Add Geometry Attributes

Summary

Adds new attribute fields to the input features representing the spatial or geometric characteristics and location of each feature, such as length or area and x-, y-, z-, and m-coordinates.

Usage

Caution:

This tool modifies the input data. See Tools that do not create output datasets for more information and strategies to avoid undesired data changes.

• One or many attribute fields will be added to the input features depending on the options specified in the Geometry Properties parameter. If the fields already exist in the input features, the values in those fields will be overwritten. Use the following table to determine which fields will be added for each geometry property:

  Geometry property	Added field
  AREA	POLY_AREA—The area of the polygon.
  AREA_GEODESIC	AREA_GEO—The shape-preserving geodesic area of the polygon.
  CENTROID	CENTROID_X—The x-coordinate of the centroid point. CENTROID_Y—The y-coordinate of the centroid point. CENTROID_Z—The z-coordinate of the centroid point. This field is only added if the input features are z-enabled. CENTROID_M—The m-coordinate of the centroid point. This field is only added if the input features are m-enabled.
  CENTROID_INSIDE	INSIDE_X—The x-coordinate of a central point inside or on the input feature. INSIDE_Y—The y-coordinate of a central point inside or on the input feature. INSIDE_Z—The z-coordinate of a central point inside or on the input feature. This field is only added if the input features are z-enabled. INSIDE_M—The m-coordinate of a central point inside or on the input feature. This field is only added if the input features are m-enabled.
  EXTENT	EXT_MIN_X—The minimum x-coordinate of the feature. EXT_MIN_Y—The minimum y-coordinate of the feature. EXT_MAX_X—The maximum x-coordinate of the feature. EXT_MAX_Y—The maximum y-coordinate of the feature.
  LENGTH	LENGTH—The length of the line.
  LENGTH_GEODESIC	LENGTH_GEO—The shape-preserving geodesic length of the line.
  LENGTH_3D	LENGTH_3D—The 3D length of the line.
  LINE_BEARING	BEARING—The start-to-end bearing of the line. Values range from 0 to 360, with 0 meaning north, 90 east, 180 south, and 270 west.
  LINE_START_MID_END	START_X—The x-coordinate of the first point of the line or polygon border. START_Y—The y-coordinate of the first point of the line or polygon border. START_Z—The z-coordinate of the first point of the line or polygon border. This field is only added if the input features are z-enabled. START_M—The m-coordinate of the first point of the line or polygon border. This field is only added if the input features are m-enabled. MID_X—The x-coordinate of the point halfway along the length of the line or polygon border. MID_Y—The y-coordinate of the point halfway along the length of the line or polygon border. MID_Z—The z-coordinate of the point halfway along the length of the line or polygon border. This field is only added if the input features are z-enabled. MID_M—The m-coordinate of the point halfway along the length of the line or polygon border. This field is only added if the input features are m-enabled. END_X—The x-coordinate of the last point of the line or polygon border. END_Y—The y-coordinate of the last point of the line or polygon border. END_Z—The z-coordinate of the last point of the line or polygon border. This field is only added if the input features are z-enabled. END_M—The m-coordinate of the last point of the line or polygon border. This field is only added if the input features are m-enabled.
  PART_COUNT	PART_COUNT—The number of parts composing the feature.
  PERIMETER_LENGTH	PERIMETER—The length of the polygon perimeter or border.
  PERIMETER_LENGTH_GEODESIC	PERIM_GEO—The shape-preserving geodesic length of the polygon perimeter or border.
  POINT_COUNT	PNT_COUNT—The number of points composing the feature.
  POINT_X_Y_Z_M	POINT_X—The x-coordinate of the point. POINT_Y—The y-coordinate of the point. POINT_Z—The z-coordinate of the point. This field is only added if the input features are z-enabled. POINT_M—The m-coordinate of the point. This field is only added if the input features are m-enabled.

• If a coordinate system is specified, the length and area calculations will be in the units of that coordinate system unless different units are selected in the Length Unit and Area Unit parameters.

• The attribute fields added by this tool are similar to any fields that you can add to a feature layer. You can overwrite the field values, or delete or rename the fields. The values in these fields are not automatically recalculated after edits. If you edit the features, you'll need to run this tool again to update the field values.

• If the input features have a selection, only the selected features will have values calculated in the added fields; all other features will have null values.

• This tool works with point, multipoint, polyline, polygon, and annotation feature classes. Annotation is treated as a polygon feature class.

Syntax

arcpy.management.AddGeometryAttributes(Input_Features, Geometry_Properties, {Length_Unit}, {Area_Unit}, {Coordinate_System})

Parameter	Explanation	Data Type
Input_Features	The input features to which new attribute fields will be added to store properties such as length, area, or x-, y-, z-, and m-coordinates.	Feature Layer
Geometry_Properties [Geometry_Properties,...]	Specifies the geometry or shape properties that will be calculated into new attribute fields. AREA —An attribute will be added to store the area of each polygon feature. AREA_GEODESIC —An attribute will be added to store the shape-preserving geodesic area of each polygon feature. CENTROID —Attributes will be added to store the centroid coordinates of each feature. CENTROID_INSIDE —Attributes will be added to store the coordinates of a central point inside or on each feature. EXTENT —Attributes will be added to store the extent coordinates of each feature. LENGTH —An attribute will be added to store the length of each line feature. LENGTH_GEODESIC —An attribute will be added to store the shape-preserving geodesic length of each line feature. LENGTH_3D —An attribute will be added to store the 3D length of each line feature. LINE_BEARING —An attribute will be added to store the start-to-end bearing of each line feature. Values range from 0 to 360, with 0 meaning north, 90 east, 180 south, and 270 west. LINE_START_MID_END —Attributes will be added to store the coordinates of the start, mid, and end points of each feature. PART_COUNT —An attribute will be added to store the number of parts composing each feature. PERIMETER_LENGTH —An attribute will be added to store the length of the perimeter or border of each polygon feature. PERIMETER_LENGTH_GEODESIC —An attribute will be added to store the shape-preserving geodesic length of the perimeter or border of each polygon feature. POINT_COUNT —An attribute will be added to store the number of points or vertices composing each feature. POINT_X_Y_Z_M —Attributes will be added to store the x-, y-, z-, and m-coordinates of each point feature.	String
Length_Unit (Optional)	Specifies the unit in which the length will be calculated. FEET_US —Length in feet (United States) METERS —Length in meters KILOMETERS —Length in kilometers MILES_US —Length in miles (United States) NAUTICAL_MILES —Length in nautical miles (United States) YARDS —Length in yards (United States)	String
Area_Unit (Optional)	Specifies the unit in which the area will be calculated. ACRES —Area in acres HECTARES —Area in hectares SQUARE_MILES_US —Area in square miles (United States) SQUARE_KILOMETERS —Area in square kilometers SQUARE_METERS —Area in square meters SQUARE_FEET_US —Area in square feet (United States) SQUARE_YARDS —Area in square yards (United States) SQUARE_NAUTICAL_MILES —Area in square nautical miles (United States)	String
Coordinate_System (Optional)	The coordinate system in which the coordinates, length, and area will be calculated. The coordinate system of the input features is used by default.	Coordinate System

Derived Output

Name	Explanation	Data Type
Modified_Input_Features	The updated input features.	Feature Layer

Code sample

AddGeometryAttributes example (Python window)

The following Python window script demonstrates how to use the AddGeometryAttributes tool.

import arcpy
arcpy.env.workspace = r"C:\data\City.gdb"
arcpy.AddGeometryAttributes_management("roads", "LENGTH;LINE_START_MID_END")

AddGeometryAttributes example (stand-alone script)

Get the extent rectangle of each line feature and build a 10 by 10 grid within that extent.

# Name: GridCreation.py

# import system modules
import arcpy

# Set environment settings
arcpy.env.workspace = r"C:\data\City.gdb"
arcpy.env.outputCoordinateSystem = arcpy.Describe("roads").spatialReference

# Set local variables
in_features = "roads"
properties = "EXTENT"
length_unit = ""
area_unit = ""
coordinate_system = ""

# Generate the extent coordinates using Add Geometry Properties tool
arcpy.AddGeometryAttributes_management(in_features, properties, length_unit,
                                       area_unit, coordinate_system)

# Use Search Cursor to walk through each feature and generate grids
with arcpy.da.SearchCursor(in_features, ["OID@", "EXT_MIN_X", "EXT_MIN_Y",
                                         "EXT_MAX_X", "EXT_MAX_Y"]) as sCur:
    for row in sCur:
        minX, minY, maxX, maxY = row[1], row[2], row[3], row[4]
        arcpy.CreateFishnet_management("fishnet_{0}".format(row[0]),
                    number_rows = 10,
                    number_columns = 10,
                    template = "{} {} {} {}".format(minX, maxX, minY, maxY),
                    origin_coord = "{} {}".format(minX, minY),
                    y_axis_coord = "{} {}".format(minX, maxY),
                    corner_coord = "{} {}".format(maxX, maxY),
                    geometry_type = "POLYGON",
                    labels = "NO_LABELS")

Environments

• Output Coordinate System
• Current Workspace

Licensing information

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