[gdal-dev] shape file to GMT dem file

[Tyler Mitchell]

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 at 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
> 
> 
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Tyler Mitchell
Engineering Director 
Actian Corporation
tyler.mitchell at actian.com

MOBILE 250-303-1831
SKYPE spatialguru
www.actian.com

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