[GRASS5] Re: vector point dataset
gordon.keith at csiro.au
Wed Nov 17 17:29:54 EST 2004
On Thu, 18 Nov 2004 01:22, Helena wrote:
> We have a project (with authors of r.terraflow) for computing massive DEMs
> and your data set looks like the size that we are aiming at, but there may
> be other bottlenecks in GRASS than gridding so we need to look at those
I'm working with bathymetry data from multibeam echosounders, typically
working with 10s of millions of points to create grids a few thousand by a
few thousand cells.
Is this project likely to be of interest to me (or vice versa)?
> >> A typical use for me, would be taking 120,000,000 point elevations and
> >> building a DEM. I have mainly used GMT for this, so hope to simply
> >> import the GMT netCDF grids (so far unsuccesfully)
I've basically given up on creating the DEM in GRASS and do all the work in
MBSystem, which generates GMT format grids.
I haven't been able to import GMT netCDF grids (haven't really tried) but have
no trouble importing grids in what MBSystem describes as
"GMT format id 1: Native binary single precision floats in scanlines with
leading grd header" using 'r.in.bin -hf'. I think MBSystem also describes
this format as "binary file (GMT version 1 GRD file)".
I'm not real familiar with GMT, but this might be of help to you.
CSIRO Marine Research
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