[pdal] Filters on LiDAR data for vegetation cover

[Luigi Pirelli]

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
>>> pdal at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/pdal
>>
>>
>
> --
> ing. Silvia Franceschi
> Via Latemar, 22
> 38030 Castello di Fiemme (TN)
>
> tel: 0039 -3384501332
>
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