[Gvsig_english] General Question: Adding WMS Server -> choosing the right/best EPSG

[Marcel Schoolmeesters]

Hi Mario,

thank you for the list of EPSG codes :) and the explanation.

Ok, of course, the different added layers must have the same projection. 
I did not use layers from different sources, yet.

So, am I to understand that "Application settings -> View -> SRS" is 
only important to GPS? => the position of gps fits to the map?



Additionally, I thought, DHDN is already supported by gvSIG 
Mobile,...but in the source code of pilot2 (I think thats the newest??) 
ED50 and WGS84 seem to be the implemented datums with their 
corresponding ellipsoids (int_1924 and wgs84) - do I have to implement 
it myself? Could you or anybody else perhaps help me which functions / 
classes have to be changed? elipsoid.java of course, but where are the 
main projecting functions?

I would like to add EPSG:31467, because following WMS seems to be the 
only one, I can open with gvSIG Mobile at the moment:
http://wms1.ccgis.de/cgi-bin/mapserv?map=/data/umn/germany/germany.map&&VERSION=1.1.1&REQUEST=GetCapabilities&SERVICE=WMS


Btw, even the www.idee.es does not work anymore. I cannot understand why 
as I don't have any debug-log of a working connection to the wms server, 
only the non-working (see attachment)
but on 18.03., I still could connect on windows mobile (without debug 
log of course) - the first test with eclipse has been on 19.03. and did 
not work. on windows mobile I even don't get any connection to the (on 
Desktop PC with Eclipse) working German server. (same source code)

The internet connection on the WIndows Mobile Device (Emulator) is 
working, as I have tested the WMS with Internet Explorer, too.

I don't understand the differences and first of all, I don't understand, 
why the Spanish server worked once on Windows Mobile (on 18.03.) but 
afterwards no longer...

I have tested other wms servers, perhaps it might help you to find the 
main problem. I despair of looking for a really working one as it even 
seems to change every day.


Best regards,

Marcel Schoolmeesters


Am 21.03.2011 09:44, schrieb Mario Carrera:
> Hi Marcel,
>
> the SRSs available in a WMS layer are the systems of the area. In the
> case of idee.es, about cartography of Spain, you will have ED50-UTM
> (230xx), ETRS89 -UTM (258xx) and 4326 (WGS84-geographic) among others
> ("xx" will be from 28 to 31, the zones of Spain). They are the most used
> SRSs here.
>
> You can consult the EPSG codes on
> http://www.scanex.com/en/software/scanmagic/SMD_SPC_ENG_SupportedCoordinateSystems.pdf.
>
>
> About the right / best one to select will depend on the other
> cartography that you are using on the same view. For example, if you are
> working with a GPS in WGS84-geographic, you can load the WMS layer in
> 4326 if you don't want to reproject the GPS points.
>
> Best regards,
>       Mario
>
>
>
> Marcel Schoolmeesters escribió:
>> Hey,
>>
>> anybody who can help me with choosing the right EPSG?
>>
>> I know there are different EPSG, each for different coordinate system
>> and projection. But when many SRS are selectable, which is the right /
>> best one? and what's the reason for choosing it? e.g. the gvSIG Mobile
>> Default WMS:
>> http://www.idee.es/wms/PNOA/PNOA?Request=GetCapabilities&Service=WMS ...
>> why are so many EPSG listed?
>>
>>
>> Best regards,
>>
>> Marcel
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>>
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