[pdal] p2g density

[Matthew Hanson]

I did look at that, but assuming I understand it correctly something seems
off.

I'll send feedback to the provided email, thanks.

matt

Matthew Hanson
Applied GeoSolutions
(603) 659-3363 x91
http://appliedgeosolutions.com
mhanson at appliedgeosolutions.com


On Thu, Feb 12, 2015 at 4:05 PM, Bradley Chambers <brad.chambers at gmail.com>
wrote:

> Matthew,
>
> Have you looked at
> http://www.opentopography.org/index.php/Tools/otforge/points2grid and the
> resources linked off of it? That may be useful.
>
> I believe most of our modifications to points2grid have been to provide
> support for things like CMake, Windows, GeoTIFF, etc., and not to
> fundamentally change the underlying algorithms.
>
> Brad
>
> On Thu, Feb 12, 2015 at 2:52 PM, Matthew Hanson <
> mhanson at appliedgeosolutions.com> wrote:
>
>> Hello again,
>>
>> I'm not sure this is the right list for this question which is more about
>> points2grid, but I thought someone here might have run into this issue.
>>
>> I'm creating a tiff of point density from a las file.    My las file is
>> 1000x1000 m with about 24 million points.    I create a tiff of density
>> (den) using a grid size of 1.0x1.0 and a radius of 0.56.   Thus my search
>> area is about 1.0, the same as my grid area.
>>
>> I would expect the sum of all my points to be about equal to the total #
>> of points, and the mean pixel value to be about 24.   However it's not.   I
>> get a significantly higher total - about 37 million points and a mean of
>> about 37.     I've adjusted the search radius and it does change, but the
>> numbers are quite a bit higher in all cases than what would be expected.
>>
>> Am I misunderstanding what the density output is supposed to be?   Or has
>> someone else stumbled across this?
>>
>> Thanks,
>>
>>
>> Matthew Hanson
>> Applied GeoSolutions
>> (603) 659-3363 x91
>> http://appliedgeosolutions.com
>> mhanson at appliedgeosolutions.com
>>
>>
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>>
>
>
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