[GRASS-user] RE: [GRASS-dev] Re: [STATSGRASS] r.in.xyz: New module
and binning massive x, y, z datasets (LIDAR, Swath bathymetry)
epatton at nrcan.gc.ca
Mon Jun 12 12:11:23 EDT 2006
Thanks for this script! It's MUCH better than the hack I was using (i.e.,
xyz --> GMT's xyz2grd --> r.in.bin). I can confirm the program worked
perfectly with a 980MB swath multibeam bathymetry dataset.
epatton at nrcan.gc.ca
From: grass-dev-bounces at grass.itc.it [mailto:grass-dev-bounces at grass.itc.it]
Sent: Monday, June 12, 2006 12:48 PM
Cc: grassuser at grass.itc.it; statsgrass at grass.itc.it; grass-dev at grass.itc.it
Subject: [GRASS-dev] Re: [STATSGRASS] r.in.xyz: New module for loading and
binning massive x, y, z datasets (LIDAR, Swath bathymetry)
I think this is a wonderful and much needed addition. Thank you very much!
> In blatant violation of any sort of feature freeze for the next
> release of GRASS GIS I have added a new (long missing) module to GRASS
> This is a replacement for s.in.ascii+ s.cellstats+ s.to.rast in GRASS 5.
> The r.in.xyz module will load and bin ungridded x,y,z ASCII data into
> a new raster map. The user may choose from a variety of statistical
> methods in creating the new raster.
> r.in.xyz is designed for processing massive point cloud datasets, for
> example raw LIDAR or sidescan sonar swath data.
> And it's fast. Very fast.
> help page:
> The r.to.vect module has been given a "-b" flag to skip building
> vector topology (same as v.in.ascii) and the v.surf.rst interpolation
> module has been modified to not require topology from input points.
> This gets around the approx 3 million point memory limit of the vector
> engine due to topology overhead. [i.e. you can fill holes with
> regularized splines]
> question for stats experts: Should it be using population or sample
> variance? n is generally low so it makes a difference here. In
> r.univar it is usually so large not to matter (there we use population
> variance for vague reasons).
> Thanks to Helena Mitasova for testing and helping me work out the last
> few bugs. I would be interested to hear how things go with Large input
> files (LFS, bigger than 2gb).
> statsgrass mailing list
> statsgrass at grass.itc.it
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177
EMAIL: thomas.adams at noaa.gov
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