ossim-viewshed(1) ossim-viewshed

SYNOPSIS

ossim-viewshed [,options/] ,<obs_lat> <obs_lon> <output-image>/

OPTIONS

--dem <filename>
Specifies the input DEM filename. If none provided, the elevation database is referenced as specified in prefs file
--disable-elev
Will disable the elevation
--disable-notify
Takes an argument. Arguments are ALL, WARN, NOTICE, INFO, FATAL, DEBUG. If you want multiple disables then just do multiple --disable-notify on the command line. All argument are case insensitive. Default is all are enabled.
--disable-plugin
Will disable the plugin loader
--fov <start> <end>
Optional arguments specifying the field-of-view boundary azimuths (in degrees). By default, a 360 deg FOV is computed. The arc is taken clockwise from start to end, so for a FOV of 225 deg from W, through N to SE, start=270 and end=135
--gsd <meters>
Specifies output GSD in meters. Defaults to the same resolution as input DEM.
--hgt-of-eye <meters>
Specifies the observers height-of-eye above the terrain in meters. Defaults to 1.5 m.
--horizon <filename>
Experimental. Outputs the max elevation angles for all azimuths to <filename>, for horizon profiling.
--lut <filename>
Specifies the optional lookup table filename for mapping the single-band output image to an RGB. The LUT provided must be in the ossimIndexToRgbLutFilter format and must handle the three output viewshed values (see --values option).
--ossim-logfile
takes a logfile as an argument. All output messages are redirected to the specified log file. By default there is no log file and all messages are enabled.
--radius <meters>
Specifies max visibility in meters. Required unless --size is specified. This option constrains output to a circle, similar to a radar display
--request-api
Causes applications API to be output as JSON to stdout. Accepts optional filename to store JSON output.
--reticle <int>
Specifies the size of the reticle at the observerlocation in pixels from the center (i.e., the radius of the reticle). Defaults to 2. A value of 0 hides the reticle. See --values option for setting reticle color.
--simulation
For engineering/debug purposes
--size <int>
Instead of a visibility radius, directly specifies the dimensions of the output product in pixels (output is square). Required unless --radius is specified.
--summary
Causes a product summary to be output to the console.
--tbs
"Thread By Sector". For engineering/debug purposes
--threads <n>
Number of threads. Defaults to use all available cores. For engineering/debug purposes
--values <int int int>
Specifies the pixel values (0-255) for the visible, hidden and reticle pixels, respectively. Defaults to visible=null (0), hidden=128, and observer position reticle is highlighted with 255.
-K
specify individual keywords to add to the preferences keyword list: name=value
-P
specify a preference file to load
-T
specify the classes to trace, ex: ossimInit|ossimImage.* will trace ossimInit and all ossimImage classes

Computes the viewshed for the given viewpt coordinates. The output is a binary image with 0 representing hidden points, and 1 representing visible points.

EXAMPLES

ossim-viewshed --radius 50
28.0 -80.5 output-hlz.tif
ossim-viewshed --size 1024
28.0 -80.5 output-hlz.tif

An alternate command line provides switch for observer lat and lon:

ossim-viewshed --rlz 25 --observer 28.0 -80.5
output-hlz.tif