[OpenLayers-Users] Google + WMS = misalign

[Barend Köbben]

Hi Gregor,

Glad yo hear you have a work-around for your problem. I'd consider it a
workaround though, as long as you do not have not really found the reason
for the error. 

> Comerc and Catastro are different servers; if their 23031 aligns
> properly to ours, that's enough to convince me that they're correct.
Excuse me, but that's stupid: if two people say 2+2=5 it doesn't make it
right. Besides, the error is in teh REprojection of 23031 to 9009l3, NOT in
the 23031 projection itself, that certainly could be OK...

Barend


On 08-01-10 21:58, "Gregor at HostGIS" <gregor at hostgis.com> wrote:

>>> The two basemaps are from someone else's server in EPSG:23031, and the
>>> two overlays are from two more servers, one of them (Comerc) being our
>>> own. Nice alignment, indicating that our definition for 23031 must be right.
>> No, it doesn't prove that. It only shows that the transform from the other
>> servers' projection  (23031) to yours is correct. And isn't your comerc
>> server also in 23031? So no reprojection needed?
> 
> Comerc and Catastro are different servers; if their 23031 aligns
> properly to ours, that's enough to convince me that they're correct.
> 
> But, I was given a solution by one of the client's other contacts, and
> is it neat although slightly complex and a bit odd, and now it overlays:
> http://eixos.planol.info/google/
> 
> The original solution was adapted from here:
>http://delta.icc.es/ideLocal/IdecServ?codi=181609&tipus=L&schema=tempc
> 
> It seems to use elements that are not 100% kosher by OL's modern
> standards. It declares the map's projection as EPSG:4326, modifies
> OpenLayers.Layer.WMS to reproject the coordinates in the URL, and
> doesn't use sphericalMercator but does use reproject:true. A weird set
> of hacks, but apparently very effective.
> 
> --
> HostGIS, Open Source solutions for the global GIS community
> Greg Allensworth - SysAdmin, Programmer, GIS Person, Security
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Faculty of Geo-Information Science and Earth Observation (ITC)
University of Twente

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