Add bar height scaling when zooming in map

src/PointMap.js

@@ -317,7 +317,12 @@ class PointMap extends Component {
         },
         filled: true,
         extruded: true,
-        getElevation: d => d.get_avg_traffic_vol() * 20,
+        getElevation: d => {
+          let zoom = this.state.viewport.zoom;
+          // super hacky way of scaling the bar height
+          let vol_scale = 20 * (1.5 ** 6);
+          return d.get_avg_traffic_vol() * vol_scale / (1.5 ** zoom);
+        },
         getLineColor: d => {
           if (this.state.mouseover === d.get_id()) {
             return [255, 0, 0];