Abstract
Indonesia has various DEM from many sources and various acquisition date spreaded in the past two decades. There are DEM from spaceborne system (Radarsat, TerraSAR-X, ALOS, ASTER-GDEM, SRTM), airborne system (IFSAR, Lidar, aerial photos) and also terrestrial one. The research objective is the quality test and how to extract best DEM in particular area. The method is using differential GPS levelling using geodetic GPS equipment on places which is ensured not changed during past 20 years. The result has shown that DEM from TerraSAR-X and SRTM30 have the best quality (rmse 3.1 m and 3.5 m respectively). Based on this research, it was inferred that these parameters are still positively correlated with the basic concept, namely that the lower and the higher the spatial resolution of a DEM data, the more imprecise the resulting vertical height.
Highlights
1.1 BackgroundMapping of Indonesian Topography (RBI) is one of the main tasks of the Geospatial Information Agency (BIG)
Indonesia conventional topographical mapping using stereo plotting techniques by forming a 3D model of stereopair of aerial photographs or orthorectified radar image (ORRI) and its stereomate formed from the ORRI and Digital Surface Model (DSM)
Vertical precision of SRTM Digital Elevation Model (DEM) depends on the phase noise in radar, while the horizontal resolution depends on the ratio of
Summary
Mapping of Indonesian Topography (RBI) is one of the main tasks of the Geospatial Information Agency (BIG). Along with the development of remote sensing technology, it is available a wide range of data that can be used to obtain elevation data digitally, known as Digital Elevation Model (DEM) Some of this data has been used by BIG in mapping the RBI. Large scale mapping would require DEM data with higher resolution and accuracy level anyway. Indonesia conventional topographical mapping using stereo plotting techniques by forming a 3D model of stereopair of aerial photographs or orthorectified radar image (ORRI) and its stereomate formed from the ORRI and DSM Through this 3D model we creates hypsography elements like mass point, ridge line (break line), and the river's which shape DTM and contour (Li, Zhu, & Gold, 2005). Vertical precision of SRTM DEM depends on the phase noise in radar, while the horizontal resolution depends on the ratio of. If both methods were compared, SAR interferometry is more accurate than radargrammetry, but radargrammetry overcome the weaknesses of interferometry related temporal disconnection as a result of the repeat pass for 11 days (Raggam, 2010)
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