I use SRTM 30m images for hidrological studies in general, but now I need more detailed images to use HEC-RAS 5.0 to prepare flood maps. It seems LIDAR is not an option in sub-saharian countries. Is there any better images than SENTINEL2 10m?
If You need a DEM for flood simulation via HEC-RAS 5, I suggest you to download ALOS-30m DEM... Based on my experiences this dataset is more better and reliable than other remote sensing based DEMs such as STRM or ASTER DEMs. In the attached file you can learn how to access to the ALOS DEMs.
Thanks for you tip. What I really need are high resolution DEMs and not images. But 30 m is not good enough. I have those. I need 5 m or less resolution.