[Mapserver-users] grass from mapscript with system()-call?

[Lowell Filak]

Have you thought of possibly adding your setup information to the wiki?
Maybe even provide a download of the setup similar to SlideLinks.
One way to solve a lot of the questions posted for MapServer (ie., buffering) is to have GRASS in the background doing things such as taking a given shape(file) and buffering it or doing some sort of analysis and then creating a  shapefile, or GRASS raster as a result and then MapServer could incorporate the result.
Lowell F.

The following message was sent by "Matt Doggett" <mdoggett at coas.oregonstate.edu> on Tue, 27 May 2003 12:28:27 -0700.

> I'm doing exactly what you are after and have succeeded (finally!).
> However, I think my method is a little different. What I do (from my
> mapserver app) is call a CGI script which (after doing some other stuff)
> calls a couple of Grass scripts that do the calculations.  I have a
> subroutine (Grass_Init) which initializes the Grass environment to the
> specified database, location, and mapset. At some point in the process,
> this subroutine is called, after which the script can run any grass
> command simply by running a system command. E.g. (in Perl):
> System "r.mapcalc \'newgrid=sin(A)+cos(B)\'";
> If you can't get anywhere with your method, maybe this will help.
> 
> -Matt
> 
> 
> 
> #/***************************************
> # Usage:  Grass_Init( Grass_Database, Location, Mapset);
> # Sets up a GRASS environment and creates a GISRC file.
> # Returns the name of the GISRC file created.
> sub Grass_Init {
>     my ($GISDBASE,$LOCATION_NAME,$MAPSET) = @_;
> 		   die "Usage: Grass_Init( Grass_Database, Location,
> Mapset)!"  if (@_<3);
> 			         
>     my $GISBASE="/usr/local/grass5";
>     my $GISRC = "/tmp/.grassrc.$$";
>     my $ETC = "$GISBASE/etc";
>     my $PATH ="$GISBASE/bin:$GISBASE/scripts:$GISBASE/garden/bin";
>     my $LOCATION = "$GISDBASE/$LOCATION_NAME/$MAPSET";
>     
>     # Setup environment variables GRASS requires
>     $ENV {'GISBASE'}= $GISBASE;
>     $ENV {'GISRC'} = $GISRC;
>     $ENV {'ETC'}= $ETC;
>     $ENV {'PATH'}= "$PATH:$ENV{'PATH'}" if (index($ENV{'PATH'},$GISBASE)
> < 0); 
>     $ENV {'LOCATION_NAME'}=$LOCATION_NAME;
>     $ENV {'MAPSET'} = $MAPSET;
>     $ENV {'LOCATION'} = $LOCATION;
>     
>     # Create .grassrc file #
> 	  open (RC,">$GISRC")
> 		  or die "Error opening $GISRC! $!";
>     print RC <<EOF;
> GISDBASE: $GISDBASE
> LOCATION_NAME: $LOCATION_NAME
> MAPSET: $MAPSET
> GISLIB: $GISBASE/src/libes/gis
> VECT_INCLUDE: $GISBASE/src/mapdev/Vlib
> XDRIVER_HEIGHT: 480
> XDRIVER_WIDTH:  640
> EOF
>     
>     close RC;
> 		print "GRASS initialized using $GISRC.\n";
> 		return $GISRC;
> }#end Grass_Init
> 
> 
> 
> > -----Original Message-----
> > From: mapserver-users-admin at lists.gis.umn.edu [mailto:mapserver-users-
> > admin at lists.gis.umn.edu] On Behalf Of Stephan Holl
> > Sent: Saturday, May 24, 2003 3:54 AM
> > To: mapserver-users
> > Subject: [Mapserver-users] grass from mapscript with system()-call?
> > 
> > Dear list,
> > 
> > I am struggling around  with starting a non-interactive session of
> > grass, which should produce some raster-maps.
> > these maps should then be added to the running mapserver.
> > The Idea is to perform some calculations with r.mapcalc directly in
> the
> > browser.
> > whenever I start grass with
> > 
> > system("SHELL=./grass_commands.sh ; /path/where/grass/lives/grass5
> > testlocation/PERMANENT ; SHELL=/bin/sh");
> > 
> > the output says, that grass is already in use from the apache-user....
> > does anybody how to solve this?
> > 
> > 
> > Thank you.
> > 
> > cheers
> >  Stephan Holl
> > --
> > Stephan Holl
> > 
> > GnuPG Key-ID: 11946A09
> 
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