The program can be run either non-interactively or interactively. To run r.los non-interactively, the user must specify at least an input file name, output file name, and the geographic coordinates of the user's viewing location on the command line; any remaining parameters whose values are unspecified on the command line will be set to their default values (see below).
The patt_map is the name of a binary (1/0) raster map layer in which
cells within the areas of interest are assigned the category value '1', and
all other cells are assigned the category value '0'. If this parameter is
omitted, the analysis will be performed for the whole area within a certain
distance of the viewing point inside the geographic region boundaries.
Default: assign all cells that are within the
max_dist and within the user's current geographic
region boundaries a value of 1.
The obs_elev= parameter defines the height of the observer (in
meters) above the viewing point's elevation.
Default: 1.75 (meters)
The max_dist= parameter is the maximum distance (in meters) from the
viewing point inside of which the line of sight analysis will be performed.
The cells outside this distance range are assigned the category value '0'.
Options: 0-99999 (stated in map units)
Default: 1000
It is advisable to use a 'pattern layer' which identifies the areas of interest in which the line of sight analysis is required. Such a measure will reduce the time taken by the program to run.
Last changed: $Date: 2003/05/06 13:58:46 $