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

[Javier de la Torre]

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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