/db/local/imagery/bincom/get_avhrr_dates.csh 91 avhrr91.dbf 97 \
> avhrr91periods.txt

/db/local/imagery/bincom/batch_make_avhrr_abstract.csh avhrr91periods.txt
which calls:
/db/local/imagery/bincom/make_avhrr_abstract.csh


##############################################################
VII. APPENDIX I - USGS EDC Metadata

THE 1991 CONTERMINOUS U.S. AVHRR BIWEEKLY COMPOSITES
CONTENTS


Introduction . . . . . . . . . . . . . . . . . . . . . . . .Page 1

Data Set Characteristics . . . . . . . . . . . . . . . . . . . . 3

Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Scene Selection . . . . . . . . . . . . . . . . . . . . . . . 3
Radiometric Calibration . . . . . . . . . . . . . . . . . . . 3
Satellite and Solar Viewing Geometry. . . . . . . . . . . . . 5
Date of Acquisition . . . . . . . . . . . . . . . . . . . . . 5
Geometric Registration. . . . . . . . . . . . . . . . . . . . 5
Normalized Difference Vegetation Index. . . . . . . . . . . . 8
Compositing . . . . . . . . . . . . . . . . . . . . . . . . . 9
Miscellaneous Data. . . . . . . . . . . . . . . . . . . . . .11

CD-ROM Organization. . . . . . . . . . . . . . . . . . . . . . .14

References . . . . . . . . . . . . . . . . . . . . . . . . . . .16


THE 1991 CONTERMINOUS U.S. AVHRR BIWEEKLY COMPOSITES
INTRODUCTION

In 1987, the U.S. Geological Survey's EROS Data Center (EDC),
in Sioux Falls, South Dakota, began receiving Advanced Very High
Resolution Radiometer (AVHRR) data from NOAA polar-orbiting
satellites. The central location of the EDC in the United States
enables direct reception of all AVHRR overpasses of the lower 48
States, as well as much of Canada and Mexico. Early in the 1990
growing season the EDC started acquiring NOAA-11 AVHRR 1-km
resolution daily observations to produce weekly and biweekly
maximum normalized difference vegetation index (NDVI) composites
of the conterminous United States. The objective of the
vegetation mapping program is to compile, annually, a
comprehensive series of calibrated, georegistered, daily
observations and biweekly maximum NDVI composites. These data
are being published on CD-ROM for easy distribution of the data
set. These data sets can be used in environmental monitoring and
global climate change studies.

The vegetation diversity of the conterminous United States
provides opportunities for using both AVHRR data and the NDVI for
monitoring vegetation condition in several different ecosystems,
including forests, agricultural crops, and grasslands. The data
set provides a comprehensive growing season profile of these
ecosystems, is extremely useful for assessing seasonal variations
in vegetation condition, and provides a foundation for studying
long-term changes resulting from human or natural factors.


DATA SET CHARACTERISTICS

The data set is composed of twenty-one 14-day maximum NDVI
composites that were created from nearly 500 NOAA-11 images. The
17 core composite periods represent a continuous period from
March 1, 1991, to October 22, 1991. The first two (periods 1 and
2) and last two (periods 20 and 21) composites represent a 2-week
period each for January, February, November, and December.

Each daily observation includes nine bands of information:
AVHRR channels 1-5, NDVI, satellite zenith, solar zenith, and
relative azimuth. The daily observations have been calibrated to
reflectance, scaled to byte data, and geometrically registered to
the Lambert Azimuthal Equal Area map projection.

Each 14-day composite includes 10 bands of information, the 9
bands described above for each daily observation and a 10th band,
which is a pointer to identify the date of the source daily
observation scene. The data for each pixel in the composite are
extracted from the daily observation scene on the basis of the
maximum NDVI compositing process.

The 14-day composite periods for 1991 were:

____________________________________________________
Period Date of coverage Julian day
____________________________________________________

1 01/04 - 01/17/1991 004 - 017
2 02/01 - 02/13/1991 032 - 045
3 03/01 - 03/14/1991 060 - 073
4 03/15 - 03/28/1991 074 - 087
5 03/29 - 04/11/1991 088 - 101
6 04/12 - 04/25/1991 102 - 115
7 04/26 - 05/09/1991 116 - 129
8 05/10 - 05/23/1991 130 - 143
9 05/24 - 06/06/1991 144 - 157
10 06/07 - 06/20/1991 158 - 171
11 06/21 - 07/04/1991 172 - 185
12 07/05 - 07/18/1991 186 - 199
13 07/19 - 08/01/1991 200 - 213
14 08/02 - 08/15/1991 214 - 227
15 08/16 - 08/29/1991 228 - 241
16 08/30 - 09/12/1991 242 - 255
17 09/13 - 09/26/1991 256 - 269
18 09/27 - 10/10/1991 270 - 283
19 10/11 - 10/24/1991 284 - 297
20 11/08 - 11/21/1991 312 - 325
21 12/06 - 12/19/1991 340 - 353
____________________________________________________
The image dimensions of each band are 2,889 lines and 4,608
samples (13 megabytes).

PROCEDURES

The sections that follow describe the data processing flow
that was used at EDC to create a composite data set. All image
processing was conducted using the Land Analysis System (Ailts
and others, 1990) software.


Scene Selection

Cloud free AVHRR observations of the land surface are
necessary for monitoring the vegetation conditions. A single
AVHRR overpass is seldom completely cloud free. Holben (1986)
showed that compositing AVHRR data acquired over several days
produces spatially continuous cloud free imagery over large areas
with sufficient temporal resolution to study green vegetation
dynamics. The duration of consecutive daily observations is
called the compositing period. On a daily basis during a
composite period, each observation of NOAA-11 data over the
conterminous United States was evaluated for cloud cover.
Typically, there are two satellite overpasses per day, one over
the eastern portion of North America and a second pass over the
western part of the continent. Every image that provided a clear
observation of a large ground surface area at reasonable nadir
viewing angles was included in the composite. On an average, 18
daily observations per biweekly period were included in the
composite.


Radiometric Calibration

Radiometric calibration of the AVHRR visible and near-infrared
channels (channels 1 and 2) is an important consideration since
there is poor preflight calibration, no on board calibration, and
difficulty with inflight calibration. Preflight calibration
coefficients can change while the instrument is in storage or after
launch due to the space environment. Degradation of AVHRR sensors
after launch has been well documented (Rao, 1987; Price, 1987;
Holben et al, 1990). Several studies have used stable sites such
as homogeneous desert targets to monitor the degradation of the
sensors after the satellite has been launched. The EDC accounted
for sensor degradation by using modified preflight gain
coefficients developed from a study by Holben et al (1990) that was
based on measurements of desert targets. The adjusted gain
coefficient for channel 1 is 0.09325 and 0.08475 for channel 2.

Besides radiometric calibration, the solar illumination
variability which occurs in the north/south direction within an
orbit was corrected using the cosine of the solar zenith angle.
The calibration and solar illumination correction of channels 1 and
2 was completed using the following formula:

R=(d*d/z)*(a+b*c)

=(d*d*a)/z + (d*d*b*c)/z

where:
R is reflectance

d is the mean earth-sun distance in astronautical units

z is the cosine of the solar zenith angle

a is the intercept

b is the gain coefficient

c is the digital count

Reflectance values for channels 1 and 2 were converted to byte
data where the range 0 - 254 represents 0 to 63.5% reflectance
(0.25% per bin) and the value 255 is a grouping of reflectance
values greater than 63.5%. Any feature with greater than 63%
reflectance is a cloud, snow, or other bright non-vegetated
surface.

The calibration coefficents for AVHRR thermal channels 3,4,
and 5 are derived onboard the satellite using a view of a stable
blackbody and deep space as a reference (Kidwell, 1988). The
calibration process converts raw data values to energy
(milliwatts/m2-steradians-cm-1) using the following formula:

E=a+bc

where:

E is energy

a is the intercept

b is the gain coefficient

c is the digital count

Energy is converted to brightness temperature using the
inverse of Planck's radiation function. The brightness
temperatures are represented in Kelvin units. A scaling factor was
used to convert the brightness temperatures to byte data. A
scaling factor of 202.5 is subtracted from the brightness
temperature value and the difference is multiplied by 2 to maintain
one half percent accuracy (i.e., a brightness temperature of 280
becomes 155).


Satellite and Solar Viewing Geometry

The availability of the viewing geometry information allows
studies on the effects of off-nadir viewing and the investigation
of potential data correction techniques.

The computation of the solar/satellite geometry is a process
that derives the satellite zenith, solar zenith, and relative
azimuth angle for each image pixel. The relative azimuth is the
absolute difference between the satellite and solar azimuth
angles. The computed angles do not exceed 180 degrees. A
separate image band is created for each of these three angle
computations.

The satellite zenith angle is computed in degrees, in which
nadir is represented as 90 degrees. Therefore, values less than
90 degrees represent view angles in the backscattered (easterly)
direction and values greater than 90 represent the forward
scatter (westerly) direction. Note that the effective field of
view of the satellite is approximately 55 degrees each side of
nadir, but computed satellite zenith angles can exceed 55 degrees
because of the curvature of the Earth.

The relative azimuth angle is computed as the absolute
difference between the solar azimuth and the satellite azimuth
angles. The computed values are in the 0 - 180 range. The
relative azimuth angle is computed instead of separate azimuth
angles because only the absolute difference between the azimuth
angles is required for atmospheric correction algorithms. Also,
saving only the computed relative azimuth angle requires only one
band in a daily observation and composite image instead of two,
which reduces the image storage requirements on CD-ROM.


Date of Acquisition

The date of acquisition images are provided to allow a user
to identify the specific daily observation used for each pixel.
The date images for each composite identify each daily input
image as a unique value. The unique value is linked to an
inventory of the daily observations. A complete list of daily
observations used in each composite period is on this CD-ROM
under the \GEOM directory in file DATE.ATT.


Geometric Registration

The process of compositing daily observations for each
biweekly period required each daily overpass to be registered to
a common map projection to ensure that, from day to day, each 1-
km pixel represented the same ground location. The map
projection chosen for the data on these CD-ROM's was the Lambert
Azimuthal Equal Area. This projection is appropriate for the
North American continent because of its visual presentation, and
equal area characteristic, which allows easy measurement of area
throughout the data set.

To perform the image-to-image registration of the data a base
image was developed as a reference. Tests have shown that the
best way to prepare the base image is to register individual
daily orbits to an accurate base map. The map base used was the
hydrography layer of the United State Geological Survey
1:2,000,00-scale Digital Line Graph (DLG). The features in the
DLG data, such as water bodies, rivers, and streams, are
identifiable features in the AVHRR 1-km data. The DLG were
rasterized to 1 km cells and registered to the Lambert Azimuthal
Equal Area map projection before being used as the map base for
the data.

Approximately 20 near-nadir cloud free segments of NOAA-11
channel 2 daily observations from the 1989 growing season were
manually registered to the DLG data. Each segment was verified
for accuracy (root-mean-square error less than 1.0 pixel). The
segments were digitally mosaicked to produce a single base image
of the conterminous United States for registering the 1991
growing season data. The accuracy of this base image was
verified with a root-mean-square error less than 1.0 pixel.
Table 1 provides details on projection parameters.

Table 1. Lambert Azimuthal Equal Area (LAZEA) projection
_______________________________________________________________
Parameters:
Radius of sphere 6,370,997.0 meters
Longitude of central meridian 100 00 00 West
Latitude of origin 45 00 00 North
False easting 0
False northing 0
Units of measure meters
Pixel size 1,000 meters

For the conterminous United States (1991)
Center of pixel (1,1) ( -2050000, 752000 )
Number of lines 2,889
Number of samples 4,587
LAZEA minimum bounding rectangle:
In projection meters:
Lower left ( -2050500, -2136500 )
Upper left ( -2050500, 752500 )
Upper right ( 2536500, 752500 )
Lower right ( 2536500, -2136500 )

In decimal degrees of latitude and longitude:
Lower left ( -119.9722899 23.5837576 )
Upper left ( -128.5300591 48.4030555 )
Upper right ( -65.3946489 46.7048989 )
Lower right ( -75.4163527 22.4793919 )

In degrees, minutes, and seconds of latitude and longitude:
Lower left ( -119 58 20 23 35 02 )
Upper left ( -128 31 48 48 24 11 )
Upper right ( -65 23 41 46 42 18 )
Lower right ( -75 24 59 22 28 46 )
________________________________________________________________


Each daily observation for the 1991 growing season was
registered to the base image using image-to-image correlation.
First, the channel 2 data for each daily observation were roughly
transformed using the satellite transformation information in the
ephemeris data. Next, correlation was performed using a set of
255 selected ground control points. If all the ground control
points were cloud covered in the daily observation, no
correlation was defined and the image was rejected. Otherwise,
the correlation was determined and the satellite transformation
coefficients were revised. Then the raw data (channels 1 - 5)
and satellite geometry data were transformed using the revised
coefficients and nearest neighbor resampling.


Normalized Difference Vegetation Index (NDVI)

NDVI was calculated from calibrated data that were scaled to
byte range and geometrically registered. The NDVI is the
difference of near-infrared (AVHRR channel 2) and visible (AVHRR
channel 1) reflectance values divided by total reflectance:

IR(channel 2) - Visible(channel 1)
NDVI = ----------------------------------------
IR(channel 2) + Visible(channel 1)

The equation produces NDVI values in the range of -1.0 to 1.0,
where negative values typically represent clouds, snow, water,
and other non vegetated surfaces and positive values represent
vegetated surfaces.

In order to scale the computed NDVI results to byte data
range, the NDVI computed value, which range from -1.0 to 1.0, was
scaled to the range of 0 to 200, where computed -1.0 equals 0,
computed 0 equals 100, and computed 1.0 equals 200. As a result,
NDVI values less than 100 now represent clouds, snow, water, and
other non vegetative surfaces and values greater than 100
represent vegetative surfaces.


Compositing

The method for determining the portion of each overpass to be
included in the composite image was to retain pixels having the
highest NDVI values. The NDVI was examined pixel by pixel for
each overpass within the biweekly compositing period to determine
the maximum value.

The retention of the highest NDVI reduces the number of cloud
contaminated pixels because values for clouds and cloud shadows
are generally less than 100 (in the byte scaled data) and clear
day observations of vegetated surfaces are greater than 100 (in
the byte-scaled data). The result is a near cloud free image
that depicts the maximum vegetative greenness for the compositing
period.

The output of the compositing process was a 10-band image
that included the maximum NDVI value for each pixel during the
composite period, the channel 1-5 and satellite viewing geometry
data from the chosen daily observations, and a pointer value that
identified the satellite overpass from which that pixel was
taken. Table 2 lists the data included in each of the 10 bands.

Table 2.- Band description of composite images
_________________________________________________________________
Band Description Band Description
_________________________________________________________________

1 AVHRR channel 1 6 NDVI
2 AVHRR channel 2 7 Satellite zenith
3 AVHRR channel 3 8 Solar zenith
4 AVHRR channel 4 9 Relative azimuth
5 AVHRR channel 5 10 Date
_________________________________________________________________

The date of acquisition pointer is provided to allow a user
to identify the specific AVHRR daily observation (satellite scene
number) used for each pixel. To determine the date and scene
number, first identify the date pointer value for the pixel
within a composite period, then use the reference table in file
DATE.ATT to determine the scene number.


Miscellenous Data

When displaying data large areas with AVHRR data, an overlay
or mask of familiar linework, such as county boundaries, can be
used as a location aid. Several images are included in the \MISC
directory to provide location information. All of the linework
images represent lines in raster format as 1 km cells. These
data sets include climatic division boundaries (CDLINES), major
land resource areas boundaries (LRALINES), and county boundaries
(CTYLINES). The climatic division lines were digitized from NOAA
base maps. The county lines are a modified version of the
1:2,000,000 Digital Line Graph data. The major land resource
area boundaries were digitized from United State Department of
Agriculture's Soil Conservation Service (1981) maps.

The linework in the CDLINES and LRALINES images was coded at
the byte value 255. In the CTYLINES image, the county boundaries
identified by the coasts and international borders are at value
253, the county borders that are coincident with State borders
are at value 254, and other county boundaries are at value 255.
This variable coding provides the capability to display coastal,
State, or county boundaries from the same image.

Also included are three raster polygon images that can be
used in an overlay process where histograms or descriptive
statistics could be computed for the NDVI values within a
polygon. These images include counties (CTYPOLY), major land
resource areas (LRAPOLY), and climatic divisions (CDPOLY).

Each polygon is in raster format and has a unique numeric
identifier. Images that include more than 256 unique polygons
are stored in I*2 integer (16 bit) format.

The attribute information that identifies or characterizes
each polygon are included under the \MISC directory. The
attributes for the county polygons are in CTYPOLY.ATT. The
fields in the file are:

cntyid -- the unique polygon identification number
npixels -- the number of pixels in each county
FIPS -- the Federal Information Processing Standard State
and county code for each county
cname -- the county name
sname -- the State name
The attributes for the major land resource area polygons are in
LRAPOLY.ATT. The fields in the file are:

polyid -- the unique polygon identification number
mlra -- the major land resource area (MLRA) identification
code used by the Soils Conservation Service
lratext -- text description of the MLRA used by the Soil
Conservation Service

The unique polygon identification number for the climatic
division polygons can be parsed into the State and climatic
division number within that State. For example, climatic
district one in Arizona is polygon number 401. The 4 is the FIPS
State identification number for Arizona, and the 01 identifies
the polygon as division one. Climatic district one in Oklahoma
is polygon number 4001, where 40 is the FIPS State code and 01 is
division one.

Table 3 - A list of miscellaneous image file characteristics
-----------------------------------------------------------------
Name Type Bands Lines Samples
-----------------------------------------------------------------
LRAPOLY I*2 1 2,889 4,608
LRALINES Byte 1 2,889 4,608
CDPOLY I*2 1 2,889 4,608
CDLINES Byte 1 2,889 4,608
CTYPOLY I*2 1 2,889 4,608
CTYLINES Byte 1 2,889 4,608
-----------------------------------------------------------------

CD-ROM ORGANIZATION

A large volume of data was generated during the construction
of this data base. The data stored on each CD-ROM required ten
6,250-bpi magnetic tapes. The data are organized in a directory
structure that logically separates the data components. This
structure is:

README.1ST
\AVHRR
README \LABELS \IMAGES
\NDVI
README \LABELS \IMAGES
\GEOM
README \LABELS \IMAGES
\MISC
README \LABELS \IMAGES

Each directory on the disc contains data that are similar in
type. Each directory also contains an ASCII text file (README)
that details the contents of the directory.

The data files and LAS header files (files with name
extensions .DDR) are in the \IMAGES subdirectories, and the image
label files are in the \LABELS subdirectories. The binary image
files were put on the CD-ROM with a 512-byte header record.
This header record is used by the LAS image processing system.

To get a quick start looking at the image files, label files
for each image are included in the \LABELS directory using the
same file name as the image file it describes in the \IMAGES
subdirectory. These label files were designed for use by the
public domain MS-DOS personal computer IMDISP image display
software developed by NASA's Jet Propulsion Laboratory in
Pasadena, CA. IMDISP users can access the images
on this CD-ROM by selecting the image name in the \LABELS
subdirectory, which automatically will access all header
information the software requires and quickly will retrieve the
image data.

The actual data dimensions of each band are 2,889 lines and
4,587 samples (13 megabytes), but the images are stored as 2,889
lines and 4,608 samples to accommodate LAS software. The last 21
samples of each image are blank (zero) to make each line a
multiple of 512 as required by LAS.

The \AVHRR directory contains the five channels of AVHRR data
associated with the four biweekly composites on each CD-ROM.
Each band of each biweekly composite file is uniquely named using
the convention:

P01CH1.IMG

where P01 identifies composite period 1 and CH1 identifies the
image as channel 1. The image files are stored in the \IMAGES
subdirectory.

The \NDVI directory contains the single band computed NDVI
for the biweekly AVHRR composite data sets and name using the
convention:

P01NDVI.IMG

where P01 identifies composite period 1 and NDVI identifies the
image as a vegetation index image. The image files are stored in
the \IMAGES subdirectory.

The \GEOM directory contains the satellite and solar zenith
and relative azimuth information for each pixel in the AVHRR
composite images. This directory also contains the date images
for each of the composites, as well as the DATE.ATT attribute
file.

The \MISC directory contains the political (CTYLINES,
CTYPOLY), climatic divisions (CDLINES, CDPOLY), and land resource
area (LRALINES, LRAPOLY) raster line and polygon images which are
useful for display or in digital analysis procedures. Attribute
files related to these are included as files CTYPOLY.ATT and
LRAPOLY.ATT.

For more detailed technical information please contact
Customer Services, EROS Data Center, U.S. Geological Survey,
Sioux Falls, SD 57198, (605)594-6151, FAX (605)594-6589.

REFERENCES

Abel, Peter, 1990, Calibration of NOAA-11 AVHRR visible and near
IR channels, National Oceanic and Atmospheric Administration,
National Environmental Satellite Data, and Information Service,
Satellite Research Laboratory, Washington, D.C., Technical
Report.

Ailts, B., Akkerman, D., Quirk, B., and Steinwand, D., 1990, LAS
5.0 -- an image processing system for research and production
environments, American Society for Photogrammetry and Remote
Sensing-American Congress on Surveying and Mapping Annual
Convention, Denver, Colorado, [date], Proceddings, v. 4, p. 1-12.

Holben, B.N., 1986. Characteristics of maximum-value composite
images from temporal AVHRR data: The International Journal of
Remote Sensing, v. 7, no. 11, p. 1417.

Holben, B.N., Kaufman, Y.J., and Kendall, J.D., 1990, NOAA-11
AVHRR visible and near-IR inflight calibration: The International
Journal of Remote Sensing, v. 11, no. 8, p. 1511.

Kidwell, K.B., 1988, NOAA Polar Orbiter Data Users' Guide, National
Oceanic and Atmospheric Administration, World Weather Building,
Room 100, Washington, D.C.

Price, John C., 1987, Calibration of satellite radiometers and the
comparison of vegetation indices: Remote Sensing of the
Environment, v. 21, no. 15, pp. 15-27.

Rao, Nagaraja C. R., 1987, Pre-launch calibration of channels 1 and
2 of Advanced Very High Resolution Radiometer: NOAA Technical
Report NESDIS 36, Satellite Research Laboratory, National
Environmental Satellite, Data, and Information Service, Washington,
D.C., 62 p.

Teillet, P.M., 1991, Radiometric and atmospheric correction
procedures for AVHRR preprocessing in the solar reflective channels
in 5th International Colloqium on Spectral Signatures of Objects in
Remote Sensing, Courchevel, France, 1991, Proceedings:
U.S. Department of Agriculture, Soil Conservation Service, 1981,
Land resource regions and major land resource areas of the United
States: Agricultural Handbook 296, 156 p.


##############################################################
VIII. APPENDIX II - Pixel Date Attribute Table


PERIOD INDEX SCENEID Date GMT
------ ----- ---------------- ------- --------
1 1 AH11010891183803 01-08-91 18:38:03
2 AH11010491192355 01-04-91 19:23:55
3 AH11011791220533 01-17-91 22:05:33
4 AH11011591204330 01-15-91 20:43:30
5 AH11011391210546 01-13-91 21:05:46
6 AH11011291211711 01-12-91 21:17:11
7 AH11011391192415 01-13-91 19:24:15
8 AH11011491191316 01-14-91 19:13:16
9 AH11011591190208 01-15-91 19:02:08
2 1 AH11020591215342 02-05-91 21:53:42
2 AH11020691214150 02-06-91 21:41:50
3 AH11020791213000 02-07-91 21:30:00
4 AH11020191205526 02-01-91 20:55:26
5 AH11020691195713 02-06-91 19:57:13
6 AH11020391185104 02-03-91 18:51:04
7 AH11020291190222 02-02-91 19:02:22
8 AH11020791194559 02-07-91 19:45:59
9 AH11020491183820 02-04-91 18:38:20
10 AH11020391185003 02-03-91 18:50:03
101 AH11021191204348 02-11-91 20:43:48
102 AH11021491200948 02-14-91 20:09:48
103 AH11021091191327 02-10-91 19:13:27
104 AH11020991192442 02-09-91 19:24:42
105 AH11020891193523 02-08-91 19:35:23
106 AH11020891211825 02-08-91 21:18:25
3 1 AH11030191204317 03-01-91 20:43:17
2 AH11030491201001 03-04-91 20:10:01
3 AH11030591195751 03-05-91 19:57:51
4 AH11030591182005 03-05-91 18:20:05
5 AH11030791211705 03-07-91 21:17:05
6 AH11030691212844 03-06-91 21:28:44
7 AH11030691194652 03-06-91 19:46:52
8 AH11030691180931 03-06-91 18:09:31
9 AH11030791193538 03-07-91 19:35:38
101 AH11030891210528 03-08-91 21:05:28
102 AH11030991191329 03-09-91 19:13:29
103 AH11031191185138 03-11-91 18:51:38
104 AH11031291201945 03-12-91 20:19:45
105 AH11031291184054 03-12-91 18:40:54
106 AH11030991205350 03-09-91 20:53:50
107 AH11030891192441 03-08-91 19:24:41
108 AH11031391200828 03-13-91 20:08:28
109 AH11031391215154 03-13-91 21:51:54
110 AH11031491195713 03-14-91 19:57:13
4 1 AH11031791210448 03-17-91 21:04:48
2 AH11031891205311 03-18-91 20:53:11
3 AH11031991190150 03-19-91 19:01:50
4 AH11031991204144 03-19-91 20:41:44
5 AH11032091185054 03-20-91 18:50:54
101 AH11032491194512 03-24-91 19:45:12
102 AH11032591193355 03-25-91 19:33:55
103 AH11032391195613 03-23-91 19:56:13
104 AH11032691192258 03-26-91 19:22:58
105 AH11032791205201 03-27-91 20:52:01
106 AH11032791191143 03-27-91 19:11:43
107 AH11032891222632 03-28-91 22:26:32
108 AH11032891190045 03-28-91 19:00:45
109 AH11032891204038 03-28-91 20:40:38
5 1 AH11033091220126 03-30-91 22:01:26
2 AH11032991202900 03-29-91 20:29:00
3 AH11033191200617 03-31-91 20:06:17
4 AH11033191182811 03-31-91 18:28:11
5 AH11033091201738 03-30-91 20:17:38
6 AH11033191214925 03-31-91 21:49:25
7 AH11040291194352 04-02-91 19:43:52
8 AH11040291212538 04-02-91 21:25:38
9 AH11040191195458 04-01-91 19:54:58
10 AH11040391193233 04-03-91 19:32:33
11 AH11040391175627 04-03-91 17:56:27
12 AH11040391211354 04-03-91 21:13:54
13 AH11040491210211 04-04-91 21:02:11
101 AH11040591205028 04-05-91 20:50:28
102 AH11040591190915 04-05-91 19:09:15
103 AH11040691185651 04-06-91 18:56:51
104 AH11040691203901 04-06-91 20:39:01
105 AH11040791221201 04-07-91 22:12:01
106 AH11040791184825 04-07-91 18:48:25
107 AH11040891215940 04-08-91 21:59:40
108 AH11040791202721 04-07-91 20:27:21
109 AH11040991214803 04-09-91 21:48:03
110 AH11040991200320 04-09-91 20:03:20
111 AH11041091213603 04-10-91 21:36:03
112 AH11041191194110 04-11-91 19:41:10
113 AH11041191212419 04-11-91 21:24:19
114 AH11041091195325 04-10-91 19:53:25
6 1 AH11041291211236 04-12-91 21:12:36
2 AH11041291175513 04-12-91 17:55:13
3 AH11041391210054 04-13-91 21:00:54
4 AH11041291193022 04-12-91 19:30:22
5 AH11041491204913 04-14-91 20:49:13
6 AH11041491190750 04-14-91 19:07:50
7 AH11041591203748 04-15-91 20:37:48
8 AH11041591185504 04-15-91 18:55:04
9 AH11041691202606 04-16-91 20:26:06
10 AH11041691184228 04-16-91 18:42:28
11 AH11041791215812 04-17-91 21:58:12
12 AH11041891214609 04-18-91 21:46:09
13 AH11041791201343 04-17-91 20:13:43
101 AH11041991180854 04-19-91 18:08:54
102 AH11041991213422 04-19-91 21:34:22
103 AH11042191211037 04-21-91 21:10:37
104 AH11042191192842 04-21-91 19:28:42
105 AH11042091193935 04-20-91 19:39:35
106 AH11042291205909 04-22-91 20:59:09
107 AH11042291191702 04-22-91 19:17:02
108 AH11042391204720 04-23-91 20:47:20
109 AH11042391190723 04-23-91 19:07:23
110 AH11042491185620 04-24-91 18:56:20
111 AH11042491203552 04-24-91 20:35:52
112 AH11042591202410 04-25-91 20:24:10
113 AH11042591220832 04-25-91 22:08:32
7 1 AH11042791214405 04-27-91 21:44:05
2 AH11042791200120 04-27-91 20:01:20
3 AH11042791182349 04-27-91 18:23:49
4 AH11042891195011 04-28-91 19:50:11
5 AH11042891181251 04-28-91 18:12:51
6 AH11042891213201 04-28-91 21:32:01
7 AH11042991180224 04-29-91 18:02:24
8 AH11042991212013 04-29-91 21:20:13
9 AH11043091210830 04-30-91 21:08:30
10 AH11043091192745 04-30-91 19:27:45
11 AH11050191205644 05-01-91 20:56:44
12 AH11050291190520 05-02-91 19:05:20
13 AH11050291204515 05-02-91 20:45:15
101 AH11050391203346 05-03-91 20:33:46
102 AH11050391185417 05-03-91 18:54:17
103 AH11050491220608 05-04-91 22:06:08
104 AH11050491184330 05-04-91 18:43:30
105 AH11050591215346 05-05-91 21:53:46
106 AH11050591183229 05-05-91 18:32:29
107 AH11050691195912 05-06-91 19:59:12
109 AH11050791194810 05-07-91 19:48:10
110 AH11050891211809 05-08-91 21:18:09
111 AH11050891193647 05-08-91 19:36:47
112 AH11050991192540 05-09-91 19:25:40
113 AH11050991210622 05-09-91 21:06:22
8 1 AH11051091191434 05-10-91 19:14:34
2 AH11051191204306 05-11-91 20:43:06
3 AH11051191190329 05-11-91 19:03:29
4 AH11051291221604 05-12-91 22:16:04
5 AH11051291203122 05-12-91 20:31:22
6 AH11051391201953 05-13-91 20:19:53
7 AH11051391184123 05-13-91 18:41:23
8 AH11051291185225 05-12-91 18:52:25
9 AH11051491215141 05-14-91 21:51:41
10 AH11051491200835 05-14-91 20:08:35
11 AH11051591213936 05-15-91 21:39:36
12 AH11051591195726 05-15-91 19:57:26
13 AH11051591181945 05-15-91 18:19:45
14 AH11051691212747 05-16-91 21:27:47
15 AH11051691194602 05-16-91 19:46:02
101 AH11051891210413 05-18-91 21:04:13
102 AH11051991205228 05-19-91 20:52:28
103 AH11051991191228 05-19-91 19:12:28
104 AH11052091222618 05-20-91 22:26:18
105 AH11052091190124 05-20-91 19:01:24
106 AH11052191221335 05-21-91 22:13:35
107 AH11052191202910 05-21-91 20:29:10
108 AH11052291220126 05-22-91 22:01:26
109 AH11052291183914 05-22-91 18:39:14
110 AH11052391214904 05-23-91 21:49:04
9 1 AH11052591212509 05-25-91 21:25:09
2 AH11052591194341 05-25-91 19:43:41
3 AH11052791210147 05-27-91 21:01:47
4 AH11052791192111 05-27-91 19:21:11
5 AH11052891205001 05-28-91 20:50:01
6 AH11052891191108 05-28-91 19:11:08
7 AH11052991185859 05-29-91 18:58:59
8 AH11052991203830 05-29-91 20:38:30
9 AH11053091202646 05-30-91 20:26:46
101 AH11060191214635 06-01-91 21:46:35
102 AH11060291213429 06-02-91 21:34:29
103 AH11060191182620 06-01-91 18:26:20
104 AH11060391194113 06-03-91 19:41:13
105 AH11060391212238 06-03-91 21:22:38
106 AH11060291195239 06-02-91 19:52:39
107 AH11060491211055 06-04-91 21:10:55
108 AH11060491193011 06-04-91 19:30:11
109 AH11060591205907 06-05-91 20:59:07
110 AH11060591191848 06-05-91 19:18:48
111 AH11060691223330 06-06-91 22:33:30
112 AH11060691204735 06-06-91 20:47:35
10 1 AH11060991215559 06-09-91 21:55:59
2 AH11060791203605 06-07-91 20:36:05
3 AH11060891202420 06-08-91 20:24:20
4 AH11060991183444 06-09-91 18:34:44
5 AH11061091200139 06-10-91 20:01:39
6 AH11061091214351 06-10-91 21:43:51
7 AH11061191195017 06-11-91 19:50:17
8 AH11061291193852 06-12-91 19:38:52
9 AH11061291212013 06-12-91 21:20:13
10 AH11061391192743 06-13-91 19:27:43
11 AH11061391210824 06-13-91 21:08:24
101 AH11061591204504 06-15-91 20:45:04
102 AH11061491191635 06-14-91 19:16:35
103 AH11061891201019 06-18-91 20:10:19
104 AH11061891215325 06-18-91 21:53:25
105 AH11061791202148 06-17-91 20:21:48
106 AH11061791220533 06-17-91 22:05:33
107 AH11061991214117 06-19-91 21:41:17
108 AH11061991195908 06-19-91 19:59:08
109 AH11061691203318 06-16-91 20:33:18
110 AH11061891183231 06-18-91 18:32:31
111 AH11061991182144 06-19-91 18:21:44
112 AH11062091212925 06-20-91 21:29:25
11 1 AH11062291210544 06-22-91 21:05:44
2 AH11062391205355 06-23-91 20:53:55
3 AH11062391191357 06-23-91 19:13:57
4 AH11062591203042 06-25-91 20:30:42
5 AH11062491204222 06-24-91 20:42:22
6 AH11062691184101 06-26-91 18:41:01
7 AH11062691201912 06-26-91 20:19:12
8 AH11062791215031 06-27-91 21:50:31
9 AH11062791200744 06-27-91 20:07:44
10 AH11062791182950 06-27-91 18:29:50
101 AH11062891195632 06-28-91 19:56:32
102 AH11063091211442 06-30-91 21:14:42
103 AH11062991194507 06-29-91 19:45:07
104 AH11070191210254 07-01-91 21:02:54
105 AH11070191192233 07-01-91 19:22:33
106 AH11070291205115 07-02-91 20:51:15
107 AH11070291191120 07-02-91 19:11:20
108 AH11070391203942 07-03-91 20:39:42
109 AH11070391222427 07-03-91 22:24:27
110 AH11070391190013 07-03-91 19:00:13
111 AH11070491221200 07-04-91 22:12:00
112 AH11070491202755 07-04-91 20:27:55
12 1 AH11070591215949 07-05-91 21:59:49
2 AH11070691214739 07-06-91 21:47:39
3 AH11070691200456 07-06-91 20:04:56
4 AH11070791213531 07-07-91 21:35:31
5 AH11070591201625 07-05-91 20:16:25
6 AH11070891212338 07-08-91 21:23:38
7 AH11070891194216 07-08-91 19:42:16
8 AH11070991211153 07-09-91 21:11:53
9 AH11070991193111 07-09-91 19:31:11
10 AH11071091210004 07-10-91 21:00:04
11 AH11071191223408 07-11-91 22:34:08
12 AH11071191190854 07-11-91 19:08:54
101 AH11071291185747 07-12-91 18:57:47
102 AH11071391202511 07-13-91 20:25:11
103 AH11071391184641 07-13-91 18:46:41
104 AH11071491215646 07-14-91 21:56:46
105 AH11071491201340 07-14-91 20:13:40
106 AH11071591182503 07-15-91 18:25:03
107 AH11071591200212 07-15-91 20:02:12
108 AH11071691213243 07-16-91 21:32:43
109 AH11071691195059 07-16-91 19:50:59
110 AH11071691181415 07-16-91 18:14:15
111 AH11071791212051 07-17-91 21:20:51
112 AH11071791193932 07-17-91 19:39:32
113 AH11071891192821 07-18-91 19:28:21
114 AH11071891210900 07-18-91 21:09:00
13 1 AH11071991205710 07-19-91 20:57:10
2 AH11071991191711 07-19-91 19:17:11
3 AH11072091204536 07-20-91 20:45:36
4 AH11072091190603 07-20-91 19:06:03
5 AH11072191221811 07-21-91 22:18:11
6 AH11072191203347 07-21-91 20:33:47
7 AH11072291220543 07-22-91 22:05:43
8 AH11072291184349 07-22-91 18:43:49
9 AH11072391183303 07-23-91 18:33:03
10 AH11072291202215 07-22-91 20:22:15
11 AH11072491182215 07-24-91 18:22:15
12 AH11072391201049 07-23-91 20:10:49
13 AH11072391215336 07-23-91 21:53:36
101 AH11072891205425 07-28-91 20:54:25
102 AH11072991204229 07-29-91 20:42:29
103 AH11073091221500 07-30-91 22:15:00
104 AH11073091203055 07-30-91 20:30:55
105 AH11073191201923 07-31-91 20:19:23
106 AH11080191215037 08-01-91 21:50:37
107 AH11080191200754 08-01-91 20:07:54
14 1 AH11080291213828 08-02-91 21:38:28
2 AH11080291195640 08-02-91 19:56:40
3 AH11080391212635 08-03-91 21:26:35
4 AH11080491193400 08-04-91 19:34:00
5 AH11080591192250 08-05-91 19:22:50
6 AH11080691205115 08-06-91 20:51:15
7 AH11080691191124 08-06-91 19:11:24
8 AH11080791222408 08-07-91 22:24:08
9 AH11080791190030 08-07-91 19:00:30
10 AH11080891184923 08-08-91 18:49:23
101 AH11080991215932 08-09-91 21:59:32
102 AH11081091200452 08-10-91 20:04:52
103 AH11081191213522 08-11-91 21:35:22
104 AH11081191195337 08-11-91 19:53:37
105 AH11081291180606 08-12-91 18:06:06
106 AH11081391211134 08-13-91 21:11:34
107 AH11081491205942 08-14-91 20:59:42
108 AH11081491191944 08-14-91 19:19:44
109 AH11081591223325 08-15-91 22:33:25
15 1 AH11081691185724 08-16-91 18:57:24
2 AH11081791202443 08-17-91 20:24:43
3 AH11081891201310 08-18-91 20:13:10
4 AH11081991214401 08-19-91 21:44:01
5 AH11081991200154 08-19-91 20:01:54
6 AH11081891215558 08-18-91 21:55:58
7 AH11082091213158 08-20-91 21:31:58
8 AH11082091195032 08-20-91 19:50:32
9 AH11082191193918 08-21-91 19:39:18
10 AH11082191212004 08-21-91 21:20:04
101 AH11082491190531 08-24-91 19:05:31
102 AH11082591203311 08-25-91 20:33:11
103 AH11082591221716 08-25-91 22:17:16
104 AH11082591185437 08-25-91 18:54:37
105 AH11082691202138 08-26-91 20:21:38
106 AH11082691184329 08-26-91 18:43:29
107 AH11082791201004 08-27-91 20:10:04
108 AH11082791183236 08-27-91 18:32:36
109 AH11082891214037 08-28-91 21:40:37
110 AH11082991212841 08-29-91 21:28:41
111 AH11082991194719 08-29-91 19:47:19
112 AH11082991181057 08-29-91 18:10:57
16 1 AH11090191223855 09-01-91 22:38:55
2 AH11083091193605 08-30-91 19:36:05
3 AH11083091211647 08-30-91 21:16:47
4 AH11083191210454 08-31-91 21:04:54
5 AH11090191191326 09-01-91 19:13:26
6 AH11090291190231 09-02-91 19:02:31
7 AH11083191192453 08-31-91 19:24:53
8 AH11090391202952 09-03-91 20:29:52
9 AH11090391221338 09-03-91 22:13:38
10 AH11090491201810 09-04-91 20:18:10
11 AH11090491220116 09-04-91 22:01:16
12 AH11090591214902 09-05-91 21:49:02
13 AH11090591200652 09-05-91 20:06:52
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