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 <jato...@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:jato...@vizzuality.com] > >> Sent: Thursday, June 09, 2011 3:42 AM > >> To: PostGIS Users Discussion > >> Cc: marie-...@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@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@postgis.refractions.net > >> http://postgis.refractions.net/mailman/listinfo/postgis-users > >> > >> > > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users >
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