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Digital elevation models (DEMs) and height measurements are broadly used in environmental studies. Two common elevationsources are the Ice Cloud and land elevation Satellite (ICESat), which acquired laser range measurements with the Geoscience LaserAltimeter System (GLAS) across the globe and elevation data from the Shuttle Radar Topography Mission (SRTM). Currentdevelopments of small unmanned aerial vehicles (UAV) provide the opportunity to collect aerial images of remote areas at a highspatial resolution. These can be further processed to digital surface models by stereophotogrammetry and provide a reliable datasource to evaluate coarse scale Digital Elevation Models (DEMs).  This study compares ICESat/GLAS and SRTM90 elevation data against photogrammetric terrain heights within GLAS footprints onhigh altitudes on the East Tibetan Plateau. Without vegetation-bias, we were able to examine height differences under differenttopographic conditions and of different acquisition dates. Several resampling techniques were applied to SRTM90 data and averagedheight within each footprint was calculated. ICESat/GLAS heights (n = 148) are most similar to UAV data based elevations with anaveraged difference of −0.8m ±3.1m. Results furthermore indicate the validity of ICESat/GLAS heights, which are usually removedfrom analyses by applying different quality flags. Smallest difference of SRTM90 to UAV based heights could be observed by anatural neighbour resampling technique (averaged 3.6m ±14m), whereat other techniques achieved quite similar results. It can beconfirmed that within a range of 3,800–4,200m above mean sea level the ICESat/GLAS heights are a precise source to determineelevation at footprint geolocation

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

COMPARING ICESAT/GLAS BASED ELEVATION HEIGHTS WITH PHOTOGRAMMETRIC TERRAIN HEIGHTS FROM UAV-IMAGERY ON THE EAST TIBETAN PLATEAU