I would not think interpolation would be that much easier than a creating a TIN. I have not looked at the dataset though, so it might be "pre-interpolated" (pro

I would not think interpolation would be that much easier than a creating a TIN. I have not looked at the dataset though, so it might be "pre-interpolated" (probably using a TIN if I had to guess), in which case this would be pretty easy with something like pyqgis on a flask server or whatever. The entire api could basically just be: @app.route("/elevation") def elevation(): fileName = "/path/to/raster/srtmRaster.tif" fileInfo = QFileInfo(fileName) baseName = fileInfo.baseName() srtmRaster = QgsRasterLayer(fileName, baseName) res, ident = srtmRaster.identify(QgsPoint(request.form['lat'], request.form['lon'])) return ident[0] I can test this out and throw it on github with some polish if anyone is interested.