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

Note:

When used as input to ArcGIS Spatial Analyst extension tools, Create Constant Raster, Create Normal Raster, Create Random Raster, Extract By Rectangle 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})

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. None if no Z value.	Double
ZMax	The extent ZMax value. None if no Z value.	Double
MMin	The extent MMin value. None if no M value.	Double
MMax	The extent MMax value. None if no M value.	Double

Properties

Property	Explanation	Data Type
JSON (Read Only)	Returns a JSON representation of the extent as a string. Tip: The returned string can be converted to a dictionary using the Python json.loads function.	String
MMax (Read Only)	The extent MMax value. None if no M value.	Double
MMin (Read Only)	The extent MMin value. None if 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. None if no Z value.	Double
ZMin (Read Only)	The extent ZMin value. None if no Z value.	Double
depth (Read Only)	The extent depth value. None if no depth.	Double
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)	Return 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 value.	Double

Method Overview

Method	Explanation
contains (second_geometry, {relation})	Indicates if the base geometry contains the comparison geometry. contains is the opposite of within. Only True relationships are shown in this illustration.
crosses (second_geometry)	Indicates if 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 an polygon cross if they share a polyline or a point (for vertical line) in common on the interior of the polygon which is not equivalent to the entire polyline. Only True relationships are shown in this illustration.
disjoint (second_geometry)	Indicates if the base and comparison geometries share no points in common. Two geometries intersect if disjoint returns False. Only True relationships are shown in this illustration.
equals (second_geometry)	Indicates if 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)	Indicates if 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 and optionally applies a geotransformation. To project, the geometry needs to have a spatial reference, and not have an UnknownCoordinateSystem. The new spatial reference system passed to the method defines the output coordinate system. If either spatial reference is unknown the coordinates will not be changed. The Z- and measure values are not changed by the ProjectAs method.
touches (second_geometry)	Indicates if 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})	Indicates if the base geometry is within the comparison geometry. within is the opposite operator of contains. 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. within 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	The spatial relationship type. BOUNDARY — Relationship has no restrictions for interiors or boundaries. CLEMENTINI — Interiors of geometries must intersect. Specifying CLEMENTINI 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	A return Boolean value of True indicates 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	A return Boolean value of True indicates 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	A return Boolean value of True indicates that the two geometries share no points in common.

equals (second_geometry)

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object

Return Value

Data Type	Explanation
Boolean	A return Boolean value of True indicates that 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	A return Boolean value of True indicates 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 new spatial reference. This can be a SpatialReference object or the coordinate system name.	SpatialReference
transformation_name	The geotransformation name.	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	A return Boolean value of True indicates the boundaries of the geometries intersect.

within (second_geometry, {relation})

Parameter	Explanation	Data Type
second_geometry	A second geometry.	Object
relation	The spatial relationship type. BOUNDARY — Relationship has no restrictions for interiors or boundaries. CLEMENTINI — Interiors of geometries must intersect. Specifying CLEMENTINI 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	A return Boolean value of True indicates this geometry is contained within the second 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 {0}:".format(row[1]))
    print("XMin: {0}, YMin: {1}".format(extent.XMin, extent.YMin))
    print("XMax: {0}, YMax: {1}".format(extent.XMax, extent.YMax))