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

[Etienne Bellemare]

Pierre,

I'm using postgis raster to perform intersection between rasters and vector
features which are mainly derived from lidar data (which yields lots of
data). It's a scientific environment rather than a production environment.

Etienne

On Thu, Jun 9, 2011 at 12:48 PM, Javier de la Torre
<jatorre at vizzuality.com>wrote:

> 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
> >>
> >>
> >>              _______________________________________________
> >>
> >>
> >>              postgis-users mailing list
> >>
> >>
> >>              postgis-users at postgis.refractions.net
> >>
> >>
> >>
> http://postgis.refractions.net/mailman/listinfo/postgis-users
> >>
> >>
> >>
> >>      --
> >>
> >>      ~$ 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.
> >>      _______________________________________________
> >>      postgis-users mailing list
> >>      postgis-users at postgis.refractions.net
> >>      http://postgis.refractions.net/mailman/listinfo/postgis-users
> >>
> >>
> >
>
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