emxsys/download_SRTMv4.md

## download_SRTMv4.md

      
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              download_SRTMv4.md
            
          
    How to bulk download SRTMv4 from CGAIR-CSI with WGET

The SRTM digital elevation data provided on CGIAR-CSI has been processed to fill data voids
and to facilitate its ease of use by a wide group of potential users. This data is provided
in an effort to promote the use of geospatial science and applications for sustainable
development and resource conservation in the developing world. Digital elevation models (DEM)
for the entire globe, covering all of the countries of the world, are available for download
at CGIAR-CSI.
Step 1. Get a bulk download link from CGIAR-CSI

Request Bulk Download from the
CGIAR-CSI SRTM 90m Digital Elevation Database v4.1 web page.
In a subsequent email from CGIAR-CSI, visit the "one big package file with all the tiles (27 GB)" Google Drive link.
Step 2. Get the ID of the file to download

Get a shareable link from Google Drive by right-clicking the SRTMv4.zip file and selecting Get Shareable Link.
Examine the link to get the file's ID. Example:
https://docs.google.com/open?id=[ID]
Step 3. Download the file with WGET

Build a download URL using the ID obtained in Step 2. Example:
https://drive.google.com/uc?export=download&id=[ID]
Run WGET with the URL. Usage: wget [OPTION]... [URL].... Example:
wget -O [filename] --no-check-certificate -r 'https://drive.google.com/uc?export=download&id=[ID]'
Options used:
-O, --output-document=FILE  writes document to FILE
--no-check-certificate      don't validate the server's certificate
-r                          recursive