smaller tiles and only allow offline caching downloading together with map tiles

src/QtLocationPlugin/QGCMapEngine.cpp

@@ -112,7 +112,7 @@ getQGCMapEngine()
 }
 
 //-----------------------------------------------------------------------------
-const double QGCMapEngine::srtm1TileSize = 0.025;
+const double QGCMapEngine::srtm1TileSize = 0.01;
 
 //-----------------------------------------------------------------------------
 void
@@ -393,9 +393,6 @@ QGCMapEngine::getMapNameList()
             mapList << kEsriTypes[i].name;
         }
     }
-    for(size_t i = 0; i < NUM_ELEVMAPS; i++) {
-        mapList << kElevationTypes[i].name;
-    }
     return mapList;
 }
 

src/QtLocationPlugin/QGCMapUrlEngine.cpp

@@ -552,7 +552,7 @@ UrlFactory::_tryCorrectGoogleVersions(QNetworkAccessManager* networkManager)
 #define AVERAGE_MAPBOX_SAT_MAP      15739
 #define AVERAGE_MAPBOX_STREET_MAP   5648
 #define AVERAGE_TILE_SIZE           13652
-#define AVERAGE_AIRMAP_ELEV_SIZE    34000
+#define AVERAGE_AIRMAP_ELEV_SIZE    5360
 
 //-----------------------------------------------------------------------------
 quint32

src/QtLocationPlugin/QMLControl/OfflineMap.qml

@@ -433,7 +433,7 @@ QGCView {
                     Row {
                         spacing:    ScreenTools.defaultFontPixelWidth
                         anchors.horizontalCenter: parent.horizontalCenter
-                        visible:    !_defaultSet
+                        visible:    !_defaultSet && mapType !== "Airmap Elevation Data"
                         QGCLabel {  text: qsTr("Zoom Levels:"); width: infoView._labelWidth; }
                         QGCLabel {  text: offlineMapView._currentSelection ? (offlineMapView._currentSelection.minZoom + " - " + offlineMapView._currentSelection.maxZoom) : ""; horizontalAlignment: Text.AlignRight; width: infoView._valueWidth; }
                     }
@@ -737,8 +737,10 @@ QGCView {
                             anchors.right:  parent.right
                             text:           qsTr("Fetch elevation data")
                             checked:        QGroundControl.mapEngineManager.fetchElevation
-                            onClicked:      QGroundControl.mapEngineManager.fetchElevation = checked
-                            visible:        mapType != "Airmap Elevation Data"
+                            onClicked: {
+                                QGroundControl.mapEngineManager.fetchElevation = checked
+                                handleChanges()
+                            }
                         }
                     }
 

src/QtLocationPlugin/QMLControl/QGCMapEngineManager.cc

@@ -83,6 +83,10 @@ QGCMapEngineManager::updateForCurrentView(double lon0, double lat0, double lon1,
         QGCTileSet set = QGCMapEngine::getTileCount(z, lon0, lat0, lon1, lat1, mapType);
         _totalSet += set;
     }
+    if (_fetchElevation) {
+        QGCTileSet set = QGCMapEngine::getTileCount(1, lon0, lat0, lon1, lat1, UrlFactory::AirmapElevation);
+        _totalSet += set;
+    }
     emit tileX0Changed();
     emit tileX1Changed();
     emit tileY0Changed();

src/TerrainTile.h

@@ -5,8 +5,6 @@
 
 #include <QGeoCoordinate>
 
-#define TERRAIN_TILE_SIZE 91
-
 Q_DECLARE_LOGGING_CATEGORY(TerrainTileLog)
 
 /**