density should be a parsed as a float

src/App.vue

@@ -73,7 +73,7 @@ export default {
         },
 
         densityUpdate(val) {
-            this.density = val;
+            this.density = Math.round(val * 100) / 100;
         },
 
         formatArea(val) {

src/components/Map.vue

@@ -194,7 +194,7 @@
                     this.surfaceUpdated();
                 }
 
-                this.$emit('densityChange', parseInt(meta[0]));
+                this.$emit('densityChange', parseFloat(meta[0]));
             },
 
             loadLegacyHash(hash) {