How to prevent vector layer zooming if base layer does not allow farther zoom

Question

I am using different types of base layer in OpenLayers and drawing vector layers on them. I am having trouble with Google satellite base layers.

I have noticed that satellite view has different zoom levels in different places. In some places base layer is not zooming but vector layer is zooming.

How can I determine if farther zoom level is available for a certain base layer?

In the images bellow a corner is marked with red. Notice the change position of the vector layer

Vector at zoom level 19

Same vector at zoom level 20

Answer 1

One thing you can do if you have base layers with different resolutions is to detect for the layer in the changebaselayer callback and then reset the map's resolutions array, and redraw the panzoombar control, so it can only zoom to the new base layer's resolutions.

map.events.register("changebaselayer", this, function (obj) {
    if (obj.layer.name == 'your_layer_name') {
        map.baseLayer.resolutions = [20, 10, 5];
        map.baseLayer.numZoomLevels = 3;
        map.baseLayer.fractionalZoom = false;
        map.baseLayer.maxResolution = 20;
        map.baseLayer.minResolution = 5;
        map.zoomTo(2, map.getCenter());
        panzoombar.redraw();
    }
});

In other words, you need to have different resolutions arrays if you are using layer with different allowed resolutions. These should be preloaded at design time, as you can't easily detect if a particular layer allows a certain zoom from the client.