Radial Line Of Sight And Range (Defense)

Available with 3D Analyst license.

Summary

Shows areas visible to one or more observer locations given a specified distance and viewing angle.

Usage

• When added to the map, the output areas visible to the observer will be green, and areas not visible will be red.

• The tool generates a range fan polygon feature class representing the entire area covered by observer parameters.

Syntax

RadialLineOfSightAndRange(in_observer_features, in_surface, out_viewshed_feature_class, out_fov_feature_class, out_range_radius_feature_class, {observer_height_offset}, {inner_radius}, {outer_radius}, {horizontal_start_angle}, {horizontal_end_angle})

Parameter	Explanation	Data Type
in_observer_features	The input observer points.	Feature Set
in_surface	The input elevation raster surface. The elevation surface must be projected.	Raster Layer
out_viewshed_feature_class	The output polygon feature class showing visible and nonvisible areas.	Feature Class
out_fov_feature_class	The output polygon feature class containing the field of view range fan.	Feature Class
out_range_radius_feature_class	The output polygon feature class containing the viewing sector created by the range radius, start angle, and end angle.	Feature Class
observer_height_offset (Optional)	The height added to the surface elevation of the observer. The default is 2.	Double
inner_radius (Optional)	The minimum (nearest) distance from observers to consider for analysis in meters. The default is 1000.	Double
outer_radius (Optional)	The maximum (farthest) distance from observers to consider for analysis in meters. The default is 3000.	Double
horizontal_start_angle (Optional)	The left bearing limit in degrees. The default is 0.	Double
horizontal_end_angle (Optional)	The right bearing limit in degrees. The default is 360.	Double

Code sample

RadialLineOfSightAndRange example 1 (Python window)

The following Python window script demonstrates how to use theRadialLineOfSightAndRange function.

import arcpy
arcpy.env.workspace = r"C:/Data.gdb"
arcpy.RadialLineOfSightAndRange_defense("LLOS_Tar", "n36.dt2",
                                        "Viewshed", "FieldOfView",
                                        "Range",
                                        2, 1000, 3000, 0, 360)

RadialLineOfSightAndRange example 2 (stand-alone script)

The following example uses the RadialLineOfSightAndRange function in a sample workflow script.

# Description: Create Radial Line of Sight and Range to test siting of an antenna 
# antennas

# Import system modules
import arcpy

# Set environment settings
arcpy.env.workspace = r"C:/Data.gdb"

# Select antenna to test
antenna_layer = "antennas"
whereClause = "antenna_call_sign = 'KJT'"
test_ant_layer = arcpy.MakeFeatureLayer_management(antenna_layer, whereClause)

# Inputs
input_surface = "n36.dt2"

# Create radial line of sight for antennas
arcpy.RadialLineOfSightAndRange_defense(test_obs_layer, input_surface, 
                                        "Viewshed", "FieldOfView", "Range", 
                                        2, 1000, 3000, 0, 360)

Environments

This tool does not use any geoprocessing environments.

Licensing information

• Basic: Yes
• Standard: Yes
• Advanced: Yes