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<br />I <br /> <br />1505 <br /> <br />I <br /> <br />I <br /> <br /> <br />UtAl1 <br /> <br />RM 0 Study Are <br /> <br />I <br /> <br /> <br />. j <br /> I/- <br /> ! <br /> -( .:'~30S <br /> ",oJ/- <br /> " <br /> '" <br /> " <br />,,,," '," <br /> . <br /> , <br />~ .. <br /> !> - <br /> I'~ <br /> I <br /> Miles <br /> 0 10 20 30 40 <br />,.~. , , <br />- o 510 20 30 40 N <br /> .. A <br /> - StateBolJltlary Kilometers <br /> <br /> <br />'.~..... <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br /> <br />I <br /> <br />Figure I. lode\. map (,rthe: Colorado RI\o:r in the (ir.md Can~('n sh<min~ locations ofsluJ~ an:a.~ used 10 naluale U()AR. <br /> <br />I <br /> <br />LlDAR I>ata Collection <br /> <br />L1DAR data "ere acquired over the Grand Canyon during three ~eparate mi~ions in the Spring. <br />and Fall or:?Ooo. The Acroscan ALMS sem,or (operated by Earthdala. ~larylandJ"as used to collect <br />L1DAR dala in late March. ALMS is a bi-dircctional. oscillating mirror system thai operates at 1.064 ,.lIn <br />\\3velength. Data "ere colk-tled a1 a Ilight altitude of3.0~8 m. with a pulse tale of 15 I.;Hz. and a scan <br />rate of 13 IIz. This collection provided a swath width of 1.350 m. an average spot spacing of 3.75 m. and <br />an 3\'erage spot diameter of I m. The RAMS (Remote Airborne Mapping Syslem. Ene-rque-sl. Colorado) <br />sensor ""as used to collC'Ct L1DAR data in late August and in mid-September 2000. RAMS is also a bi- <br />direcliona]. oscillaling mirror system thaI ope-rates at 1.064 f.lm ""a....e]ength. using a pulse rale of 15Khz. <br />A maximum of 5 relums could I:'IC' captured for a single pulse. "" ilh mulliple returns indicating canopy <br />returns and the la..t re-turn indicaling. at best. the elevation of bare ground. The RAMS tlighl altitude was <br />aboul 1.900 m. \\hich produced a swath width of about 130 m. an average spot spacing of 1.5 m. and a <br />spot diameter of about 0.5 m. Both the AL~1S and RAMS L1DAR data used dual-frequency GPS (G]obal <br />Positioning System) and] MU (Inenial ~feasuremcnt Unil) infonnation to determine the position and <br />elevation of each data point. All L1DAR ele\ation data ""ere delivered as onhomelric heights (NVG[):!9. <br />Geoid99) in melers above sea ]evel (ASL). <br /> <br />. <br />" <br />