Extent

Synthèse

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.

Remarque :

When used as input to Extension ArcGIS Spatial Analyst 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.

Syntaxe

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

Paramètre	Explication	Type de données
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

Propriétés

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

Vue d’ensemble des méthodes

Méthode	Explication
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.

Méthodes

contains (second_geometry, {relation})

Paramètre	Explication	Type de données
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. (La valeur par défaut est None)	String

Valeur renvoyée

Type de données	Explication
Boolean	Returns whether this geometry contains the second geometry.

crosses (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	Returns whether the two geometries intersect in a geometry of a lesser shape type.

disjoint (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	Returns whether the two geometries have points in common.

equals (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
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)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	Returns whether the intersection of the two geometries has the same dimension as one of the input geometries.

projectAs (spatial_reference, {transformation_name})

Paramètre	Explication	Type de données
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

Valeur renvoyée

Type de données	Explication
Object	The projected geometry.

touches (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	Returns whether the boundaries of the geometries intersect.

within (second_geometry, {relation})

Paramètre	Explication	Type de données
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. (La valeur par défaut est None)	String

Valeur renvoyée

Type de données	Explication
Boolean	Returns whether the base geometry is within the comparison geometry.

Exemple de code

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))