[Gvsig_english] computing area

[Benjamin Ducke]

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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> 
>     -- 
>     César Martínez Izquierdo
>     Equipo de desarrollo gvSIG
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-- 
Benjamin Ducke
Senior Applications Support and Development Officer

Oxford Archaeology Ltd
Janus House
Osney Mead
OX2 0ES
Oxford, U.K.

Tel: +44 (0)1865 263 800 (switchboard)
Tel: +44 (0)1865 980 758 (direct)
Fax :+44 (0)1865 793 496
benjamin.ducke at oxfordarch.co.uk




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