[pdal] Classification of Points Changed?

[Robert Dzur]

Hi Andrew,

Appreciate your message.  The input point cloud was processed with FME to 1.4 PDRF=1.  I realized the classification had changed in a couple of ways; first with pdal info I noticed that the Classification min max (1, 2) changed to (0, 255) and in FME Data Inspector when I queried the points; they were all over the range.  Yeah, I’m not exactly sure how to change the classification byte offset in pdal translate (i.e. via --writers.las.Classification.Offset=) or if I should be using pdal pipeline.  Also, when I set the PDRF=6, and view the data in FME Data Inspector it seems to modify the point cloud projection (scaling and/or offsets) since FME Data Inspector doesn’t interpret the point cloud as a contiguous block of point data even though I can still query the points.

Thanks again and I’ll provide the small input test las file.

Rob
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From: Andrew Bell <andrew.bell.ia at gmail.com<mailto:andrew.bell.ia at gmail.com>>
Date: Monday, July 13, 2015 at 6:07 AM
To: Robert Dzur <rdzur at bhinc.com<mailto:rdzur at bhinc.com>>
Cc: "pdal at lists.osgeo.org<mailto:pdal at lists.osgeo.org>" <pdal at lists.osgeo.org<mailto:pdal at lists.osgeo.org>>
Subject: Re: [pdal] Classification of Points Changed?

On Sun, Jul 12, 2015 at 11:03 AM, Robert Dzur <rdzur at bhinc.com<mailto:rdzur at bhinc.com>> wrote:
Hi List,

I am experimenting with the following pdal translate command:

pdal translate --writers.las.minor_version="4" --writers.las.format="6" --a_srs "EPSG:2903" --input pc16351450.las --output pc16351450_pdrf6_wkt.las

The input las contains only two classifications (1 & 2), however, on output the result has significant changes to point classification; is there a flag that I’m missing to maintain the classification through translation.

There has been no intentional change.  If you could submit a bug report with the command you're using (what you've shown above) and a small example input file, that would be appreciated.

--
Andrew Bell
andrew.bell.ia at gmail.com<mailto:andrew.bell.ia at gmail.com>
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