Pierre,
Thank you for explaining demonstarting how it could be done.
I apologise, I cannot fully understand how I would change the custom
function to suit the purpose?
Also for the Raster creation, where I would need to change the parameters to
suit, would I just change 'snow' and '2010'.
For thi
inside the custom function.
Pierre
> -Original Message-
> From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-
> boun...@postgis.refractions.net] On Behalf Of JamesH
> Sent: Wednesday, April 25, 2012 1:15 PM
> To: postgis-users@postgis.refractions.net
> Subje
e U.S.Fish and Wildlife Service or Dept. of the
Interior. Life is too short for undocumented, proprietary data formats.
JamesH
Sent by: postgis-users-boun...@postgis.refractions.net
04/25/2012 02:49 PM
Please respond to
PostGIS Users Discussion
To
postgis-users@postgis.refractions.n
"Why not convert the raster cell centers to points , do a query on the
point layer for a square centered on the raster derived point whose
dimensions are given by the number of tiles in your neighborhood. return
the number of points divided by the area of the square. ( neighborhoods
are usua
Interior. Life is too short for undocumented, proprietary data formats.
JamesH
Sent by: postgis-users-boun...@postgis.refractions.net
04/25/2012 01:15 PM
Please respond to
PostGIS Users Discussion
To
postgis-users@postgis.refractions.net
cc
Subject
[postgis-users] Simple Point Density
"SELECT st_centroid(st_collect(the_geom)), count(*)
FROM mytable
GROUP BY ST_SnapToGrid(the_geom, cellsize)"
Thank you, would you visualise this with PixelAsPolygons? I'm trying to view
it in OpenJump, trying something like:
SELECT ST_AsBinary((gv).geom, (gv).val
FROM (SELECT ST_PixelAsPolygons
On Wed, Apr 25, 2012 at 10:15:22AM -0700, JamesH wrote:
> Hi all,
>
> I am looking to take a point dataset and generate a point density raster in
> PostGIS, similar to the ArcGIS Point Density tool in Spatial Analyst.
>
> What I believe I need to do is to define a neightbourhood around each outp
Hi all,
I am looking to take a point dataset and generate a point density raster in
PostGIS, similar to the ArcGIS Point Density tool in Spatial Analyst.
What I believe I need to do is to define a neightbourhood around each output
raster cell centre and calculate a density value for each pixel ba
