[pdal] pdal pipeline error

[Howard Butler]

Thanks for the data.

PDAL filters.crop doesn't first buffer the point and then do point in polygon on that buffered polygon. It instead computes the circular (2d) or spherical (3d) distance. See https://github.com/PDAL/PDAL/blob/master/filters/CropFilter.cpp#L255 <https://github.com/PDAL/PDAL/blob/master/filters/CropFilter.cpp#L255> for more information on what's done. 

If you want to use a buffer, you'll need to pass one explicitly. 

Presumably, this is the reason for the discrepancy. I will update our docs to be more explicit about this behavior.

Howard


> On Oct 3, 2017, at 8:40 AM, Howard Butler <howard at hobu.co> wrote:
> 
> Can you post example data? Presumably there is an issue with how the buffer is generated from the point.
> 
> Howard
> 
>> On Oct 3, 2017, at 8:38 AM, Giuseppe Falcone <falcone.giuseppe at gmail.com <mailto:falcone.giuseppe at gmail.com>> wrote:
>> 
>> Hi to all,
>> 
>> I have a problem with a simple pdal pipeline.
>> I have to filter point from las file that are into a 13m radius buffer from given point.
>> 
>> json = u'''
>> {
>>   "pipeline":[
>>     "data.las",
>>     {
>>       "distance": 13,
>>       "type": "filters.crop",
>>       "point": "POINT(626715,4481770,155)"
>>     }
>> }''
>> 
>> p = pdal.Pipeline(json)
>> p.validate() 
>> p.loglevel = 4
>> count = p.execute()
>> data = p.arrays[0]
>> 
>> data is an array of 5321 element.
>> 
>> If I elaborate data with arcmap (view las data a clip with circle),
>> I have 6203 element into point buffer.
>> I rewrite same code with R and I have also 6203 element as intersection result.
>> 
>> Where is the error with pdal pipeline?
>> I have compiled pdal 1.5.0 with pcl 1.8.1 on ubuntu 16.04 LTS and using it with python 2.7.12
>> 
>> Thanks.
>> 
>> Giuseppe
>> 
>> 
>> _______________________________________________
>> pdal mailing list
>> pdal at lists.osgeo.org <mailto:pdal at lists.osgeo.org>
>> https://lists.osgeo.org/mailman/listinfo/pdal
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/pdal/attachments/20171003/413a77cf/attachment-0001.html>