Indonesian DEMNAS: DSM or DTM?

DEMNAS is a combination of multi DEM from TerraSAR-X, IFSAR, ALOS PALSAR, and mass point. It has a spatial resolution 8 m. The problem that arises now is whether the DEMNAS is in the form of DSM or DTM. This study aims to obtain information related to whether the DEMNAS is in the form of DSM or DTM. This research involved data from DSM LIDAR, DTM LIDAR, and DSM SRTM to see comparisons with DEMNAS in the South Kalimantan region. In addition, it also examines the comparison of DEMNAS with DSM IFSAR, DTM IFSAR, and DSM SRTM in the Central Java region. The way that is done is that all these DEMs are equated with height reference fields to EGM2008. The next process is to extract height points on the polygons created in each DEM used in this study. After that, it is done profiller in the form of making a height profile pattern for each DEM. The results obtained were in the form of known DEM that had height errors, height differences in reference fields, and the form of DEMNAS. The form of DEMNAS in the South Kalimantan region is dominated by DSM rather than the DTM. In the Central Java region, the form of DEMNAS is not in the form of DSM and DTM. The use of DEMNAS for certain applications should be considered in the form of DEM whether in the form of DSM, DTM, or not both of them.