Re: [GRASS-user] Export specific shapes from a vector file
Thanks, very interesting and useful job, Καλό Τσίκνισμα, Λεωνίδας:-D -- View this message in context: http://n2.nabble.com/Export-specific-shapes-from-a-vector-file-tp2337165p2354772.html Sent from the Grass - Users mailing list archive at Nabble.com. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Export specific shapes from a vector file
Λεωνίδα, you might be interested in this tutorial: Αναπαραγωγή του χάρτη CORINE με το GRASS-GIS (http://users.hol.gr/~dzach/tilaphos/corine_grass-gis_el.pdf) published at http://tilaphos.blogspot.com/2009/02/gis-corine.html Χαιρετίσματα, Νίκος ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Export specific shapes from a vector file
I need to export specific shapes from a grass vector file to another grass vector file. Also, I need to convert specific polygons from a vector grass file to a raster grass file. How can I do that? Thanks, Leonidas -- View this message in context: http://n2.nabble.com/Export-specific-shapes-from-a-vector-file-tp2337165p2337165.html Sent from the Grass - Users mailing list archive at Nabble.com. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Export specific shapes from a vector file
On Mon, 2009-02-16 at 12:55 -0800, leonidas wrote: I need to export specific shapes from a grass vector file to another grass vector file. v.extract in=VectorMap out=ExtractedFeatures ... # you can use list= to extract specific categories (the cat column) # or an SQL where clause, e.g. something like where='SomeColumn=SomeString' Also, I need to convert specific polygons from a vector grass file to a raster grass file. I assume by polygons you mean areas. v.to.rast in=VectorMap out=RasterMap type=area ... # use=??? You need to decide which values you will assign to your pixels. How can I do that? Thanks, Leonidas Regards, Nikos ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Export specific shapes from a vector file
Thank you Niko, well I understand the first one (using v.extract). -Is it possible to do something like that using v.out.ogr and export to shapefile? -As far as concerns the second question using v.to.rast, how can I export only specific areas using sql where clause or list for specific categories? Thanks again, Leonidas Nikos Alexandris wrote: On Mon, 2009-02-16 at 12:55 -0800, leonidas wrote: I need to export specific shapes from a grass vector file to another grass vector file. v.extract in=VectorMap out=ExtractedFeatures ... # you can use list= to extract specific categories (the cat column) # or an SQL where clause, e.g. something like where='SomeColumn=SomeString' Also, I need to convert specific polygons from a vector grass file to a raster grass file. I assume by polygons you mean areas. v.to.rast in=VectorMap out=RasterMap type=area ... # use=??? You need to decide which values you will assign to your pixels. How can I do that? Thanks, Leonidas Regards, Nikos ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- View this message in context: http://n2.nabble.com/Export-specific-shapes-from-a-vector-file-tp2337165p2337293.html Sent from the Grass - Users mailing list archive at Nabble.com. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Export specific shapes from a vector file
On Mon, 2009-02-16 at 13:14 -0800, leonidas wrote: Thank you Niko, well I understand the first one (using v.extract). -Is it possible to do something like that using v.out.ogr and export to shapefile? AFAIK, no. The way to do it is: v.extract + v.out.ogr -As far as concerns the second question using v.to.rast, how can I export only specific areas using sql where clause or list for specific categories? Apologies, I overlooked the word specific before. Here (again) I think you would need v.extract + v.to.rast. An example: Let's say you have the CORINE map in whose attribute table you have a column named level3 of type integer (with a lentgh of 3) which contains the CORINE land cover class codes (111,112,113, etc.). And now you need to extract specific classes, that is areas with specific level3 codes (i.e. 111, 112, 122, 123, 141, 142). Then you could do: v.extract in=corine_ellas_v2 out=corine_ellas_v2_subset where='level3=111 or level3=112 or level3=112 or level3=122 or level3=123 or level3=141 or level3=142' --o then v.to.rast in=corine_ellas_v2_subset out=corine_ellas_v2_subset use=attr column=level3 Hope that helps Cheers, Nikos ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Export specific shapes from a vector file
Yes that was what exactly I need.Thanks again Nikos Alexandris wrote: On Mon, 2009-02-16 at 13:14 -0800, leonidas wrote: Thank you Niko, well I understand the first one (using v.extract). -Is it possible to do something like that using v.out.ogr and export to shapefile? AFAIK, no. The way to do it is: v.extract + v.out.ogr -As far as concerns the second question using v.to.rast, how can I export only specific areas using sql where clause or list for specific categories? Apologies, I overlooked the word specific before. Here (again) I think you would need v.extract + v.to.rast. An example: Let's say you have the CORINE map in whose attribute table you have a column named level3 of type integer (with a lentgh of 3) which contains the CORINE land cover class codes (111,112,113, etc.). And now you need to extract specific classes, that is areas with specific level3 codes (i.e. 111, 112, 122, 123, 141, 142). Then you could do: v.extract in=corine_ellas_v2 out=corine_ellas_v2_subset where='level3=111 or level3=112 or level3=112 or level3=122 or level3=123 or level3=141 or level3=142' --o then v.to.rast in=corine_ellas_v2_subset out=corine_ellas_v2_subset use=attr column=level3 Hope that helps Cheers, Nikos ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- View this message in context: http://n2.nabble.com/Export-specific-shapes-from-a-vector-file-tp2337165p2337658.html Sent from the Grass - Users mailing list archive at Nabble.com. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
