Рубрики:
WESTERN SAYANI MOUNTAINS
INTERFEROMETRIC RADAR
TROPICAL FOREST
SAR DATA
LIDAR
VEGETATION
GEOLOCATION
RETURNS
SIBERIA
Кл.слова (ненормированные):
shuttle radar topography mission (SRTM) -- shuttle laser altimeter (SLA) -- interferometric SAR -- DEM -- lidar waveform -- tree height
WESTERN SAYANI MOUNTAINS
INTERFEROMETRIC RADAR
TROPICAL FOREST
SAR DATA
LIDAR
VEGETATION
GEOLOCATION
RETURNS
SIBERIA
Кл.слова (ненормированные):
shuttle radar topography mission (SRTM) -- shuttle laser altimeter (SLA) -- interferometric SAR -- DEM -- lidar waveform -- tree height
Аннотация: Spaceborne Interferometric SAR (InSAR) technology used in the Shuttle Radar Topography Mission (SRTM) and spaceborne lidar such as Shuttle Laser Altimeter-02 (SLA-02) are two promising technologies for providing global scale digital elevation models (DEMs). Each type of these systems has limitations that affect the accuracy or extent of coverage. These systems are complementary in developing DEM data. In this study, surface height measured independently by SRTM and SLA-02 was cross-validated. SLA data was first verified by field observations, and examinations of individual lidar waveforms. The geolocation accuracy of the SLA height data sets was examined by checking the correlation between the SLA surface height with SRTM height at 90 in resolution, while shifting the SLA ground track within its specified horizontal errors. It was found that the heights from the two instruments were highly correlated along the SLA ground track, and shifting the positions did not improve the correlation significantly. Absolute surface heights from SRTM and SLA referenced to the same horizontal and vertical datum (World Geodetic System (WGS) 84 Ellipsoid) were compared. The effects of forest cover and surface slope on the height difference were also examined. After removing the forest effect on SRTM height, the mean height difference with SLA-02 was near zero. It can be further inferred from the standard deviation of the height differences that the absolute accuracy of SRTM height at low vegetation area is better than the SRTM mission specifications (16 in). The SRTM height bias caused by forest cover needs to be further examined using future spaceborne lidar (e.g. GLAS) data. (C) 2003 Elsevier Inc. All rights reserved.
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Scopus
Держатели документа:
Univ Maryland, Dept Geog, College Pk, MD 20742 USA
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
VN Sukachev Inst Forest, Krasnoyarsk, Russia
Sci Syst & Applicat Inc, Lanham, MD 20706 USA
Доп.точки доступа:
Sun, G...; Ranson, K.J.; Khairuk, V.I.; Kovacs, K...