The processes of working with digital elevation models (DEMs) and watershed delineation are in constant change over time. Even though the elevation datasets date from 10 years ago; the web servers and tools for data processing have changed in recent years. With online tools such as Hatari Utils, the watershed delineation can be performed in a few steps with practical outputs as vector files and watershed statistics.

This tutorial covers the whole process of defining an area of interest in QGIS, export it to NASA Earthdata Search, review the elevation datasets available, download multiple elevation rasters, join rasters and clip to the area of interest and delineate the watershed online.

Nasa Earthdata link:

search.earthdata.nasa.gov/search

Hatari Utils link:

utils.hatarilabs.com