Do you have elevation data stored in the source data somewhere? You can convert lines to points using QGIS Vector tool -> Extract Nodes, but if you do not have elevation values stored in the attribute table for the lines, it won't help you :)
Feel free to share a zipped set of files with me (directly) if you want me to take a peek. Tyler On 2013-01-29, at 1:28 PM, Murat BEYHAN wrote: > Dear Mitchell, > Thanks for repply me. > As you say I have to obtain point data first. If I would able to obtain xyz > data it will be easy using GMT xyz2grd. > But my problem I could not do that. So I produced point data using ogr2ogr > command and it is drawn by qgis well > The picture on this mail. Lines belongs shapefile and points belongs GMT > data. But there is a problem its atribute table are null > and ogrinfo gives 0.0 for the field structure. So is this normal or not. And > I couldn't achieve to use gdal_grid using GMT data file. > Do you have any idea, please. > Thanks > > murat@murat:~/maps$ ogr2ogr -f "GMT" -nlt point test1.gmt e34c3_n.shp > murat@murat:~/maps$ ogrinfo -so -al test1.gmt > INFO: Open of `test1.gmt' > using driver `GMT' successful. > > Layer name: test1 > Geometry: Point > Feature Count: 341440 > Extent: (697857.170000, 4597069.190000) - (708674.200000, 4611236.780000) > Layer SRS WKT: > (unknown) > UserId: Real (0.0) > FNODE_: Real (0.0) > TNODE_: Real (0.0) > LPOLY_: Real (0.0) > RPOLY_: Real (0.0) > LENGTH: Real (0.0) > CVRGE34C3#: Integer (0.0) > CVRGE34C3-: Integer (0.0) > DETAY: String (0.0) > SEMBOL: Integer (0.0) > YUKSEKLIK: Real (0.0) > > > > > > On Tue, 29 Jan 2013 12:05:17 -0800, Tyler Mitchell wrote > > gdal_grid command can convert OGR to GDAL formats, but you need to only > > have point data. Your line shape file won't work with it. > > So if you can convert your lines into a set of points, and you will need a > > Z or elevation point or attribute to point gdal_grid to. > > > > Perhaps you already have the point data in your grass dataset that you > > could export to GDAL. But I also suspect you just do all you need to in > > grass itself. > > > > Tyler > > > > On 2013-01-29, at 11:04 AM, Murat BEYHAN wrote: >> >> > Dear All, >> > >> > Is it possible to obtain dem grid data from shapefile using gdal or ogr. >> > info about shape file as follows >> > >> > murat@murat:~/maps$ ogrinfo -so -al e34c3_n.shp >> > INFO: Open of `e34c3_n.shp' >> > using driver `ESRI Shapefile' successful. >> > >> > Layer name: e34c3_n >> > Geometry: Line String >> > Feature Count: 4047 >> > Extent: (697857.170000, 4597069.190000) - (708674.200000, 4611236.780000) >> > Layer SRS WKT: >> > (unknown) >> > UserId: Real (11.0) >> > FNODE_: Real (11.0) >> > TNODE_: Real (11.0) >> > LPOLY_: Real (11.0) >> > RPOLY_: Real (11.0) >> > LENGTH: Real (18.5) >> > CVRGE34C3#: Integer (5.0) >> > CVRGE34C3-: Integer (5.0) >> > DETAY: String (12.0) >> > SEMBOL: Integer (3.0) >> > YUKSEKLIK: Real (12.3) >> > >> > I have installed and use grass, GMT and qgis, but I'm not good at GIS. My >> > purpose is to obtain slope map of topographic data. >> > >> > any suggestion appreciated. >> > Regards >> > >> > Murat >> > >> > -- >> > This message has been scanned for viruses and >> > dangerous content by MailScanner, and is >> > believed to be clean. >> > >> > _______________________________________________ >> > gdal-dev mailing list >> > [email protected] >> > http://lists.osgeo.org/mailman/listinfo/gdal-dev >> > > > > > > > > > > > > > > > > > > > > Tyler Mitchell > > Engineering Director > > Actian Corporation > > > [email protected] > > > > > > > MOBILE 250-303-1831 > > SKYPE spatialguru > > www.actian.com > > > > > > > -- > > This message has been scanned for viruses and > > dangerous content by MailScanner, and is > > believed to be clean. > > > Murat Beyhan > Jeofizik Yük. Müh. > T.C. > BAŞBAKANLIK > Afet ve Acil Durum Yönetimi Başkanlığı > Deprem Dairesi Başkanlığı > Eskişehir Yolu 12. Km. Lodumlu/Ankara > Tel:+90 (312) 2872680-1550 > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > <map.jpg> Tyler Mitchell Engineering Director Actian Corporation [email protected] MOBILE 250-303-1831 SKYPE spatialguru www.actian.com
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