Il 09/03/2015 04:16, Mark Wynter ha scritto:
An example of how you can generate Viewsheds in PostGIS via PL/R and Grass
using a single SQL query statement.
CREATE OR REPLACE FUNCTION generate_viewshed(coordxy text) RETURNS text as
Hi all.
Please note that in GRASS7, recently released,
Very cool solution !
Could you give a better estimate of run time?
(example of DEM resolution, time?)
Cheers,
Rémi-C
2015-03-09 9:45 GMT+01:00 Paolo Cavallini cavall...@faunalia.it:
Il 09/03/2015 04:16, Mark Wynter ha scritto:
An example of how you can generate Viewsheds in PostGIS via PL/R
Grass r.viewshed is very good and fast, and plays nicely with postgis et al. We
are talking about seconds per viewshed.
You keep your DEM in grass. Then set the g.extent of the DEM raster to define
your area of interest. This is very important to get fast calculation times.
Once you've called
An example of how you can generate Viewsheds in PostGIS via PL/R and Grass
using a single SQL query statement.
CREATE OR REPLACE FUNCTION generate_viewshed(coordxy text) RETURNS text as
$$
library(spgrass6)
initGRASS(gisBase = /usr/lib/grass64/, home = tempdir(), gisDbase =
/data/grassdata/,
Hi,
I would like to calculate LOS (visibility) from a point to an area fast as
possible.
For example looking from one observation point to 1000 targets that
represents the area
The option is to use terrain existing tools such as ARC Toolbox or using
function in POSTGIS
I wander if there is an
