Google maps projections..

[Steve Young]

Thanks Frank,

Upgrading to 4.6.1 fixed my tile problem.

Steve 

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Frank Warmerdam
Sent: Sunday, November 06, 2005 11:52 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] Google maps projections..

On 11/6/05, Steve Young <steve at sierraclub.bc.ca> wrote:
> Google map's projection is Mercator, but uses lat long as units 
> (rather than metres). I think there's something that Mapserver does 
> with bounding boxes that other WMS don't do. I haven't successfully 
> got a WMS overlaid correctly using my mapserver WMSs (3.6.1 and 4.0). 
> I've got close using John Deck's method, but suffer tile alignment 
> issues that don't affect other WMS servers.

Steve,

In the early days (ie. Up MapServer 4.2 or so) MapServer did not honour
non-square pixel requests.  It would basically adjust the extents of
the request to force the pixel size to be square.    This was fixed in
MapServer 4.4 (or perhaps 4.6?)

I don't have anything to add on the Google overlay business.

Best regards,
--
---------------------------------------+--------------------------------
---------------------------------------+------
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent