[Gvsig_english] computing X,Y coordinates

[Agustin Diez Castillo]

El Feb 24, 2009, a las 1:33 PM, Nik Go escribió:

> It worked! Thanks to Benjamin for pointing me to right direction and  
> Javier for expounding on it.
>
> And here's a tip for newbies (like me): make sure you select all the  
> records  (press CTRL+A) while editing the table. If you don't, the  
> values will only apply to the currently selected field.
You can do either so or unselect all. A third alternative is the  
Sextante centroid command that inherits the polygon atributes but not  
x and y.

>
>
>
> On Tue, Feb 24, 2009 at 4:36 PM, Javier Galán <galan_javsan at gva.es>  
> wrote:
> Hi Nik,
>
> Maybe what you could do is to export your polygon shape to an  
> annotation shape, opening it as an shp, you'll get a point shp.  
> Calculate its X Y with the field calculator. About that, if you are  
> working with a geodetic projection (long/lat) the X/Y will be  
> longitude and latitude. Then join both tables.
>
> Regards.
>
> Javier
>
> Nik Go wrote:
> I'm sorry if my original post was not clear on this but x,y in that  
> post meant lat/long coordinates for me. So does this produce the lat/ 
> long coordinates, similar to what the link I made does in AV?
>
>
> On Mon, Feb 23, 2009 at 5:11 PM, Benjamin Ducke <benjamin.ducke at oxfordarch.co.uk 
>  <mailto:benjamin.ducke at oxfordarch.co.uk>> wrote:
>
>    It should also be able to "misuse" an annotation layer for that
>    purpose.
>    You should be able to create an annotation layer from your polygon
>    file.
>    This will be a simple points file with a centroid for each polygon
>    where
>    the annotation is supposed to go. Simply load that new layer back  
> into
>    your project as a regular Shapefile, then use the field calculator
>    to get the X/Y coordinates.
>
>    Ben
>
>
>    Sergio Clark wrote:
>
>        Hi Nik,
>
>        It's possible to get X and Y coordinates of a shape, if it is
>        type point. You can do this by using the Field Calculator in
>        gvSIG. First, 'start editing' your shp, then open its table
>        and add numeric fields for X and Y values. With this field
>        selected in the table click 'Field calculator' and use
>        functions 'x' and 'y' to get these values.
>
>        But if you mean getting the X,Y coordinates of a centroid (for
>        a polygon shape), you should write a jython script and then
>        use the 'Advanced' label of the Field Calculator in order to
>        load and use it (I don't know the exact code for this script  
> now).
>
>
>        Hope it helps,
>        Regards
>
>        Sergio.
>
>
>
>
>        Nik Go escribió:
>
>            Hi everyone.
>
>            I'm trying to find out if I can retrieve the X,Y
>            coordinates of my shape features (perhaps, it's center?)
>             Arcview can do something like this: HowTo:  Calculate
>            Latitude and Longitude values using the Field Calculator
>            <http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=31863
>            <http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=31863 
> >>.
>
>
>            Is it possible to do something similar in gvSIG? I've been
>            trying to twist my head on this problem for a few days now.
>
>            I'm running gvSIG 1.1 and 1.9a on Ubuntu 8.10.
>             
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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
>    <mailto:benjamin.ducke at oxfordarch.co.uk>
>
>
>
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>
> -- 
> Javier Galán Sánchez
> Proyecto gvSIG
> Consellería de Infraestructuras y Transportes (GVA)
> Valencia (España)
>
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