[OpenLayers-Users] Lots of spurious tiles get loaded when changing base layer

[Eric Lemoine]

On Tue, May 27, 2008 at 2:42 PM, Jon Blower <jdb at mail.nerc-essc.ac.uk> wrote:
> Hi,
>
> I have an OL2.6 application that uses base layers in different map
> projections.  The map is initially constructed with a base layer in
> lat-lon (EPSG:4326).  If I change the base layer to a layer in polar
> stereographic projection (EPSG:32661) the map loads a whole load (up
> to 40) of spurious tiles.  This effect can be seen by loading the
> attached example web page and using Firebug (or similar) to examine
> the outgoing GetMap requests.  The spurious tiles have a bounding box
> that is inappropriate for the current zoom level and map extent (this
> shows up clearly because the extents for 4326 and 32661 are very
> different in their native units).
>
> Registering an event listener for changebaselayer does not help: it
> seems that the spurious tiles are loaded anyway.

Based on http://spatialreference.org/ref/epsg/32661/ the bounds for
32661 are -180.0 60.0 180.0 90.0 so I don't understand the values
you're using. (That might not explain the spurious tiles you're seeing
though)

--
Eric