Candini, You can use the -sql option with the ogr2ogr utility. You can find further details of OGR's SQL capabilities in the RFC28 [1]. It also shows an example with arithmetic operations.
Tell us how it worked. [1]: http://trac.osgeo.org/gdal/wiki/rfc28_sqlfunc On Tue, Jul 19, 2011 at 3:24 PM, canduc17 <cand...@meeo.it> wrote: > Hi everyone. I have a shape file with the following characteristics: > INFO: Open of `faggete.shp' > using driver `ESRI Shapefile' successful. > > Layer name: faggete > Geometry: Polygon > Feature Count: 833 > Extent: (341942.975384, 4732949.828158) - (365163.422399, 4773205.622984) > Layer SRS WKT: > (unknown) > FID_fagget: Integer (9.0) > SUP_HA: Real (19.15) > STRINGA: String (11.0) > TF: String (11.0) > CV: String (11.0) > AX: String (11.0) > DE: String (11.0) > INR: String (11.0) > P: String (11.0) > TIPIFORE: String (11.0) > INT: String (11.0) > ATTRIBUTI: String (25.0) > COD_UNIV: String (50.0) > area_ha: Real (19.9) > FID_comuni: Integer (9.0) > NOME_COM: String (50.0) > NumHa: Real (19.11) > VolHa: Real (19.11) > Y_planted: Real (19.11) > Eta: Real (19.11) > Ws: Real (19.11) > Biomassa_e: Real (19.11) > Wr: Real (19.11) > Wf: Real (19.11) > > > I need to create a new vector file applying mathematical operations to some > field. > For example, let's say I have to double up every value of NumHa and sum > this > result to every value of VolHa. > And I have to insert these new values (for NumHa and VolHa) inside the new > vector. > How can I achieve this? > Is that possible with ogr2ogr? > > Thanks in advance... > > -- > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/ogr2ogr-create-a-new-shapefile-with-some-math-tp6598180p6598180.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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