createExportAsModelSubmenu doesn't use google maps implementation

frontend-js/src/main/js/gui/ContextMenu.js

@@ -160,13 +160,13 @@ ContextMenu.prototype.createExportAsModelSubmenu = function () {
             polygonString: map.getSelectedPolygon(),
             modelId: map.getActiveSubmapId(),
             handlerClass: converter.handler,
-            backgroundOverlayId: map.getGoogleMap().getMapTypeId(),
-            zoomLevel: map.getGoogleMap().getZoom(),
+            backgroundOverlayId: map.getBackgroundDataOverlay().getId(),
+            zoomLevel: map.getZoom(),
             overlayIds: extractDataOverlayIds(visibleDataOverlays)
           });
         }).then(function (url) {
           return self.downloadFile(url);
-        }).then(null, GuiConnector.alert);
+        }).catch(GuiConnector.alert);
       });
     });
     return submenu;