Just to follow up on this, here is the code we (Abdel-Rahman M. Muhsen and I)
finally got around to writing. We found a function called randompoint which
just creates random points within the bounding box of the geometry from
Alexandre Sorokine.
On Fri, May 27, 2011 at 10:53:58AM -0600, John Abraham wrote:
create or replace view dot_cnt as
select the_geom, polygon_id, (quantity_column/100)::integer as numpoints
from original_data;
select dot_density('dot_cnt',
'the_geom',
'polygon_id',
'numpoints');
alter table dp
AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin
Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job
-
From: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On
Behalf Of Martin Davis
Sent: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin
Davis
Subject: Re: [postgis-users] Dot Density idea
I
[mailto:postgis-users-boun...@postgis.refractions.net] On
Behalf Of Martin Davis
Sent: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin
Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote
Abraham; postgis-users@postgis.refractions.net; Martin Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk
: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On
Behalf Of Martin Davis
Sent: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking
On Mon, May 03, 2010 at 10:49:32PM -0600, John Abraham wrote:
One of the things I miss about using ESRI's GIS is the ability to do
dot-density maps. Within a polygon, the number of dots is proportional to a
value, and the dots are randomly placed. I find it useful to be able to
present
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk;
On Mon, May 03, 2010 at 10:49:32PM -0600, John Abraham wrote:
One of the things I miss about using ESRI's GIS is the ability to do
dot-density maps. Within a
Not quite the same, but Carson Farmer's fTools plugins for QGIS
include the functionality to create random points (by count or
density) inside of a polygon.
http://www.ftools.ca/plugins.html Nothing specific about this
functionality on this page, you need to look at the actual plugins in
QGIS.
I have used an R function before (using maptools package) to do something
similar, but I can't remember the details, so I would be considering looking at
PL/R.
cheers
Ben
On 06/05/2010, at 15:40 , strk wrote:
On Mon, May 03, 2010 at 10:49:32PM -0600, John Abraham wrote:
One of the things
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk;
On Mon, May 03, 2010 at 10:49:32PM -0600, John Abraham wrote:
One of the things I miss about using ESRI's GIS is the
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk;
On Mon, May 03, 2010 at 10:49:32PM -0600, John Abraham wrote
-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On
Behalf Of Martin Davis
Sent: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing
: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like
; Martin Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk;
On Mon, May 03, 2010 at 10:49:32PM -0600, John
: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk;
On Mon, May 03, 2010 at 10:49:32PM -0600, John Abraham wrote
: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk;
On Mon, May 03, 2010 at 10:49:32PM -0600, John Abraham wrote
06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin
Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an
interesting
function indeed. Sounds like a good
: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On
Behalf Of Martin Davis
Sent: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin
Davis
Subject: Re: [postgis-users] Dot Density idea
I
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry,
numpoints) would be an interesting
Doesn't OpenSource suck!!!
On Mon, May 3, 2010 at 11:49 PM, John Abraham jabra...@ucalgary.ca wrote:
One of the things I miss about using ESRI's GIS is the ability to do
dot-density maps. Within a polygon, the number of dots is
An then an hour later...
Yea, this is very cool indeed.
George
On Thu, May 6, 2010 at 3:33 PM, David Fawcett david.fawc...@gmail.comwrote:
Doesn't OpenSource suck!!!
On Mon, May 3, 2010 at 11:49 PM, John Abraham jabra...@ucalgary.ca
wrote:
One of the things I miss about using ESRI's GIS is the ability to do
Davis mbda...@refractions.net wrote:
From: Martin Davis mbda...@refractions.net
Subject: Re: [postgis-users] Dot Density idea
To: PostGIS Users Discussion postgis-users@postgis.refractions.net
Date: Friday, May 7, 2010, 5:50 AM
Did your algorithm work with
irregular polgon extents?
Jan
...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On
Behalf Of Martin Davis
Sent: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote
@postgis.refractions.net; Martin Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote:
ST_RandomPoinsOnSurface(geometry, numpoints) would be an interesting
function indeed. Sounds like a good job for GEOS/JTS.
--strk;
On Mon, May 03, 2010 at 10:49:32PM -0600, John
[mailto:postgis-users-boun...@postgis.refractions.net] On
Behalf Of Martin Davis
Sent: Thursday, May 06, 2010 8:56 AM
To: John Abraham; postgis-users@postgis.refractions.net; Martin
Davis
Subject: Re: [postgis-users] Dot Density idea
I was thinking the same thing!
strk wrote
One of the things I miss about using ESRI's GIS is the ability to do
dot-density maps. Within a polygon, the number of dots is proportional to a
value, and the dots are randomly placed. I find it useful to be able to
present several data values at once (e.g. blue dots for population, red dots
28 matches
Mail list logo
