[postgis-users] How do you use PostGIS Raster?

[Javier de la Torre]

Now we are using an open source software called starspan. It actually works pretty well.

What we do is have a server with the raster and a web server exposing an API. It accepts a polygon as geojson and in command line calculate the vsum of the carbon value using starspan.

In PostGIS we could do many more things like intersections and stuff like this before calculating the sum of the raster value. We could stored polygons and with simple sql statements calculate their values... well lot more flexibility in general.

Best,


On Jun 9, 2011, at 9:29 AM, Pierre Racine wrote:

> Thanks Javier,
> 
> Nice application. What do you use now and why do you plan on using PostGIS? Is it possible to upload a shapefile and get the carbon sequestrated for the area covered by the shapefile?
> 
> Pierre
> 
>> -----Original Message-----
>> From: Javier de la Torre [mailto:jatorre at vizzuality.com]
>> Sent: Thursday, June 09, 2011 3:42 AM
>> To: PostGIS Users Discussion
>> Cc: Marie-Cla at lists.refractions.net; Pierre Racine; ude Labbé
>> Subject: Re: [postgis-users] How do you use PostGIS Raster?
>> 
>> Hi,
>> 
>> We are planning on using it to calculate carbon sequestration on protected
>> areas. This is a project by the Convention on Biological Diversity
>> 
>> http://www.cbd.int/lifeweb/carbon/
>> 
>> It basically is an intersection of a raster with bit vectors.
>> 
>> Best,
>> 
>> Javier.
>> 
>> 
>> On Jun 8, 2011, at 10:09 PM, Mathieu Basille wrote:
>> 
>> 
>> 	Dear Pierre,
>> 
>> 	Here, we are using PostGIS to analyze large datasets combining rasters
>> and vectors. Basically, we are looking at movement and habitat selection in a
>> predator-prey system, using GPS-collar data over large areas. The major use of
>> PostGIS Raster is for the intersection of prey steps (line segments or buffers
>> around these segments) with different raster: Landsat (landcover type), slope,
>> road density, relative probability of occurrence of the predator, etc. Note that
>> we first tried to use ArcGIS for this step, without success, due to many bugs and
>> the need to correct them by hand (which was largely too time-consuming). We
>> also used PostGIS Raster to intersect predator locations with the Landsat map to
>> estimate Resource Selection Functions (RSF) in order to build maps of relative
>> probability of occurrence. In the end, information of the intersections were used
>> in R to characterize movements of the preys on the landscape.
>> 
>> 	Best,
>> 	Mathieu Basille.
>> 
>> 
>> 	Le 03/06/2011 08:28, Pierre Racine a écrit :
>> 
>> 
>> 		Hi all,
>> 
>> 
>> 
>> 		I'm preparing a presentation and I need some use cases for
>> PostGIS Raster. I would be grateful if people already using the raster side of
>> PostGIS would describe what they already do it. Bborie, Jorge, Regina, others?
>> These uses cases are vital for the project.
>> 
>> 
>> 
>> 		On my side we are using PostGIS raster to do raster/vector
>> analysis over large datasets. Basically determining mean values for temperature
>> (raster), elevation (raster) for fauna observations (point buffers). Converting
>> everything to vector and using desktop solutions proved impracticable for
>> datasets covering the extent of Canada.
>> 
>> 
>> 
>> 		For those who did not try the raster extension yet, don't be shy
>> to express your planned experiments or your expectations.
>> 
>> 
>> 
>> 		Thanks all for your contribution to the project,
>> 
>> 
>> 
>> 		Pierre
>> 
>> 
>> 		_______________________________________________
>> 
>> 
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>> 
>> 
>> 	--
>> 
>> 	~$ whoami
>> 	Mathieu Basille, Post-Doc
>> 
>> 	~$ locate
>> 	Laboratoire d'Écologie Comportementale et de Conservation de la
>> Faune
>> 	+ Centre d'Étude de la Forêt
>> 	Département de Biologie
>> 	Université Laval, Québec
>> 
>> 	~$ info
>> 	http://ase-research.org/basille
>> 
>> 	~$ fortune
>> 	``If you can't win by reason, go for volume.''
>> 	Calvin, by Bill Watterson.
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>> 
>