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I am making client-end javascript-powered maps in the context of web development. I am not using gdal, which I gather is a special kind of rendering software.

Data source site: http://www.diva-gis.org/gdata

Previously, I was able to download the shapefile of my country of interest and its administrative regions. Client maps need to be small of course due to data transfer, so I found information on how to convert shapefiles to geojson and then topojson and finally how to simplify. All that worked like a charm.

The troubles began when I looked to find a way to convert/resample .gri files containing elevation data to topojson. Again, this data is from diva-gis. As it stands, the .gri format is not recognizable to my javscript mapping libraries and it's still large in file size.

Question

Is it possible to convert and simplify an elevation data file for a country in .gri format? If so how? If not, is there another convention for obtaining elevation/topographic data in a small-sized topojson?

Software I must use (no gdal)

  • javscript (d3,topojson)
  • node

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