Author/Authors :
Zhao، نويسنده , , Feng and Yang، نويسنده , , Xiaoyuan and Strahler، نويسنده , , Alan H. and Schaaf، نويسنده , , Crystal L. and Yao، نويسنده , , Tian and Wang، نويسنده , , Zhuosen and Romلn، نويسنده , , Miguel O. and Woodcock، نويسنده , , Curtis E. and Ni-Meister، نويسنده , , Wenge and Jupp، نويسنده , , David L.B. and Lovell، نويسنده , , Jenny L. and Culvenor، نويسنده , , Darius S. and Newnham، نويسنده , , Glenn J. and Tang، نويسنده , , Hao and Dubayah، نويسنده , , Ralph O.، نويسنده ,
Abstract :
Foliage profiles retrieved from a scanning, terrestrial, near-infrared (1064 nm), full-waveform lidar, the Echidna Validation Instrument (EVI), agree well with those obtained from an airborne, near-infrared, full-waveform, large footprint lidar, the Lidar Vegetation Imaging Sensor (LVIS). We conducted trials at 5 plots within a conifer stand at Sierra National Forest in August, 2008. Foliage profiles retrieved from these two lidar systems are closely correlated (e.g., r = 0.987 at 100 m horizontal distances) at large spatial coverage while they differ significantly at small spatial coverage, indicating the apparent scanning perspective effect on foliage profile retrievals. Also we noted the obvious effects of local topography on foliage profile retrievals, particularly on the topmost height retrievals. With a fine spatial resolution and a small beam size, terrestrial lidar systems complement the strengths of the airborne lidars by making a detailed characterization of the crowns from a small field site, and thereby serving as a validation tool and providing localized tuning information for future airborne and spaceborne lidar missions.
Keywords :
Foliage profile , Airborne full-waveform lidar system , EVI , LVIS , Ground-based full-waveform lidar
