[OpenLayers-Users] Problem with overlays on VE

[Warren Vick]

I've just come back to the problem below and thought I'd dig around with
Chrome's Element Inspector feature. It revealed something interesting
which seems to be the problem. With a VE base map, the tile requested is
at the wrong zoom level. For example, with the Google, Yahoo and OSM
base maps, the overlay tile is:

.../10/506/335.png

But when the VE base map is used, it tries to fetch:

.../9/506/335.png

which is not there.

Since I'm sure the base layers are supposed to be consistent, I now
suspect this to be a bug. 

Regards,
Warren

-----Original Message-----
From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
On Behalf Of Warren Vick
Sent: 15 January 2009 12:46
To: users at openlayers.org
Subject: Re: [OpenLayers-Users] Problem with overlays on VE

Sadly no feedback on this. However, I've made available a demo
illustrating the problem:

http://europa.uk.com/demo/ve_tms_overlay_problem.html

The purple roads overlay is a TMS layer. It sits perfectly over Google,
Yahoo and OSM, but disappears when VE is selected as the base. You can
see image placeholders appear for tiles that don't exist.

Is this a bug in OL or have I done something stupid?!

Regards,
Warren Vick

-----Original Message-----
From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
On Behalf Of Warren Vick
Sent: 06 January 2009 10:43
To: users at openlayers.org
Subject: [OpenLayers-Users] Problem with overlays on VE

I'm having problem with an overlay on a Virtual Earth base. The TMS
overlay has been created with Mapnik/generate_tiles.py in ESPG:900913
and looks fine when placed as a base layer. However, when placed on a VE
base, the overlay disappears. Just to check I wasn't going mad, I used
SphericalMercator.html and found my overlay works fine over Google and
Yahoo maps. It's just the VE base which shows the problem. Any thoughts
on what's different with a VE base?

Regards,
Warren Vick


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