Generate Grid From Area (Defense)

Summary

Generates a Gridded Reference Graphic (GRG) over a specified area with a custom size based on a bounding polygon.

Usage

• The output grid will completely fill the input area.

• The rotation of Input Feature determines the rotation of the output grid.

• Cell labels will be added to a Grid field in the Output Feature Class.

• The Output Feature Class is in the Web Mercator coordinate system.

Parameters

Dialog

Label	Explanation	Data Type
Input Feature	The input polygon feature on which the GRG will be based.	Feature Set
Output Feature Class	The output polygon feature class containing the GRG.	Feature Class
Cell Width (Optional)	The width of the cells. Measurement units are specified by the Cell Units parameter.	Double
Cell Height (Optional)	The height of the cells. Measurement units are specified by the Cell Units parameter.	Double
Cell Units (Optional)	Specifies the measurement units for cell width and height. 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
Label Start Position (Optional)	Specifies the grid cell where labelling will start. Upper left—The label position will be the upper left. This is the default. Lower left—The label position will be the lower left. Upper right—The label position will be the upper right. Lower right—The label position will be the lower right.	String
Label Format (Optional)	Specifies the labeling type for each grid cell. Alpha-numeric—The label will use an alpha character, a separator, and a number. This is the default. Alpha-alpha—The label will use an alpha character, a separator, and an additional alpha character. Numeric—The label will be numeric.	String
Label Separator (Optional)	Specifies the separator to be used between x- and y-values when the Label Format parameter is set to Alpha-alpha, for example, A-A, A-AA, AA-A. Hyphen—The label separator will be a hyphen. This is the default. Comma—The label separator will be a comma. Period—The label separator will be a period. Forward slash—The label separator will be a forward slash.	String

Python

arcpy.defense.GenerateGRGFromArea(in_feature, out_feature_class, {cell_width}, {cell_height}, {cell_units}, {label_start_position}, {label_format}, {label_separator})

Name	Explanation	Data Type
in_feature	The input polygon feature on which the GRG will be based.	Feature Set
out_feature_class	The output polygon feature class containing the GRG.	Feature Class
cell_width (Optional)	The width of the cells. Measurement units are specified by the Cell Units parameter.	Double
cell_height (Optional)	The height of the cells. Measurement units are specified by the Cell Units parameter.	Double
cell_units (Optional)	Specifies the measurement units for cell width and height. 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
label_start_position (Optional)	Specifies the grid cell where labelling will start. UPPER_LEFT—The label position will be the upper left. This is the default. LOWER_LEFT—The label position will be the lower left. UPPER_RIGHT—The label position will be the upper right. LOWER_RIGHT—The label position will be the lower right.	String
label_format (Optional)	Specifies the labeling type for each grid cell. ALPHA_NUMERIC—The label will use an alpha character, a separator, and a number. This is the default. ALPHA_ALPHA—The label will use an alpha character, a separator, and an additional alpha character. NUMERIC—The label will be numeric.	String
label_separator (Optional)	Specifies the separator to be used between x- and y-values when the label_format parameter is set to ALPHA_ALPHA, for example, A-A, A-AA, AA-A. -—The label separator will be a hyphen. This is the default. ,—The label separator will be a comma. .—The label separator will be a period. /—The label separator will be a forward slash.	String

Code sample

GenerateGRGFromArea example 1 (Python window)

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

import arcpy
arcpy.env.workspace = r"C:/Data.gdb"
arcpy.GenerateGRGFromArea_defense(r"Area_layer",
                                  r"GenerateGRGFromArea",
                                  1000, 1000,
                                  "METERS",
                                  "UPPER_LEFT",
                                  "ALPHA_NUMERIC",
                                  "-")

GenerateGRGFromArea example 2 (stand-alone script)

The following example uses the GenereateGRGFromArea function in a sample workflow.

# Import system modules
import arcpy

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

# Select airport area
airports = "Airports"
whereClause = "airport_code = 'CLT'"
clt_layer = arcpy.SelectLayerByAttribute_management(airports,
                                                    "NEW_SELECTION",
                                                    whereClause)

# Create GRG
arcpy.GenerateGRGFromArea_defense(clt_layer,
                                  r"GenerateGRGFromArea",
                                  1000, 1000,
                                  "METERS",
                                  "UPPER_LEFT",
                                  "ALPHA_NUMERIC",
                                  "-")

Environments

Output Coordinate System, Current Workspace, Scratch Workspace