The aerotriangulated heights, including all the heights have been merged with the aerophotogrammetric DEM and used to generate a Digital Elevation Model (DEM) with a resolution of 1 m. The aero- DEM is available at ICESat and DTU/SDFE.
The aero- DEM can be used as a standalone surface to be compared with other DEMs such as SRTM and ASTER. The aero- DEM can also be combined with other data, such as SRTM, and in this case, the aero- DEM would be used as the common base for elevation extraction. The ICESat DEM is a surface that can be used to extract the heights of ICESat’s ice core sites in Iceland.
The aero-triangulation was carried out with 6.5 m gap strips (on a 10 m size) in a stratified grid of 100 m. Coarse height control has been used to ensure matching of heights by means of a fixed amount of height difference, dz. The size of dz was chosen to ensure a representative input height, even in heterogeneous areas such as forests and water bodies. The vertical accuracy of the aero-triangulation is estimated to be better than 10 cm for areas with similar heights.
Icelands heights were determined using a combination of the aerotriangulated topographic surface and the ICESat height. The best match is obtained for the coastal area, where the height differences of the aero-triangulated height and satellite height are below 30 cm. A difference of 40 cm may be ascribed to a systematic offset introduced by the difference of the topographic surface and the aerotriangulated surface. However, the spatial coverage of the triangulated height is limited to the coastline, where surface topography is relatively homogeneous.
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