[GRASS-user] How to import NASA SRTM DEM data into VTK

GRASS GRASS user
1

Hi,
How can I import NASA SRTM DEM data, stored in a file format called hgt, into VTK-5.3.x?

Apparently the *hgt file format can just be renamed to *.dem, but the contents of the file are stored in a format called GTOPO30 DEM, I think.

When I opened the SainteHelens.dem file supplied with the VTK Data package, I can see that it consists of ascii values and is human-readable.

However, when I look at a NASA SRTM file, it appears to be some sort of binary file format.

Here is an example of a NASA SRTM file ftp://e0srp01u.ecs.nasa.gov/srtm/version2/SRTM3/Australia/S34E150.hgt.zip

vtkDEMReader will not directly work with the NASA SRTM file.

Has someone implemented a reader that will read in the NASA SRTM file?

If someone can help point me in the right direction, I can even spend some time and try to implement a new vtkSRTMReader class.

Best regards,

Elvis Dowson

2

On Sun, Oct 12, 2008 at 10:59 AM, Elvis Dowson <elvis.dowson@mac.com> wrote:

Hi,
        How can I import NASA SRTM DEM data, stored in a file format called
hgt, into VTK-5.3.x?

See r.in.srtm. Then export to whatever VTK reads with r.out.gdal.

Markus

3

Markus Neteler schrieb:

On Sun, Oct 12, 2008 at 10:59 AM, Elvis Dowson <elvis.dowson@mac.com> wrote:

Hi,
        How can I import NASA SRTM DEM data, stored in a file format called
hgt, into VTK-5.3.x?

See r.in.srtm. Then export to whatever VTK reads with r.out.gdal.

Markus
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

there is also r.out.vtk
http://grass.itc.it/grass63/manuals/html63_user/r.out.vtk.html

Regards
Wolfgang

4

The open source VTK viewer Visit can import GDAL/OGR supported data
directly (including SRTM HGT):

https://wci.llnl.gov/codes/visit/

From there, you can export as a VTK dataset.

I'd love to have a GDAL/OGR reader in ParaView though, as I think
that it has a much better UI.

Ben

WolfgangZ wrote:

Markus Neteler schrieb:

On Sun, Oct 12, 2008 at 10:59 AM, Elvis Dowson <elvis.dowson@mac.com> wrote:

Hi,
        How can I import NASA SRTM DEM data, stored in a file format called
hgt, into VTK-5.3.x?

See r.in.srtm. Then export to whatever VTK reads with r.out.gdal.

Markus
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

there is also r.out.vtk
http://grass.itc.it/grass63/manuals/html63_user/r.out.vtk.html

Regards
Wolfgang

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

--
Benjamin Ducke
Senior Applications Support and Development Officer

Oxford Archaeology Ltd
Janus House
Osney Mead
OX2 0ES
Oxford, U.K.

Tel: +44 (0)1865 263 800 (switchboard)
Tel: +44 (0)1865 980 758 (direct)
Fax :+44 (0)1865 793 496
benjamin.ducke@oxfordarch.co.uk

------
Files attached to this email may be in ISO 26300 format (OASIS Open Document Format). If you have difficulty opening them, please visit http://iso26300.info for more information.