[GRASS-dev] G7: v.loutlier Decomposition failed

Blumentrath, Stefan Stefan.Blumentrath at nina.no
Fri Dec 6 07:20:41 PST 2013

I fed just points which where classified as "ground", but which I know do contain vegetation...

From: Newcomb, Doug [mailto:doug_newcomb at fws.gov]
Sent: 6. desember 2013 15:26
To: Blumentrath, Stefan
Cc: grass-dev at lists.osgeo.org
Subject: Re: [GRASS-dev] G7: v.loutlier Decomposition failed

Are those bare earth points only, or are you feeding it the entire point cloud?

On Fri, Dec 6, 2013 at 7:17 AM, Blumentrath, Stefan <Stefan.Blumentrath at nina.no<mailto:Stefan.Blumentrath at nina.no>> wrote:

Maybe it is not of importance, because no one else would use such extreme settings, but in case someone considers it as a bug:

I was testing a bit with v.outlier in GRASS 7 on dense LiDAR data (~4 points per m2).

When I use a very low Tykhonov regularization parameter (lambda_i) of 0.0000000000000000001 and rather short spline steps (1.5) at 0.5m resolution I get an error-message:
"Decomposition failed at row 16499 and col 0"

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Doug Newcomb
Raleigh, NC
919-856-4520 ext. 14 doug_newcomb at fws.gov<mailto:doug_newcomb at fws.gov>
The opinions I express are my own and are not representative of the official policy of the U.S.Fish and Wildlife Service or Dept. of the Interior.   Life is too short for undocumented, proprietary data formats.
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