Hi Simon, well, I browsed a little bit and found an answer: you can export your polygon layer to an annotation layer (export to... annotation). Then edit this annotation layer (add x- and y-coordinates using the field calculator).
best, wolfgang Am Mittwoch, den 25.11.2009, 00:20 +1100 schrieb Simon Cropper (Botanicus Australia Pty Ltd): > Hi, > > I have found some answers. > > First X, Y can be extracted with the field calculator using the > functions x() and y(). > > Sextante can be used to extract the centre point of a polygon. > > This aside is there any way of consolidating these tasks? Can you > calculate the centre point of a polygon in gvSIG? > > Cheers Simon > > Simon Cropper > Botanicus Australia Pty Ltd > PO Box 160, Sunshine, Victoria 3020. > P: 9311 5822. M: 041 830 3437. > mailto: [email protected] > <mailto:[email protected]> > web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au> > > > > Simon Cropper (Botanicus Australia Pty Ltd) wrote: > > Hi Everyone, > > > > Can someone tell me if gvSIG can be used to establish the centre point > > of a polygon? > > > > ... and subsequently place the X and Y coordinates in fields in the > > attribute table of the polygon shapefile? > > > > ... or alternatively create a point file representing the centrepoint > > and be able to assign the XY values to that shapefile. > > > > What I regularly do in alternative programs (OpenJUMP, Kosmo, Sextante) > > is create a point file showing the centrepoint of a set of polygons > > (usually representing the sites I have surveyed) and then using ArcView > > assign the XY coordinate of the points to the northing+easting fields. > > Reproject into Lat-Long and repeat. These coordinates are used to report > > the sites locations to government agencies. > > > > How would you do this in gvSIG? > > > > Can you use Jpython to do this? > > > _______________________________________________ > Gvsig_internacional mailing list > [email protected] > http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional _______________________________________________ Gvsig_internacional mailing list [email protected] http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
