Extent

Zusammenfassung

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.

Diskussion

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

Hinweis:

When used as input to Erweiterung "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.

Syntax

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

The spatial reference of the extent.

SpatialReference

Eigenschaften

EigenschaftErläuterungDatentyp
JSON
(Schreibgeschützt)

Returns a JSON representation of the extent as a string.

Tipp:

The returned string can be converted to a dictionary using the json module's loads function.

String
MMax
(Schreibgeschützt)

The extent MMax value. None if no m-value.

Double
MMin
(Schreibgeschützt)

The extent MMin value. None if no m-value.

Double
XMax
(Schreibgeschützt)

The extent XMax value.

Double
XMin
(Schreibgeschützt)

The extent XMin value.

Double
YMax
(Schreibgeschützt)

The extent YMax value.

Double
YMin
(Schreibgeschützt)

The extent YMin value.

Double
ZMax
(Schreibgeschützt)

The extent ZMax value. None if no z-value.

Double
ZMin
(Schreibgeschützt)

The extent ZMin value. None if no z-value.

Double
depth
(Schreibgeschützt)

The extent depth value. None if no depth.

Double
geohash
(Schreibgeschützt)

A geohash string of the extent is returned.

String
geohashCovers
(Schreibgeschützt)

Returns a list of up to the four longest geohash strings that fit within the extent.

String
geohashNeighbors
(Schreibgeschützt)

A list of the geohash neighbor strings for the extent is returned.

String
height
(Schreibgeschützt)

The extent height value.

Double
lowerLeft
(Schreibgeschützt)

The lower left property: A point object is returned.

Point
lowerRight
(Schreibgeschützt)

The lower right property: A point object is returned.

Point
polygon
(Schreibgeschützt)

Returns the extent as a polygon object.

Polygon
spatialReference
(Schreibgeschützt)

The spatial reference of the extent.

SpatialReference
upperLeft
(Schreibgeschützt)

The upper left property: A point object is returned.

Point
upperRight
(Schreibgeschützt)

The upper right property: A point object is returned.

Point
width
(Schreibgeschützt)

The extent width value.

Double

Methodenübersicht

MethodeErläuterung
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.

Possible contains relationships
crosses (second_geometry)

Gibt an, ob die beiden Geometrien sich in einer Geometrie mit einem geringeren Shape-Typ überschneiden.

Zwei Polylinien kreuzen sich, wenn sie nur Punkte gemeinsam haben, von denen mindestens einer kein Endpunkt ist. Eine Polylinie und ein Polygon kreuzen sich, wenn sie im Inneren des Polygons eine Polylinie oder einen Punkt (für eine vertikale Linie) gemeinsam haben, die bzw. der nicht der gesamten Polylinie entspricht.

Only True relationships are shown in this illustration.

Mögliche Beziehungen zwischen Überschneidungen
disjoint (second_geometry)

Gibt an, ob die Basis- und die Vergleichsgeometrie keine gemeinsamen Punkte aufweisen.

Zwei Geometrien überschneiden sich, wenn disjoint den Wert False zurückgibt.

Only True relationships are shown in this illustration.

Mögliche Beziehungen zwischen nicht überschneidenden Geometrien
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.

Possible equals relationships
overlaps (second_geometry)

Gibt an, üb die Überschneidung der beiden Geometrien denselben Shape-Typ wie eine der Eingabegeometrien aufweist, aber keiner der Eingabegeometrien entspricht.

Only True relationships are shown in this illustration.

Mögliche Beziehungen bei Überlappungen
projectAs (spatial_reference, {transformation_name})

Projects a geometry and optionally applies a geotransformation.

To project, the geometry must have a spatial reference, and not have an unknown coordinate system. 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 m-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.

Possible touches relationships
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.

Possible within relationships

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.

Methoden

contains (second_geometry, {relation})
ParameterErläuterungDatentyp
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.

(Der Standardwert ist None)

String
Rückgabewert
DatentypErläuterung
Boolean

A return Boolean value of True indicates this geometry contains the second geometry.

crosses (second_geometry)
ParameterErläuterungDatentyp
second_geometry

A second geometry.

Object
Rückgabewert
DatentypErläuterung
Boolean

Der boolesche Rückgabetyp "True" gibt an, dass sich die beiden Geometrien in einer Geometrie mit einem geringeren Shape-Typ schneiden.

disjoint (second_geometry)
ParameterErläuterungDatentyp
second_geometry

A second geometry.

Object
Rückgabewert
DatentypErläuterung
Boolean

Der boolesche Rückgabetyp "True" gibt an, dass die beiden Geometrien keine gemeinsamen Punkte aufweisen.

equals (second_geometry)
ParameterErläuterungDatentyp
second_geometry

A second geometry.

Object
Rückgabewert
DatentypErläuterung
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)
ParameterErläuterungDatentyp
second_geometry

A second geometry.

Object
Rückgabewert
DatentypErläuterung
Boolean

Der boolesche Rückgabetyp True gibt an, dass die Überschneidung der beiden Geometrien dieselbe Dimension wie eine der Eingabegeometrien aufweist.

projectAs (spatial_reference, {transformation_name})
ParameterErläuterungDatentyp
spatial_reference

The new spatial reference. This can be a SpatialReference object or the coordinate system name.

SpatialReference
transformation_name

The geotransformation name.

String
Rückgabewert
DatentypErläuterung
Object

The projected geometry.

touches (second_geometry)
ParameterErläuterungDatentyp
second_geometry

A second geometry.

Object
Rückgabewert
DatentypErläuterung
Boolean

A return Boolean value of True indicates the boundaries of the geometries intersect.

within (second_geometry, {relation})
ParameterErläuterungDatentyp
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.

(Der Standardwert ist None)

String
Rückgabewert
DatentypErläuterung
Boolean

A return Boolean value of True indicates this geometry is contained within the second geometry.

Codebeispiel

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))

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