[Gvsig_english] problems with on-the-fly projection

[Moritz Lennert]

On Mon, May 26, 2008 16:47, Sergio Clark wrote:
> 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..

I've finally gotten around to test this and can confirm that through
choosing the correct transformation, the problem is solved.

Thank you Sergio !

Moritz

.
>
> 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
>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>>
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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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