[pdal] Attempting to filter out (1) Unclassified points flagged as Withheld

[Andrew Bell]

The pipeline doesn't seem to match the output you show, so it's hard to
know what's going on. If you want to share a file I can see what's up.

On Tue, Aug 3, 2021 at 5:22 PM Rose Phillips <RPhillips at linz.govt.nz> wrote:

> Hi Andrew,
>
>
>
> Thank you for the heads up, I tried the following pipeline;
>
>
>
> {
>
>     "pipeline" : [
>
>     {
>
>         "type" : "readers.las",
>
>         "filename" : "input.las"
>
>     },
>
>     {
>
>         "type" : "writers.las",
>
>         "a_srs" : "EPSG:2193+7839",
>
>         "filesource_id" : "0",
>
>         "filename" : "output.las",
>
>         "where": "ClassFlags!=129"
>
>     }
>
>     ]
>
> }
>
>
>
> However my output LAZ file still had these bits intact;
>
>
>
> {
>
>   "file_size": 3007189,
>
>   "filename": "C:\\Temp\\scan_angle\\test_file\\processed\\
> CL2_BW24_2020_1000_4526.laz",
>
>   "now": "2021-08-04T09:20:17+1200",
>
>   "pdal_version": "2.3.0 (git-version: Release)",
>
>   "reader": "readers.las",
>
>   "stats":
>
>   {
>
>     "statistic":
>
>     [
>
>       {
>
>         "average": 6.704382019,
>
>         "count": 1307434,
>
>         "maximum": 129,
>
>         "minimum": 2,
>
>         "name": "Classification",
>
>         "position": 0,
>
>         "stddev": 21.69585237,
>
>         "values":
>
>         [
>
>           2,
>
>           3,
>
>           4,
>
>           5,
>
>           7,
>
>           9,
>
>           18,
>
>           129
>
>         ],
>
>         "variance": 470.7100099
>
>       }
>
>     ]
>
>   }
>
> }
>
>
>
> Kindest regards Rose
>
>
> *______________________________________________________________________________________________________________________________________________________________*
>
> *From:* Andrew Bell <andrew.bell.ia at gmail.com>
> *Sent:* Tuesday, 3 August 2021 11:00 p.m.
> *To:* Rose Phillips <RPhillips at linz.govt.nz>
> *Cc:* pdal at lists.osgeo.org
> *Subject:* Re: [pdal] Attempting to filter out (1) Unclassified points
> flagged as Withheld
>
>
>
>
>
>
>
> On Mon, Aug 2, 2021 at 5:39 PM Rose Phillips <RPhillips at linz.govt.nz>
> wrote:
>
> Hi pdal’ers
>
>
>
> These are my attempts to filter out (1) Unclassified Points flagged as
> withheld in LAS filers for further analyses.
>
> Any chance you guys can point to where I have gone wrong?
>
>
>
> pipelines I have tried using pdal 2.3.0: to filter out (1) unclassified
> points flagged as withheld;
>
>
>
> 1.
>
>
>
> {
>
>     "pipeline" : [
>
>     {
>
>         "type" : "readers.las",
>
>         "filename" : "input.las"
>
>     },
>
>                 {
>
>                                 "type":"filters.range",
>
>                                 "limits":"Classification![129:129]"
>
>                 },
>
>     {
>
>         "type" : "writers.las",
>
>         "a_srs" : "EPSG:2193+7839",
>
>         "filesource_id" : "0",
>
>         "filename" : "output.las"
>
>     }
>
>     ]
>
>   }
>
>
>
> I think that this should filter out unclassified withheld points with LAS
> 1.2 and 1.3. With LAS 1.4, the withheld attribute is stored in the
> "ClassFlags" dimension, so you'll need to use boolean logic with that
> dimension and the "Classification" dimension to do what you want. You might
> also use pdal info --enumerate to make sure that your data has the values
> you think it does.
>
>
>
> --
>
> Andrew Bell
> andrew.bell.ia at gmail.com
>
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-- 
Andrew Bell
andrew.bell.ia at gmail.com
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