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

[Eric Lemoine]

On Wed, May 28, 2008 at 10:06 PM, Eric Lemoine <eric.c2c at gmail.com> wrote:
> 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)

http://nsidc.org/data/atlas/epsg_32661.html gives differing
information so I'm confused.

--
Eric