Thank you very much for your reply. I misunderstood the –a option. It works beautifully and our SHP as well as KML files now have each contour clearly labelled with its value. Here’s an example of a command that does the trick.
gdal_contour -a Thickness[cm] -fl 1.000000 2.000000 5.000000 50.000000 100.000000 <tiffile> <shpfile> We then convert to kml using ogr2ogr Thanks again Ole Dr Ole Nielsen Numerical Modeller Australia-Indonesia Facility for Disaster Reduction Mobile: +62 811 820 4637 | Phone: +62 21 398 30088 x1007 | Fax: +62 21 398 30068 [cid:[email protected]] From: Chaitanya kumar CH [mailto:[email protected]] Sent: Wednesday, 7 July 2010 3:27 PM To: Ole Nielsen Cc: [email protected]; [email protected]; Kristy Van Putten Subject: Re: [gdal-dev] Which contour is which? Ole, You can specify a field in the contour features using the '-a' option. You can also use the '-3d' option to include the elevation value in the z value at every vertex. (http://www.gdal.org/gdal_contour.html) On Wed, Jul 7, 2010 at 1:26 PM, Ole Nielsen <[email protected]<mailto:[email protected]>> wrote: Dear all We are using gdal_contour to generate shape files. They look good and appear to be correct, but we need to label them with the value they represent. However, no such information appears to be available in the shape files. We thought we could work with the ID attribute which is the only information available in the shapefiles generated by gdal_contour, but that does not generally reflect the order of the contour lines either. How is it possible to determine which contour line corresponds to a particular level? Best regards Ole Dr Ole Nielsen Numerical Modeller Australia-Indonesia Facility for Disaster Reduction Mobile: +62 811 820 4637 | Phone: +62 21 398 30088 x1007 | Fax: +62 21 398 30068 [cid:[email protected]] _______________________________________________ gdal-dev mailing list [email protected]<mailto:[email protected]> http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E
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