Umwandlung von Vektor- in Rasterdaten

Um die Vektorlinie in eine Rasterdatei umzuwandeln, verwendet man v.to.rast, nachdem man mit v.support mask die von GRASS benötigten weiteren Dateien erzeugt. Die Frage nach den im Speicher zu haltenen Zeilen kann mit 512 bestätigt werden.

GRASS:~GRASS:/spare/gisdata/grass/bin > v.support mask

   V.SUPPORT:

Selected information from vector header
 Organization:
 Map Name:
 Source Date:
 Orig. Scale:   0
 No snapping will be done

    Reading Vector file.
 100%
    Building areas
    Building islands
    Attaching labels
 Number of lines:   1
 Number of nodes:   1
 Number of areas:   1
 Number of isles:   1
 Number of atts :   0
 Number of unattached atts :   0
 Snapped lines  :   0

GRASS:/spare/gisdata/grass/bin > v.to.rast
OPTION:   vector input file
key: input
required: YES

Enter the name of an existing vector file
Enter 'list' for a list of existing vector files
Hit RETURN to cancel request
> mask

Enter a new raster file name
Enter 'list' for a list of existing raster files
Hit RETURN to cancel request
> mask

Parameters:
input   vector input file
output   raster output file
rows   number of rows to hold in memory
default: 512
required: NO
enter option >
Loading vector information ...                  0 mins 00 secs
Sorting areas by size ... 1 areas               0 mins 00 secs
Pass #1 (of 2)
  Processing areas ... 1 areas                  0 mins 00 secs
  Processing lines ... 0 lines                  0 mins 00 secs
  Processing sites ... 0 sites                  0 mins 00 secs
  Writing raster map ...                        0 mins 00 secs
Pass #2 (of 2)
  Processing areas ... 1 areas                  0 mins 00 secs
  Writing raster map ...                        0 mins 00 secs
Creating support files for raster map ...       0 mins 01 sec

Raster map <mask> done.
Total processing time:    0 mins 01 sec

Die Maske selbst wird mit dem Befehl r.mask gesetzt, der alternativ auch Masken entfernt. Die erfolgte Maskierung erzeugt eine Rasterdatei MASK die mit d.rast -o map=MASK angezeigt werden kann.

GRASS:/spare/gisdata/grass/bin > r.mask mask

MASK:  Program for managing current GIS mask

current mask:          none

Options:
    1      Remove the current mask
    2      Identify a new mask
  RETURN   Exit program

>2

Enter name of data layer to be used for mask
Enter 'list' for a list of existing raster files
Enter 'list -f' for a list with titles
Hit RETURN to cancel request

>mask

IDENTIFY THOSE CATEGORIES TO BE INCLUDED IN THE MASK

OLD CATEGORY NAME                                          CAT
                                                           NUM

. . . . . . . . . . . . . . . . . . . . . . . . . .   0     0_
. . . . . . . . . . . . . . . . . . . . . . . . . .   1     1_

     Next category: end__  (0 thru 1)

AFTER COMPLETING ALL ANSWERS, HIT <ESC><ENTER> TO CONTINUE
                  (OR <Ctrl-C> TO CANCEL)