Extent

Summary

An extent is a rectangle specified by providing the coordinate of the lower left corner and the coordinate of the upper right corner in map units.

Discussion

The Extent object supports equal (==) and not equal (!=) operators for comparing extents.

Note:

When used as input to ArcGIS Spatial Analyst extension tools—Create Constant Raster, Create Normal Raster, Create Random Raster, Extract By Rectangle, Extract by Mask, and Topo To Raster—only the XMin, YMin, XMax, and YMax values are used by these tools.

Syntax

 Extent  ({XMin}, {YMin}, {XMax}, {YMax}, {ZMin}, {ZMax}, {MMin}, {MMax}, {spatial_reference})

Parameter	Explanation	Data Type
XMin	The extent XMin value.	Double
YMin	The extent YMin value.	Double
XMax	The extent XMax value.	Double
YMax	The extent YMax value.	Double
ZMin	The extent ZMin value. The value is None if there is no z-value.	Double
ZMax	The extent ZMax value. The value is None if there is no z-value.	Double
MMin	The extent MMin value. The value is None if there is no m-value.	Double
MMax	The extent MMax value. The value is None if there is no m-value.	Double
spatial_reference	The spatial reference of the extent.	SpatialReference

Properties

Property	Explanation	Data Type
JSON (Read Only)	A JSON representation of the extent as a string. Tip: The returned string can be converted to a dictionary using the json module's loads function.	String
MMax (Read Only)	The extent MMax value. The value is None if there is no m-value.	Double
MMin (Read Only)	The extent MMin value. The value is None if there is no m-value.	Double
XMax (Read Only)	The extent XMax value.	Double
XMin (Read Only)	The extent XMin value.	Double
YMax (Read Only)	The extent YMax value.	Double
YMin (Read Only)	The extent YMin value.	Double
ZMax (Read Only)	The extent ZMax value. The value is None if there is no z-value.	Double
ZMin (Read Only)	The extent ZMin value. The value is None if there is no z-value.	Double
depth (Read Only)	The extent depth value. The value is None if there is no depth value.	Double
geohash (Read Only)	A geohash string of the extent.	String
geohashCovers (Read Only)	A list of up to the four longest geohash strings that fit within the extent.	String
geohashNeighbors (Read Only)	A list of the geohash neighbor strings for the extent.	String
height (Read Only)	The extent height value.	Double
lowerLeft (Read Only)	The lower left property: A point object is returned.	Point
lowerRight (Read Only)	The lower right property: A point object is returned.	Point
polygon (Read Only)	Returns the extent as a polygon object.	Polygon
spatialReference (Read Only)	The spatial reference of the extent.	SpatialReference
upperLeft (Read Only)	The upper left property: A point object is returned.	Point
upperRight (Read Only)	The upper right property: A point object is returned.	Point
width (Read Only)	The extent width.	Double

Method Overview

Method	Explanation
contains (second_geometry, {relation})	Specifies whether the base geometry contains the comparison geometry. The contains method is the opposite of the within method. Only True relationships are shown in this illustration.
crosses (second_geometry)	Specifies whether the two geometries intersect in a geometry of a lesser shape type. Two polylines cross if they share only points in common, at least one of which is not an endpoint. A polyline and a polygon cross if they share a polyline or a point (for a vertical line) in common on the interior of the polygon that is not equivalent to the entire polyline. Only True relationships are shown in this illustration.
disjoint (second_geometry)	Specifies whether the base and comparison geometries have points in common. Two geometries intersect when this method returns False. Only True relationships are shown in this illustration.
equals (second_geometry)	Specifies whether the base and comparison geometries are of the same shape type and define the same set of points in the plane. This is a 2D comparison only; m- and z-values are ignored. Only True relationships are shown in this illustration.
overlaps (second_geometry)	Specifies whether the intersection of the two geometries has the same shape type as one of the input geometries and is not equivalent to either of the input geometries. Only True relationships are shown in this illustration.
projectAs (spatial_reference, {transformation_name})	Projects a geometry from one spatial reference to another. When the geometry object and the destination spatial reference do not have a common datum, specify a transformation_name parameter value. For more information, see Geographic datum transformations and ListTransformations. A vertical transformation will be performed when the following criteria are met: The geometry object has z-coordinates. The geometry object's spatial reference and the spatial_reference parameter values both have a vertical coordinate system. The transformation_name parameter value is a vertical transformation. When the transformation_name parameter value is a vertical transformation, and neither the geometry object nor the destination spatial reference have a vertical coordinate system, the function will fail with a ValueError exception. If either the geometry object or the spatial_reference parameter value have an unknown spatial reference, the output geometry's spatial reference will be that of the spatial_reference parameter value. Use of unknown spatial reference is not recommended for analysis. The projectAs method will not modify m-values, if present.
touches (second_geometry)	Specifies whether the boundaries of the geometries intersect. Two geometries touch when the intersection of the geometries is not empty, but the intersection of their interiors is empty. For example, a point touches a polyline only if the point is coincident with one of the polyline end points. Only True relationships are shown in this illustration.
within (second_geometry, {relation})	Specifies whether the base geometry is within the comparison geometry. The within method is the opposite operator of the contains method. Only True relationships are shown in this illustration. The base geometry is within the comparison geometry if the base geometry is the intersection of the geometries, and the intersection of their interiors is not empty. The within method is a Clementini operator, except in the case of an empty base geometry.

Methods

contains (second_geometry, {relation})

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object
relation	Specifies the spatial relationship type that will be used. BOUNDARY—The relationship has no restrictions for interiors or boundaries. CLEMENTINI— Interiors of geometries must intersect. This option is equivalent to specifying None. This is the default. PROPER— Boundaries of geometries must not intersect. (The default value is None)	String

Return Value

Data Type	Explanation
Boolean	Returns whether this geometry contains the second geometry.

crosses (second_geometry)

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object

Return Value

Data Type	Explanation
Boolean	Returns whether the two geometries intersect in a geometry of a lesser shape type.

disjoint (second_geometry)

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object

Return Value

Data Type	Explanation
Boolean	Returns whether the two geometries have points in common.

equals (second_geometry)

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object

Return Value

Data Type	Explanation
Boolean	Returns whether the two geometries are of the same shape type and define the same set of points in the plane.

overlaps (second_geometry)

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object

Return Value

Data Type	Explanation
Boolean	Returns whether the intersection of the two geometries has the same dimension as one of the input geometries.

projectAs (spatial_reference, {transformation_name})

Parameter	Explanation	Data Type
spatial_reference	The spatial reference to which the geometry will be projected. The value can be a SpatialReference object or the coordinate system name.	SpatialReference
transformation_name	The geotransformation name. With ArcGIS Pro, if you do not specify a transformation, none will be applied. With ArcGIS Server, if you do not specify a transformation, a fallback transformation will be applied.	String

Return Value

Data Type	Explanation
Object	The projected geometry.

touches (second_geometry)

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object

Return Value

Data Type	Explanation
Boolean	Returns whether the boundaries of the geometries intersect.

within (second_geometry, {relation})

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object
relation	Specifies the spatial relationship type that will be used. BOUNDARY—The relationship has no restrictions for interiors or boundaries. CLEMENTINI— Interiors of geometries must intersect. This option is equivalent to specifying None. This is the default. PROPER— Boundaries of geometries must not intersect. (The default value is None)	String

Return Value

Data Type	Explanation
Boolean	Returns whether the base geometry is within the comparison geometry.

Code sample

Extent example

Display extent object properties for features.

import arcpy

feature_class = 'c:/Data/Florida.gdb/airports'

# Fetch each feature from the cursor and examine the extent properties
for row in arcpy.da.SearchCursor(feature_class, ['SHAPE@', 'CNTY_NAME']):
    extent = row[0].extent
    print('Extent of county {}:'.format(row[1]))
    print('XMin: {}, YMin: {}'.format(extent.XMin, extent.YMin))
    print('XMax: {}, YMax: {}'.format(extent.XMax, extent.YMax))