Keeping zoom / position of the map after updateData()

The idea is to update map's default zoom setting in your dataProvider every time zoom/pan event occurs:

map.addListener("zoomCompleted", function (event) {
  map.dataProvider.zoomLevel = map.zoomLevel();
  map.dataProvider.zoomLongitude = map.zoomLongitude();
  map.dataProvider.zoomLatitude = map.zoomLatitude();
});