[gdal-dev] ASCII file to AAIG format

[Even Rouault]

Le lundi 18 juillet 2011 18:01:08, Frank Warmerdam a écrit :
> Zoltan,
> 
> I haven't used it myself, but it looks like the XYZ driver might be
> ready made for your need:
> 
> http://www.gdal.org/frmt_xyz.html
> 
> It looks like it is new in 1.8.

The XYZ driver doesn't fit Zoltan's requirements because it relies on the fact 
that coordinates are sorted and regularly spaced.

So gdal_grid is the only option. With the help of a spread-sheet application 
or by any other adequate means, you should be able to transform your file into 
a CSV file and create a OGR VRT file that will be recognized as a valid OGR 
point datasource usable by gdal_grid. See the doc of the 2 drivers :

http://gdal.org/ogr/drv_csv.html
http://gdal.org/ogr/drv_vrt.html

> 
> Best regards,
> 
> On Mon, Jul 18, 2011 at 7:04 AM, Zoltan Szecsei <zoltans at geograph.co.za> 
wrote:
> > Hi,
> > I have an ASCII file of DEM points that need to be converted into AAIG
> > format, so I'm hoping gdal (_translate?) will do the trick
> > I do not want to rely on the fact that my DEM is column/row ordered, nor
> > that it is "exactly" 2m spaced.
> > 
> > Is there some free-format ASCII that gdal can read, or does anyone know
> > which of the formats read by GDAL won't need to be "ordered" or "exact".
> > I'm hoping GDAL will take the pain out of ordering my DEM, and creating
> > NODATA for missing cell values.
> > 
> > My file looks like this: (Easting, Northing, height, type)
> > 
> >>              570433.84    201262.28        73.65 MPoint
> >>              570433.84    201260.28        73.72 MPoint
> >>              570433.84    201258.28        73.79 MPoint
> >>              570433.84    201256.28        73.86 MPoint
> >>              570433.84    201254.28        73.89 MPoint
> >>              570433.84    201252.28        74.02 MPoint
> >>              570433.84    201250.28        74.16 MPoint
> > 
> > Thanks in advance,
> > Zoltan
> > 
> > --
> > 
> > ===========================================
> > Zoltan Szecsei PrGISc [PGP0031]
> > Geograph (Pty) Ltd.
> > P.O. Box 7, Muizenberg 7950, South Africa.
> > 
> > 65 Main Road, Muizenberg 7945
> > Western Cape, South Africa.
> > 
> > 34° 6'16.35"S 18°28'5.62"E
> > 
> > Tel: +27-21-7884897  Mobile: +27-83-6004028
> > Fax: +27-86-6115323     www.geograph.co.za
> > ===========================================
> > 
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