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How to manage thousands of DEM and hydrology analysis

Question asked by leeht on Jun 4, 2018

Need to analyze watershed with 1000 DEMs. Is there any way I don't need to physical merge them all together and still can do all kind of hydro analysis?

merged 1000 DEM raster will be huge one. It will take lots of hard drive space, and even worse is that it will take most of memory to read, process the merged data. machine will be extremely slow. It will be fanatic if there is a way to process dem once a tile, but have a result for the whole watershed. Thank you.  hydro dem