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3

I think you will struggle to find those regional shapefiles. But when i've needed country wide shapefiles, i tend to use Natural Earth: http://www.naturalearthdata.com/downloads/10m-cultural-vectors/ In your case, i would download the "Admin 0 - Countries" file. If you then open this shapefile into, let's say QGIS or ArcMap, open the attributes table and ...


3

r.sim.sediment is a tool from the GRASS toolbox. You can find documentation for GRASS tools by clicking the "Help" link in the QGIS tool dialog for that tool, or go straight here: https://grass.osgeo.org/grass64/manuals/r.sim.sediment.html It shows that you need a few raster data sets over your study area, including elevation, water depth and so on. If ...


2

There are lots of places to download GIS data and imagery around the web but they can be tricky to find. Earth Explorer is a good option that searches by location, time, and data set, giving you access to lots of imagery for free. This includes imagery from NAIP / NAPP, which is probably the most applicable to your project. https://earthexplorer.usgs.gov/ ...


1

You may want to check out the relatively new MERIT-DEM, which is mostly SRTM but heavily corrected (especially north of 60 degrees). You can download it in tiles. They also have corresponding hydrologic models (MERIT-Hydro) that include flow directions, flow accumulations, channel widths, height above nearest drainage, and a depression-filled DEM. All global....


1

You can download a 90-m resolution DEM from http://srtm.csi.cgiar.org/download. It covers both Uruguay and all of South America.


1

There is the Open-Elevation API (https://open-elevation.com/) that looks promising see https://github.com/Jorl17/open-elevation/blob/master/docs/api.md for API examples Live API sample: https://api.open-elevation.com/api/v1/lookup?locations=41.161758,-8.583933


1

For those continuing to search (I was and landed here). There is a free USGS service which is well buried. Link here. Worked for my use case of a couple of dozen points. HT to @barrycarter for the index link.


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