Generate Range Rings From Lookup Table (Defense)

Summary

Creates a set of concentric circles from a center based on values stored in a lookup table.

Usage

• The Range Ring Type parameter is used to determine whether rings will be created from an interval and number of rings or a minimum and maximum distance. These two range ring types are described as follows:

  • Generating range rings from an interval means you will specify the number of rings to create. The first ring will be a distance from the center point that you specify and each subsequent ring will be created that same distance from the previous ring.
  • Generating range rings from a minimum and maximum distance means you will specify two values, a minimum and maximum. One ring will be created for each value at the specified distance from the center.

• Range ring values, either interval or minimum and maximum distance, must be stored in a table as follows:

  • The table used to create range rings from an interval must contain a minimum of one row with the following three fields:
    • A text field containing a lookup name that will be used to choose the row containing the values for the interval and the number of rings to be created. The default field name is Name.
    • A long, short, double, or float field containing a value for the interval at which rings will be created. The default field name is Intervals.
    • A long, short, or integer field containing a value for the number of rings to be created. The default field name is Rings.
  • The table used to create range rings from minimum and maximum distances must contain a minimum of one row with the following three fields:
    • A text field containing a lookup name that will be used to choose the row containing the values for the minimum and maximum distances at which rings will be created. The default field name is Name.
    • A long, short, double, or float field containing a value for the minimum distance at which a ring will be created. The default field name is Min.
    • A long, short, double, or float field containing a value for the maximum distance at which a ring will be created. The default field name is Max.

Parameters

Dialog

Label	Explanation	Data Type
Input Features (Center Points)	The point feature set that identifies the center of the range ring. The input must have at least one point.	Feature Set
Input Lookup Table	The input table that contains values for creating rings.	Table
Output Feature Class (Rings)	The output feature class containing the ring features.	Feature Class
Selected Name	The row from the Input Lookup Table that contains the input values for minimum and maximum values or number of rings and interval.	String
Range Ring Type	Specifies the method used to create the range rings. Interval—Range rings will be generated based on the number of rings and distance between rings. This the default. Minimum and maximum—Range rings will be generated based on a minimum and maximum distance.	String
Output Feature Class (Radials) (Optional)	The feature class containing the output radial features.	Feature Class
Number of Radials (Optional)	The number of radials to create.	Long
Distance Units (Optional)	Specifies the linear unit of measurement for the Ring Interval Field parameter or the Input Table Minimum Range and Input Table Maximum Range parameters. Meters—The unit will be meters. This is the default. Kilometers—The unit will be kilometers. Miles—The unit will be miles. Nautical miles—The unit will be nautical miles. Feet—The unit will be feet. US survey feet—The unit will be U.S. survey feet.	String
Input Table Selected Name Field (Optional)	The field from the input table that contains the Selected Name value. The default field name is Name.	Field
Input Table Minimum Range (Optional)	The field from the input table that contains the minimum range value. The default field name is Min.	Field
Input Table Maximum Range (Optional)	The field from the input table that contains the maximum range value. The default field name is Max.	Field
Number of Rings Field (Optional)	The field from the input table that contains the number of rings value. The default field name is Rings.	Field
Ring Interval Field (Optional)	The field from the input table that contains the ring interval value. The default field name is Interval.	Field

Python

arcpy.defense.GenerateRangeRingsFromTable(in_features, in_table, out_feature_class_rings, lookup_name, range_rings_type, {out_feature_class_radials}, {number_of_radials}, {distance_units}, {lookup_name_field}, {min_range_field}, {max_range_field}, {number_of_rings_field}, {ring_interval_field})

Name	Explanation	Data Type
in_features	The point feature set that identifies the center of the range ring. The input must have at least one point.	Feature Set
in_table	The input table that contains values for creating rings.	Table
out_feature_class_rings	The output feature class containing the ring features.	Feature Class
lookup_name	The row from the in_table that contains the input values for minimum and maximum values or number of rings and interval.	String
range_rings_type	Specifies the method used to create the range rings. INTERVAL—Range rings will be generated based on the number of rings and distance between rings. This the default. MIN_MAX—Range rings will be generated based on a minimum and maximum distance.	String
out_feature_class_radials (Optional)	The feature class containing the output radial features.	Feature Class
number_of_radials (Optional)	The number of radials to create.	Long
distance_units (Optional)	Specifies the linear unit of measurement for the ring_interval_field parameter or the min_range_field and max_range_field parameters. METERS—The unit will be meters. This is the default. KILOMETERS—The unit will be kilometers. MILES—The unit will be miles. NAUTICAL_MILES—The unit will be nautical miles. FEET—The unit will be feet. US_SURVEY_FEET—The unit will be U.S. survey feet.	String
lookup_name_field (Optional)	The field from the input table that contains the lookup_name value. The default field name is Name.	Field
min_range_field (Optional)	The field from the input table that contains the minimum range value. The default field name is Min.	Field
max_range_field (Optional)	The field from the input table that contains the maximum range value. The default field name is Max.	Field
number_of_rings_field (Optional)	The field from the input table that contains the number of rings value. The default field name is Rings.	Field
ring_interval_field (Optional)	The field from the input table that contains the ring interval value. The default field name is Interval.	Field

Code sample

GenerateRangeRingsFromTable example 1 (Python window)

The following Python window script demonstrates how to use the GenerateRangeRingsFromTable function.

import arcpy
arcpy.env.workspace = r"C:/Data.gdb"
arcpy.GenerateRangeRingsFromTable_defense("RLOS_Observers",
                                          "rrInputTable",
                                          "OutputRR",
                                          "M4",
                                          "MIN_MAX")

GenerateRangeRingsFromTable example 2 (stand-alone script)

The following example uses the GenerateRangeRingsFromTable function in an example workflow script.

# Description: Generate range rings around active airports

# Import system modules
import arcpy

# Set environment settings
arcpy.env.workspace = r"C:\Data.gdb"
arcpy.env.overwriteOutput = True

# Select points from airports from input
airports = "Airports"
active = "Active_Airports"
whereClause = "Active = 'Yes'"
arcpy.Select_analysis(airports, active, whereClause)

# Generate Range Rings around selected airports
outputRings = "Rings"
outputRadials = "Radials"
ringType = "MIN_MAX"
distType = "KILOMETERS"
arcpy.GenerateRangeRingsFromTable_defense(active,
                                          "rrInputTable",
                                          outputRings,
                                          "M4",
                                          ringType,
                                          outputRadials,
                                          3,
                                          distType,
                                          "Name",
                                          "Min",
                                          "Max")

Environments

Output Coordinate System, Current Workspace, Scratch Workspace

Licensing information

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