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

[Mathieu Basille]

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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-- 

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Mathieu Basille, Post-Doc

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Laboratoire d'Écologie Comportementale et de Conservation de la Faune
+ Centre d'Étude de la Forêt
Département de Biologie
Université Laval, Québec

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http://ase-research.org/basille

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``If you can't win by reason, go for volume.''
Calvin, by Bill Watterson.