please could anyone of you dears let me know which type of DEM is better for mapping flood prone areas and why with scientific reason or reference ALOS palsar dem 12.5 m and coperinose GDEM 30 m? really appreciate you kind answers
ALOS palsar DEM: Higher the spatial resolution, Higher the accuracy.
If your study area small then used ALOS PALSAR DEM with 12.5m resolution but for lager study area you can use ASTER GDEM data with 30m resolution.
ALOS PALSAR DEM is better than the ASTER GDEM for this work.
https://asf.alaska.edu/data-sets/derived-data-sets/alos-palsar-rtc/alos-palsar-radiometric-terrain-correction/
https://search.asf.alaska.edu/#/?zoom=3.000¢er=-97.494,39.674
Article Comparison and Validation of Digital Elevation Models Derive...
LIDAR data or UAV data, historical documents and older people experiences/information are useful for mapping flood prone area.
I think that global DTMs should be used for flood modelling and mapping with caution. If you have no other topographic data available then they're better than nothing. However, ideally high resolution LIDAR or other surveyed topographic data should be used. Not only will these sources of topographic data generally have a better spatial resolution than global DTMs but they should also have a better vertical and horizontal accuracy as well.
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