I have the ASTER version 2 DEM of Cambodia. I want to use it to create 1m contours of Phnom Penh, Cambodia. If anyone has this already please let me know. Now, onto the problems:
- I am using ArcGIS so do not have advanced raster processing tools at my disposal such as ER Mapper
- The ASTER DEM seems very noisy in Phnom Penh, using the contour tool in ArcGIS simply creates lots of contours around what looks like a field of knolls
- Using the focal statistics tool, even with filter sizes up to 30m, does not appear to fix the problem.
- I am comparing the output to 10 and 20m contour lines digitised from a topo map. These lines sweep across the city like contour lines should. They are in no way mimicked by the contour lines I have so far been able to generate from the ASTER DEM.
Does anyone have any advice for generating contours from the ASTER raster?