[Gvsig_english] problems with on-the-fly projection

[Sergio Clark]

Hi Moritz,

Apart from selecting Projections (for the View and also for the loaded 
layers), have you selected 'Transformation = EPSG transformation', and 
then choose one of them in next interface? If so, maybe the log file 
could give as more information about the problem...

Regards,

sergio



Moritz Lennert escribió:
> On Sun, May 25, 2008 17:59, Marcus C. England wrote:
>   
>> Sorry... I cued in on the topographic map which is usually a raster (and
>> I just woke up and haven't had my coffee yet!). Are you sure you are
>> using the correct transformation? If so, are you running gvSIG on the
>> correct version of java? When I first started using gvSIG I had problems
>> with some transformations and it had something to do with me running it
>> on java 1.6. When I reinstalled using java 1.5 the problem went away. I
>> use gvSIG daily for all my GIS and have not run into any problems with
>> vector projections.
>>     
>
> I installed and use the java that came with the gvSIG installer, so I
> would hope that this shouldn't be the reason.
>
> Moritz
>
>   
>> -Marcus
>>
>> Moritz Lennert wrote:
>>     
>>> On Sun, May 25, 2008 17:26, Marcus C. England wrote:
>>>
>>>       
>>>> Hi Moritz,
>>>>
>>>> GvSIG only reprojects vector data, not raster data. My understanding is
>>>> that they hope to have this for rasters soon.
>>>>
>>>>         
>>> The two shapefiles I speak about below are vectors... And in the example
>>> with the topo raster map, I reproject the GPS points/tracks (i.e.
>>> vectors)
>>> to the projection of the topo map. And it works, but only more or less,
>>> since the result is off by +/- 100m.
>>>
>>> As I mentioned, QGIS has the same problem. See:
>>> http://trac.osgeo.org/qgis/ticket/1079.
>>>
>>> Moritz
>>>
>>>
>>>       
>>>> -Marcus
>>>>
>>>> Moritz Lennert wrote:
>>>>
>>>>         
>>>>> Hello,
>>>>>
>>>>> I have some trouble with on-the-fly projection: using gps data coming
>>>>> in
>>>>> WGS84 (epsg 4326) and a topographic map in Belgian Lambert (epsg
>>>>> 31370),
>>>>> the two do not superpose correctly.
>>>>>
>>>>> When importing the data into GRASS, I get perfect superposition. And
>>>>> when
>>>>> I import the gps data into a GRASS 4326 location and the same data
>>>>> into
>>>>> a
>>>>> 31370 location, then reproject from one to the other, I also get
>>>>> perfect
>>>>> superposition of the two versions of the gps data. However, when I
>>>>> export
>>>>> to shapefiles from both locations and then load them in gvSIG
>>>>> indicating
>>>>> their respective projections, I get a difference of about 100m.
>>>>>
>>>>> Hamish Bowman suggested on the GRASS-users list that such a difference
>>>>> hints at an issue with datum transformation.
>>>>>
>>>>> I get the same kind of error using on-the-fly projection in QGIS.
>>>>>
>>>>> Moritz
>>>>>
>>>>> _______________________________________________
>>>>> Gvsig_internacional mailing list
>>>>> Gvsig_internacional at runas.cap.gva.es
>>>>> http://runas.cap.gva.es/mailman/listinfo/gvsig_internacional
>>>>>
>>>>>
>>>>>
>>>>>           
>>>> _______________________________________________
>>>> Gvsig_internacional mailing list
>>>> Gvsig_internacional at runas.cap.gva.es
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>>>>
>>>>
>>>>
>>>>         
>>>
>>>
>>>       
>>     
>
>
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>
>
>   


-- 

Sergio Clark
Equipo gvSIG
IVER T.I., S.A.
www.iver.es
www.gvsig.com


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