[Gvsig_english] computing X,Y coordinates

[Nik Go]

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.


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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