[Gvsig_english] computing area

[Nik Go]

Its  EPSG:23030 though normally it should be WGS84 / EPSG4326 but if I don't
change the projection, I cannot edit the shapefile.
I get the following error message:

> no es posible editar capa reproyectada, para editaria primero utilliza el
> geoproceseso de reproyektar



On Thu, Feb 26, 2009 at 5:23 PM, Benjamin Ducke <
benjamin.ducke at oxfordarch.co.uk> wrote:

> So what spatial reference system is your view using?
> Cartesian? Latitude/longitude? EPSG Code?
>
> Ben
>
> Nik Go wrote:
>
>> I'm sorry for the completing the details. Here they are:
>>
>> gvSIG version: 1.9a build 1226
>> gvSIG OAD edition based on v 1.1.2
>> OS - 64 bit Ubuntu 8.04
>>
>> Surprisingly, the numbers returned by both versions are the same. The
>> project properties has been set to km^2 already and I made no
>> re-projections. (Should I?) There were no internal polygons in the feature I
>> tested.
>> Excuse me if these question seems basic, I'm still learning new things
>> about GIS in gvSIG.
>>
>> Salud,
>> Nik
>>
>>
>>
>>
>> 2009/2/25 Cesar Martinez Izquierdo <cesar.martinez at iver.es <mailto:
>> cesar.martinez at iver.es>>
>>
>>    Hello Nik,
>>
>>    It is necessary that you provide some details when you report a
>>    problem, otherwise it's impossible to find the problem.
>>
>>    Which version of gvSIG are you using?
>>    Which CRS have set in the view? And in the layer? Which measurement
>>    units did you set?
>>
>>    Regards,
>>
>>     César
>>
>>    Nik Go escribió:
>>
>>        I'm trying to determine the total area of features but the
>>        area() function of the field calculator are returning numbers
>>        that are off the real-world sizes. I have real-world numbers for
>>        comparison. (Calculator returns 0.122893 km^2 when the actual
>>        size is 1,483.38 km^2 )
>>
>>
>>        Am I doing anything wrong?
>>
>>
>>
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>>
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>
>
> --
> Benjamin Ducke
> Senior Applications Support and Development Officer
>
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