[pdal] Extract terrain from TLS point cloud
Silvia Franceschi
silvia.franceschi at gmail.com
Sat May 11 01:01:13 PDT 2019
Dear all,
I am trying to extract the ground points from a point cloud of a
terrestrial laser scanner (TLS) in a forestry environment, but the result
is not so good as the one I got using data from ALS.
What I did is:
1. denoise the dataset using the filter.outlier and a filter.range for Z
ranges:
"type": "filters.outlier",
"method": "statistical",
"multiplier": 3,
"mean_k": 8
2. apply a filter.elm and a filter.smrf to the cleaned dataset
For the SMRF filter I used these parameters:
"type": "filters.smrf",
"slope":0.2,
"window":16,
"threshold":0.45,
"scalar":1.2
Unfortunately the resulting ground points contain also the first part of of
the trunks of the trees, how is it possible?
I am doing some testing changing the values of the SMRF parameters but the
results are almost the same.
Do some of you have experience with such kind of data? Am I missing some
operation for filtering? Could you please help me understanding at least
where to focus the attention to try to obtain something...
Thank you in advance.
Silvia
--
ing. Silvia Franceschi
Via Roma, 64
38030 Castello di Fiemme (TN)
tel: 0039 -3384501332
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