<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ritchie, Jerry C</style></author><author><style face="normal" font="default" size="100%">Seyfried, Mark S.</style></author><author><style face="normal" font="default" size="100%">Chopping, Mark J.</style></author><author><style face="normal" font="default" size="100%">Pachepsky, Yakov</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Airborne laser technology for measuring rangeland condition</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">SEV</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year></dates><publisher><style face="normal" font="default" size="100%">na</style></publisher><volume><style face="normal" font="default" size="100%">54</style></volume><pages><style face="normal" font="default" size="100%">A8-A21</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER.2001-63196</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Pachepsky, Yakov</style></author><author><style face="normal" font="default" size="100%">Ritchie, Jerry C</style></author><author><style face="normal" font="default" size="100%">Gimenex, Daniel</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Fractal modeling of airborne laser altimetry data</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">JRN</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1997</style></year></dates><volume><style face="normal" font="default" size="100%">61</style></volume><pages><style face="normal" font="default" size="100%">150-161</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Airborne laser altimetry is a remote sensing technique that can provide high resolution data on the roughness of the landscape both for estimating water balance components and for distinguishing between landscapes.  Models of the scale-dependent roughness are needed to find scales most appropriate for these purposes.  Our objectives were to apply fractal scaling to high-resolution profiling laser altimetry data and to determine fractal parameters fro differentiating land cover.  Data were collected at the USDA-ARS Jornada Experimental Range in New Mexico over grass-dominated and shrub-dominated sites along four transects at each site.  Scale-dependent root-mean-square (RMS) roughness and data power spectrums were computed from 100,000 data points (~2 km) from each transect.  A linearity measure and piecewise linear approximation were applied to find intervals of the fractal scaling.  The RMS roughness data had two intervals of self-affine fractal scaling on grass transects and four such intervals on shrub transects.  Reduction in the number of data points did not lead to a decrease in roughness but caused a smoothing dependency of fractal dimension on scale. Ten- and hundred-meter scales were appropriate for distinguishing between grass and shrub transects on the basis of fractal dimensions.  Published by Elsevier Science Inc.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.1997-91343</style></accession-num></record></records></xml>