[pdal] p2g density

[Bradley Chambers]

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
>
>
> _______________________________________________
> pdal mailing list
> pdal at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/pdal
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/pdal/attachments/20150212/3fb935a4/attachment.html>