Extent (arcpy)

摘要

范围是在地图单位下提供左下角和右上角坐标指定的一个矩形。

讨论

注:

当为 ArcGIS Spatial Analyst 扩展模块 工具（创建常量栅格、创建正态栅格、创建随机栅格、矩形提取和地形转栅格）提供输入时，这些工具仅使用 X 最小值、Y 最小值、X 最大值和 Y 最大值。

语法

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

参数	说明	数据类型
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

属性

属性	说明	数据类型
MMax (只读)	The extent MMax value. None if no M value.	Double
MMin (只读)	The extent MMin value. None if no M value.	Double
XMax (只读)	The extent XMax value.	Double
XMin (只读)	The extent XMin value.	Double
YMax (只读)	The extent YMax value.	Double
YMin (只读)	The extent YMin value.	Double
ZMax (只读)	The extent ZMax value. None if no Z value.	Double
ZMin (只读)	The extent ZMin value. None if no Z value.	Double
depth (只读)	The extent depth value. None if no depth.	Double
height (只读)	The extent height value.	Double
lowerLeft (只读)	The lower left property: A point object is returned.	Point
lowerRight (只读)	The lower right property: A point object is returned.	Point
spatialReference (只读)	The spatial reference of the extent.	SpatialReference
upperLeft (只读)	The upper left property: A point object is returned.	Point
upperRight (只读)	The upper right property: A point object is returned	Point
width (只读)	The extent width value.	Double

方法概述

方法	说明
contains (second_geometry)	Indicates if the base geometry contains the comparison geometry. contains is the opposite of within. 本图仅显示 True 关系。
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. 本图仅显示 True 关系。
disjoint (second_geometry)	Indicates if the base and comparison geometries share no points in common. Two geometries intersect if disjoint returns False. 本图仅显示 True 关系。
equals (second_geometry)	指示原几何和参照几何的 shape 类型是否相同并在平面中定义相同点集。这仅是 2D 的比较；已忽略 M 值和 Z 值。 本图仅显示 True 关系。
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. 本图仅显示 True 关系。
projectAs (spatial_reference, {transformation_name})	定义几何投影，并应用相应的地理变换。 要进行投影，几何体需要具有一个空间参考且不具有 UnknownCoordinateSystem。传递到该方法的新空间参考系统参数定义了一个输出坐标系。如果任一空间参考未知，坐标将不会发生更改。ProjectAs 方法并不更改 Z 值和测量值。
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. 本图仅显示 True 关系。
within (second_geometry)	Indicates if the base geometry is within the comparison geometry. within is the opposite operator of contains. 本图仅显示 True 关系。

方法

contains (second_geometry)

参数	说明	数据类型
second_geometry	A second geometry.	Object

返回值

数据类型	说明
Boolean	A return Boolean value of True indicates this geometry contains the second geometry.

crosses (second_geometry)

参数	说明	数据类型
second_geometry	A second geometry.	Object

返回值

数据类型	说明
Boolean	A return Boolean value of True indicates the two geometries intersect in a geometry of a lesser shape type.

disjoint (second_geometry)

参数	说明	数据类型
second_geometry	A second geometry.	Object

返回值

数据类型	说明
Boolean	A return Boolean value of True indicates that the two geometries share no points in common.

equals (second_geometry)

参数	说明	数据类型
second_geometry	A second geometry.	Object

返回值

数据类型	说明
Boolean	返回布尔值为 True 表示两个几何的 shape 类型相同并在平面中定义了相同点集。

overlaps (second_geometry)

参数	说明	数据类型
second_geometry	A second geometry.	Object

返回值

数据类型	说明
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})

参数	说明	数据类型
spatial_reference	The new spatial reference. This can be a SpatialReference object or the coordinate system name.	SpatialReference
transformation_name	The geotransformation name.	String

返回值

数据类型	说明
Object	经投影的几何。

touches (second_geometry)

参数	说明	数据类型
second_geometry	A second geometry.	Object

返回值

数据类型	说明
Boolean	A return Boolean value of True indicates the boundaries of the geometries intersect.

within (second_geometry)

参数	说明	数据类型
second_geometry	A second geometry.	Object

返回值

数据类型	说明
Boolean	A return Boolean value of True indicates this geometry is contained within the second geometry.

代码实例

范围示例

显示要素的范围对象属性。

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))