[pdal] Filters on LiDAR data for vegetation cover

[Bradley Chambers]

Correct, there is no PDAL filter to isolate vegetation points amongst those
classified as non-ground. Other filters, as suggested, may help to
discriminate between buildings and trees, or misclassified non-ground. I've
not done a lot of dense vegetation testing, but both PMF and SMRF should do
reasonably well as long as points are making it all the way to the ground
in the input data. Those filters, in my experience, struggle more with
manmade structures than they do with vegetation.

On Wed, Apr 10, 2019, 7:30 AM Luigi Pirelli <luipir at gmail.com> wrote:

> I would say to filter later hag to remove spikes and isolated maximum, e.g
> fopr example nndistance (in 1.9) help to remove last return points that
> belongs to trees
>
> just my 2c
>
> Luigi Pirelli
>
>
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> On Wed, 10 Apr 2019 at 13:22, Silvia Franceschi <
> silvia.franceschi at gmail.com> wrote:
>
>> Thanks Luigi,
>> it is exactly what I am doing, but regarding filters, I noticed that
>> there are many other filters and I was wondering if there were something
>> else to use specifically for vegetation or dense cover.
>>
>> I am also reading some papers, it is hard to find specific tests on
>> vegetation, the buildings seems to be more interesting!!! :-D
>>
>> Hear you soon!!
>> Ciao
>>
>> Silvia
>>
>>
>> On Wed, Apr 10, 2019 at 12:47 PM Luigi Pirelli <luipir at gmail.com> wrote:
>>
>>> Hi silvia
>>>
>>> with my limitated experience in this area I would do
>>>
>>> 1) filter only last points
>>> 2) filter with pmf or smpf... and here you have to play with parameters
>>> reading experience, there is no a generic set of parameters, because
>>> they depend on the size of objects you want to "remove", sensor noise,
>>> terain conformation and point of view espect the terrain
>>>
>>> => you have to check the parameters :(
>>>
>>> you can read may papers related with pmf... no idea about papers
>>> specific to high vegetation cover.
>>>
>>> cheers
>>>
>>> Luigi Pirelli
>>>
>>>
>>> **************************************************************************************************
>>> * LinkedIn: https://www.linkedin.com/in/luigipirelli
>>> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
>>> * GitHub: https://github.com/luipir
>>> * Mastering QGIS 2nd Edition:
>>> *
>>> https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition
>>> * Hire me: http://goo.gl/BYRQKg
>>>
>>> **************************************************************************************************
>>>
>>>
>>> On Wed, 10 Apr 2019 at 12:02, Silvia Franceschi <
>>> silvia.franceschi at gmail.com> wrote:
>>>
>>>> Dear all,
>>>> is there someone who is working with point cloud data to extract the
>>>> DTM in areas with high vegetation cover?
>>>> Do you have experience on which of the different filters available in
>>>> the PDAL is better to use? which values of the parameters did you use?
>>>>
>>>> Do you know if there are papers available on applications on these use
>>>> cases?
>>>>
>>>> Any suggestion is appreciated! :-D
>>>>
>>>> Regards
>>>>
>>>> Silvia
>>>>
>>>>
>>>>
>>>> --
>>>> ing. Silvia Franceschi
>>>> Via Latemar, 22
>>>> 38030 Castello di Fiemme (TN)
>>>>
>>>> tel: 0039 -3384501332
>>>> _______________________________________________
>>>> pdal mailing list
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>>>
>>>
>>
>> --
>> ing. Silvia Franceschi
>> Via Latemar, 22
>> 38030 Castello di Fiemme (TN)
>>
>> tel: 0039 -3384501332
>>
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