Issue #132: Done.

src/components/Discover/Map/Filter/Trace.vue

@@ -132,6 +132,12 @@ export default {
       };
     }
   },
+  watch: {
+    selectArea: function(newValue) {
+      let roundValue = Math.round(newValue[1].toFixed());
+      if(newValue[1] !== roundValue) this.selectArea[1] = roundValue;
+    }
+  },
   methods: {
     /**
      * Set bar chart Options