# Extent (arcpy)

## 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

## Method Overview

 Method Explanation contains (second_geometry) 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) 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.

## Methods

contains (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 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)
 Parameter Explanation Data Type second_geometry A second geometry. Object
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))
``````

3/3/2014