--- a/client/src/fairway/Fairwayprofile.vue	Thu Oct 25 15:01:59 2018 +0200
+++ b/client/src/fairway/Fairwayprofile.vue	Thu Oct 25 16:19:46 2018 +0200
@@ -3,7 +3,7 @@
         <div class="fairwayprofile"></div>
         <div class="additionalsurveys d-flex flex-column">
             <small class="label">Available Additional Surveys</small>
-            <select v-model="additionalSurvey" @change="selectAdditionalSurveyData">
+            <select v-model="additionalSurvey">
                 <option value="">None</option>
                 <option
                     v-for="survey in additionalSurveys"
@@ -107,6 +107,15 @@
       "waterLevels",
       "selectedWaterLevel"
     ]),
+    additionalSurvey: {
+      get() {
+        return this.$store.getters["fairwayprofile/additionalSurvey"];
+      },
+      set(value) {
+        this.$store.commit("fairwayprofile/setAdditionalSurvey", value);
+        this.selectAdditionalSurveyData();
+      }
+    },
     currentData() {
       const currentSurveyDate = this.selectedMorph.date_info;
       return this.currentProfile[currentSurveyDate];
@@ -123,7 +132,6 @@
   },
   data() {
     return {
-      additionalSurvey: "",
       wait: false
     };
   },

--- a/client/src/fairway/store.js	Thu Oct 25 15:01:59 2018 +0200
+++ b/client/src/fairway/store.js	Thu Oct 25 16:19:46 2018 +0200
@@ -24,6 +24,7 @@
 const FairwayProfile = {
   namespaced: true,
   state: {
+    additionalSurvey: "",
     availableSurveys: null,
     totalLength: 0,
     minAlt: 0,
@@ -39,9 +40,15 @@
   getters: {
     length: state => {
       return state.totalLength;
+    },
+    additionalSurvey: state => {
+      return state.additionalSurvey;
     }
   },
   mutations: {
+    setAdditionalSurvey: (state, additionalSurvey) => {
+      state.additionalSurvey = additionalSurvey;
+    },
     setSelectedMorph: (state, selectedMorph) => {
       state.selectedMorph = selectedMorph;
     },
@@ -63,9 +70,15 @@
       // Use Vue.set() to make new object properties rective
       // https://vuejs.org/v2/guide/reactivity.html#Change-Detection-Caveats
       Vue.set(state.currentProfile, surveyDate, result.points);
-      state.minAlt = result.minAlt;
-      state.maxAlt = result.maxAlt;
-      state.totalLength = result.lengthPolyLine;
+      if (!state.minAlt || state.minAlt > result.minAlt) {
+        state.minAlt = result.minAlt;
+      }
+      if (!state.maxAlt || state.maxAlt < result.maxAlt) {
+        state.maxAlt = result.maxAlt;
+      }
+      if (!state.totalLength || state.totalLength < result.totalLength) {
+        state.totalLength = result.lengthPolyLine;
+      }
     },
     setStartPoint: (state, start) => {
       state.startPoint = start;
@@ -77,6 +90,7 @@
       state.fairwayCoordinates = coordinates;
     },
     clearCurrentProfile: state => {
+      state.additionalSurvey = "";
       state.currentProfile = {};
     }
   },

--- a/client/src/map/Maplayer.vue	Thu Oct 25 15:01:59 2018 +0200
+++ b/client/src/map/Maplayer.vue	Thu Oct 25 16:19:46 2018 +0200
@@ -164,6 +164,7 @@
       // TODO an improvement could be to check if the line intersects
       // with the bottleneck area's polygon before trying the server request
       if (this.selectedMorph) {
+        this.$store.commit("fairwayprofile/clearCurrentProfile");
         console.log("requesting profile for", this.selectedMorph);
         const inputLineString = event.feature.getGeometry().clone();
         inputLineString.transform("EPSG:3857", "EPSG:4326");