Added api enpoint to retrieve altitude at coordinates

client/routes/api/elevation.js

@@ -0,0 +1,18 @@
+const express = require('express');
+const router = express.Router();
+const TileSet = require('srtm-elevation').TileSet;
+
+const tileset = new TileSet('./data/');
+
+router.get( "/:lat/:lng", ( req, res ) => {
+    tileset.getElevation([req.params.lat, req.params.lng], function(err, elevation) {
+        if (err) {
+            console.log('getElevation failed: ' + err.message);
+        } else {
+            res.send(String(elevation));
+        }
+    });
+    
+});
+
+module.exports = router;