[Gvsig_english] Problem in WGS 84 to UTM SAD 69 transformation

Javier Galán galan_javsan at gva.es
Mon Oct 13 09:20:33 CEST 2008 

Hi Evemar:

Nowadays, the only way to share experiences or case studies is there, 
the users list. I don't know if in the future will be another place, but 
it's an interesting suggestion.

Regards.

PD: I'm not a developer, but I'm a tester ;P

Evemar Wernick escribió:
> Javier,
>
> That was it: I just have installed the update 1_1_2 and it worked fine!
>
> Thank you very much for you help.
>
> BTW: May I ask you if you are a gvsig developer?
> We are developing a scholar bus routing project and we are planning to 
> use gvSIG in Parana State's municipalities.
> I think it would be a good case study to relate. I would like to send 
> that relates to gvSIG team.
>
> Gracias!
> Evemar
>
> Evemar Wernick escreveu:
>> Hi, Javier
>>
>> Those are the steps I've already tried but I tried it again - and it 
>> does't work.
>> Please see my attached data.
>> Maybe could be some instalation or version problem... I don't know.
>> Currently, I'm using the "gvsig-1_1-windows-i586-withjre" (in the 
>> help/about: version 1.1 build 1015, java 1.5.0_12). I will try to 
>> install the update 1_1_2 and some tests...
>> What version are you using?
>>
>> Thank for your answer and for the EPSG information.
>>
>> Regards,
>> Evemar
>>
>>
>>
>> Javier Galán escreveu:
>>> Hi Evemar,
>>>
>>> I tried to transform and it works fine for me, I'll tell what I did
>>>
>>> 1. Open a new view with EPSG:4326
>>> 2. Add the shape "barracao_original_gps_wgs84"
>>> 3. Open geoprocessing
>>> 4. at Destiny projection select Epsg :29192  select EPSG 
>>> transformation  1877
>>> 5. Open a new view with EPSG:2919 add the arcgis an the new one
>>>
>>> May be you omitted any step.
>>>
>>> I attach the data transformed with gvSIG.
>>>
>>> Regards
>>>
>>>
>>>
>>>
>>> Evemar Wernick escribió:
>>>> Hi, Javier.
>>>>
>>>> Thanks again for your help and patience...
>>>> I've tried both 29172 and 29192 (for 1, 4, 14 epsg transformation, 
>>>> and no transformation), but it doesn't work.
>>>> The EPSG:29172 doesn't fit.
>>>> The EPSG 29182/29192 have precisions about 80-100 meters.
>>>> It's very strange because I compared the results of transformation 
>>>> from EPSG:4326 to:
>>>> - barracao_EPSG_4326_29182_1.shp
>>>> - barracao_EPSG_4326_29182_4.shp
>>>> - barracao_EPSG_4326_29182_14.shp
>>>> - barracao_EPSG_4326_29182_no_transformation.shp
>>>> - barracao_EPSG_4326_29192_1.shp
>>>> - barracao_EPSG_4326_29192_4.shp
>>>> - barracao_EPSG_4326_29192_14.shp
>>>> - barracao_EPSG_4326_29192_no_transformation.shp
>>>> and all of them are in the same position (without any displacement).
>>>>
>>>> I think gvSIG isn't using parameters in transformation...
>>>>
>>>> By the way, how did you find the definition and paramenters of the 
>>>> EPSG codes?
>>>>
>>>> Thanks,
>>>> Evemar
>>>>
>>>>
>>>> Javier Galán escreveu:
>>>>> Hi Evermar,
>>>>>
>>>>> Seeing the parameters I realized that it not the same definition 
>>>>> for the epsg and esri library.
>>>>> The both, in epsg library, that has the same definition as you 
>>>>> wrote are 29172/29192. I'm not sure if there's any difference 
>>>>> between them, but i didn't see any.
>>>>>
>>>>> May be that solve the problem.
>>>>>
>>>>> Regards
>>>>>
>>>>>
>>>>> Evemar Wernick escribió:
>>>>>> Javier,
>>>>>>
>>>>>> Thanks for your answer. I didn't have noticed that using EPSG I 
>>>>>> could set up transformations.
>>>>>>
>>>>>> Unfortunately, it didn't work. I tried to use the 3 
>>>>>> transformations avaliable to Brasil (1, 4 and 14), and tried also 
>>>>>> manually set up the parameters (to transformation (14): X= 
>>>>>> -66.87, Y= 4.37, Z= -38.52) without success (all the result files 
>>>>>> are always in the same position).
>>>>>>
>>>>>> I'm sending anexed the files used for the test and the results, 
>>>>>> and below the process conversion that I've tried (works in ArcGIS 
>>>>>> and not in gvSIG).
>>>>>>
>>>>>> *** Start ArcGIS process conversion ****
>>>>>>
>>>>>> In ArcGIS, I used the ArcToolBox’s Project tool:
>>>>>>
>>>>>> - Input Dataset or Feature Class: barracao_original_gps_wgs84.shp
>>>>>>
>>>>>> - Input Coordinate System (optional): GCS_WGS_1984  (code:4326)
>>>>>>
>>>>>> /Angular Unit: Degree (0,017453292519943299)
>>>>>> Prime Meridian: Greenwich (0,000000000000000000)
>>>>>> Datum: D_WGS_1984
>>>>>>   Spheroid: WGS_1984
>>>>>>     Semimajor Axis: 6378137,000000000000000000
>>>>>>     Semiminor Axis: 6356752,314245179300000000
>>>>>>     Inverse Flattening: 298,257223563000030000/
>>>>>>
>>>>>> - Output Dataset or Feature Class: 
>>>>>> barracao_ArcGIS_SAD69_Project14.shp
>>>>>>
>>>>>> - Output Coordinate System: SAD_1969_UTM_Zone_22S  (code:29182)
>>>>>>
>>>>>> /Projection: Transverse_Mercator
>>>>>> False_Easting: 500000,000000
>>>>>> False_Northing: 10000000,000000
>>>>>> Central_Meridian: -51,000000
>>>>>> Scale_Factor: 0,999600
>>>>>> Latitude_Of_Origin: 0,000000
>>>>>> Linear Unit: Meter (1,000000)
>>>>>>
>>>>>> Geographic Coordinate System: GCS_South_American_1969
>>>>>> Angular Unit: Degree (0,017453292519943299)
>>>>>> Prime Meridian: Greenwich (0,000000000000000000)
>>>>>> Datum: D_South_American_1969
>>>>>>   Spheroid: GRS_1967_Truncated
>>>>>>     Semimajor Axis: 6378160,000000000000000000
>>>>>>     Semiminor Axis: 6356774,719195305400000000
>>>>>>     Inverse Flattening: 298,250000000000000000/
>>>>>>
>>>>>> - Geographic Transformation (optional): SAD_1969_To_WGS_1984_14  
>>>>>> (code:1548)
>>>>>>
>>>>>> /GEOGTRAN["SAD_1969_To_WGS_1984_14",GEOGCS["GCS_South_American_1969",DATUM["D_South_American_1969",SPHEROID["GRS_1967_Truncated",6378160.0,298.25]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],METHOD["Geocentric_Translation"],PARAMETER["X_Axis_Translation",-66.87],PARAMETER["Y_Axis_Translation",4.37],PARAMETER["Z_Axis_Translation",-38.52]] 
>>>>>>
>>>>>> /
>>>>>> *** End ArcGIS process conversion ****
>>>>>>
>>>>>>
>>>>>> *** Start gvSIG process conversion ****
>>>>>>
>>>>>> In gvSIG, I used Geoprocess toolbox’s Reproject:
>>>>>>
>>>>>> - Input Cover: barracao_original_gps_wgs84.shp
>>>>>>
>>>>>> - Source Projection: EPSG: 4326
>>>>>>
>>>>>> - Target Projection: EPSG: 29182
>>>>>>
>>>>>> - Select Transformation: EPSG transformation
>>>>>>
>>>>>> <Next>
>>>>>>
>>>>>> - Transformation code: 1548 SAD69 to WGS 84 (14)
>>>>>>
>>>>>> - Output Cover: barracao_gvSIG_SAD69_Project14.shp
>>>>>>
>>>>>> *** End gvSIG process conversion ****
>>>>>>
>>>>>>
>>>>>> Please help. We are planning to use gvSIG in many governamental 
>>>>>> projects and this conversion is fundamental.
>>>>>>
>>>>>> Thanks in advance,
>>>>>>
>>>>>> Evemar Wernick
>>>>>> Brasil
>>>>>> evemar at paranacidade.org.br
>>>>>>
>>>>>>
>>>>>>
>>>>>> Javier Galán escreveu:
>>>>>>> Dear Eveman,
>>>>>>>
>>>>>>> That happens because gvSIG don have a library to do 
>>>>>>> transformation between ESRI definitions.
>>>>>>> What you can do is put the view an data whit an EPSG definition, 
>>>>>>> (I checked that the code is the same)
>>>>>>> and then you can choose the EPSG transformation that better fits 
>>>>>>> to your data.
>>>>>>>
>>>>>>> Regards
>>>>>>>
>>>>>>> Evemar escribió:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> I'm facing a similar problem:
>>>>>>>>
>>>>>>>> I received some gps data in WGS 84 (ESRI:4326) coordinate system.
>>>>>>>> When I reproject it to SAD 1969 UTM zone 22S (ESRI:29182) using 
>>>>>>>> gvSIG, it
>>>>>>>> doesn't fit correctly (difference ~100m)
>>>>>>>>
>>>>>>>> When I do the same using ESRI ArcCatalog, using the same 
>>>>>>>> parameters except
>>>>>>>> the "Geographic Transformation" (where I can choose 
>>>>>>>> SAD_1969_To_WGS_1984_14
>>>>>>>> - ESRI:1548), it fits nice.
>>>>>>>>
>>>>>>>> Someone knows how can I set those transformation parameters in 
>>>>>>>> gvSIG? Is it
>>>>>>>> possible?
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Evemar
>>>>>>>> Brasil
>>>>>>>>
>>>>>>>
>>>>>> ------------------------------------------------------------------------ 
>>>>>>
>>>>>>
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>>>>>>   
>>>>>
>>>>>
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>>>
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-- 
Javier Galán Sánchez
Proyecto gvSIG
Consellería de Infraestructuras y Transportes (GVA)
Valencia (España)

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