[pdal] PDAL 1.8.0: filters.smrf: No returns to process.

[Bradley Chambers]

Robert,

Does the input have return information (number, etc.)? If it does, but
there are no last or only returns for some reason, then smrf would have
nothing to work with. There is a workaround if that's the case.

Are you running with '--verbose 5'? I think that should give you some
information as to how many points are making it to smrf from earlier
stages. I didn't see anything that would cause them to be dropped on their
way, but who knows.

Brad

On Sat, Jan 19, 2019, 11:16 AM Robert Dzur <rdzur at bhinc.com wrote:

> Hi List,
>
>
> I've be running into some trouble getting filters.smrf to run on a LAS
> file on pdal 1.8.0 (OS X brew install).
>
>
> Running the following command:
>
>
> pdal pipeline denoise_classify_sample9_1ft.json \
>
> --readers.las.filename=Day_5/TrackZ_S_20181014_183948_Profiler.zfs_7.las \
>
>
> --writers.las.filename=ALL_LAS/Day_5/TrackZ_S_20181014_183948_Profiler.zfs_7_smrf_9.las
>
>
> fails to write a point cloud and reports the following:
>
>
> PDAL: filters.smrf: No returns to process.
>
>
> I have run this same command on another machine that has pdal 1.7.2 (OS X
> brew install) which successfully completes and writes the resulting point
> cloud as expected.
>
>
> I'm wondering if anyone may have any pointers regarding how I might get
> filters.smrf to run in 1.8.0. on these data.  Incidentally, I have been
> able to successfully apply the same json file to airborne las data in
> 1.8.0.  I'm somewhat confused about what might be the issue with the point
> cloud file in 1.8 where it fails versus 1.7.2 where the file processes
> correctly.
>
>
> Contents of the json file follow:
>
>
> {
> "pipeline": [
> {
> "type" : "readers.las",
> "filename" : "file.las"
> },
> {
> "type":"filters.assign",
> "assignment" : "Classification[0:20]=0"
> },
> {
> "type": "filters.outlier",
> "method": "statistical",
> "multiplier":4,
> "mean_k": 12
> },
> {
> "type":"filters.smrf",
> "cell":1.00,
> "scalar":0.0,
> "slope":0.06,
> "threshold":1.05,
> "window":49.0,
> "cut":0.0
> },
> {
> "type": "writers.las",
> "compression": "false",
> "a_srs": "EPSG:6531+6360",
> "minor_version": "2",
> "forward": "all",
> "filename":"outfile.las"
> }
> ]
> }
>
> Thanks for any assistance in this matter.
>
>
> Best
>
> --
>
> Rob Dzur
>
> rdzur at bhinc.com
>
>
>
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