[OpenLayers-Users] Shifting a layer

[Tyler Erickson]

I would rather see the image providers improve their image registration, 
rather than focusing on how to manage the misregistration on the client 
side.  Perhaps there is a need for an 'OpenGeoreferencing.org' site, 
where users could submit ground control points for features in their 
local vicinity.  If the data tile providers see that their image 
registration efforts could be improved and are provided the gcp data to 
do so, perhaps they would fix the registration issues.

just a thought...

Cranio wrote:
> Tyler, that seems really a bad issue. Even if the functionality of the map is
> not
> affected by this shift, it's really annoying having that shift at a close
> zoom of
> an area.
> Many have told me that it's impossible to put anywhere an offset to
> compensate
> the shift. I thought I could tamper with the Google projection defiinition
> (ESPG:900913)
> in the "espg" file, but I really don't know how and if it is possible.
>
> Thanks a lot for your (and other) answers.
>
>
> Tyler Erickson wrote:
>   
>> In my neck of the woods, the current imagery displayed by Google Maps 
>> and Google Earth imagery are shifted about 10-20m to the east.  You can 
>> see this when you compare the Google Maps streets data to the satellite 
>> view (see the following URL).  I have noticed the same thing when 
>> uploading GPS data that I collected on the local trails that are visible 
>> in the imagery.
>> So its possible that is nothing wrong with your WMS layers, but it is 
>> that the Google Maps imagery in your area is not precisely registered...
>>
>>     
>
>   


-- 
Tyler A. Erickson, Ph.D.
Research Scientist
Michigan Tech Research Institute
3600 Green Court, Suite 100
Ann Arbor, MI 48105
tyler.erickson at mtu.edu
www.mtri.org
www.michiganview.org

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