Geometry

サマリ

Geometry objects define a spatial location and an associated geometric shape.

説明

多くのジオプロセシング ワークフローでは、座標とジオメトリの情報を使用して特定の操作を行うことだけが必要で、新しい（一時）フィーチャクラスを作成し、カーソルを使用してフィーチャクラスにデータを設定し、そのフィーチャクラスを使用し、最後に一時フィーチャクラスを削除するというプロセスをすべて行う必要はないことがあります。ジオプロセシングを簡単に実行できるように、入力および出力の両フィーチャクラスの代わりにジオメトリ オブジェクトを使用できます。Geometry、Multipoint、PointGeometry、Polygon、または Polyline の各クラスを使用して、ジオメトリ オブジェクトを最初から作成できます。

構文

Geometry (geometry, inputs, {spatialReference}, {hasZ}, {hasM})

パラメータ	説明	データ タイプ
geometry	The geometry type: point, polygon, polyline, or multipoint.	String
inputs	The coordinates used to create the object. The datatype can be either Point or Array objects.	Object
spatialReference	The spatial reference of the new geometry. (デフォルト値は None)	SpatialReference
hasZ	The Z state: True for geometry if Z is enabled and False if it is not. (デフォルト値は False)	Boolean
hasM	The M state: True for geometry if M is enabled and False if it is not. (デフォルト値は False)	Boolean

プロパティ

プロパティ	説明	データ タイプ
area （読み取り専用）	The area of a polygon feature. Empty for all other feature types.	Double
centroid （読み取り専用）	The true centroid if it is within or on the feature; otherwise, the label point is returned. Returns a point object.	Point
extent （読み取り専用）	The extent of the geometry.	Extent
firstPoint （読み取り専用）	The first coordinate point of the geometry.	Point
hullRectangle （読み取り専用）	A space-delimited string of the coordinate pairs of the convex hull rectangle.	String
isMultipart （読み取り専用）	True, if the number of parts for this geometry is more than one.	Boolean
labelPoint （読み取り専用）	The point at which the label is located. The labelPoint is always located within or on a feature.	Point
lastPoint （読み取り専用）	The last coordinate of the feature.	Point
length （読み取り専用）	The length of the linear feature. Zero for point, multipoint feature types.	Double
partCount （読み取り専用）	The number of geometry parts for the feature.	Integer
pointCount （読み取り専用）	The total number of points for the feature.	Integer
trueCentroid （読み取り専用）	The center of gravity for a feature.	Point
type （読み取り専用）	The geometry type: polygon, polyline, point, multipoint, multipatch, dimension, annotation.	String

メソッドの概要

メソッド	説明
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.
getPart ({index})	Returns an array of point objects for a particular part of geometry or an array containing a number of arrays, one for each part.
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.
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.

メソッド

contains (second_geometry)

パラメータ	説明	データ タイプ
second_geometry	A second geometry.	Object

リターン

データ タイプ	説明
Boolean	A return Boolean value of True indicates this geometry contains the second geometry.

crosses (second_geometry)

パラメータ	説明	データ タイプ
second_geometry	A second geometry.	Object

リターン

データ タイプ	説明
Boolean	A return Boolean value of True indicates the two geometries intersect in a geometry of a lesser shape type.

disjoint (second_geometry)

パラメータ	説明	データ タイプ
second_geometry	A second geometry.	Object

リターン

データ タイプ	説明
Boolean	A return Boolean value of True indicates that the two geometries share no points in common.

equals (second_geometry)

パラメータ	説明	データ タイプ
second_geometry	A second geometry.	Object

リターン

データ タイプ	説明
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.

getPart ({index})

パラメータ	説明	データ タイプ
index	The index position of the geometry.	Integer

リターン

データ タイプ	説明
Array	getPart returns an array of point objects for a particular part of the geometry if an index is specified. If an index is not specified, an array containing an array of point objects for each geometry part is returned.

overlaps (second_geometry)

パラメータ	説明	データ タイプ
second_geometry	A second geometry.	Object

リターン

データ タイプ	説明
Boolean	A return Boolean value of True indicates the intersection of the two geometries has the same dimension as one of the input geometries.

touches (second_geometry)

パラメータ	説明	データ タイプ
second_geometry	A second geometry.	Object

リターン

データ タイプ	説明
Boolean	A return Boolean value of True indicates the boundaries of the geometries intersect.

within (second_geometry)

パラメータ	説明	データ タイプ
second_geometry	A second geometry.	Object

リターン

データ タイプ	説明
Boolean	A return Boolean value of True indicates this geometry is contained within the second geometry.

コードのサンプル

Geometry example

When you set the output parameter of a geoprocessing tool to a empty Geometry object, the tool will return a list of Geometry objects.

import arcpy

# Create an empty Geometry object
#
g = arcpy.Geometry()

# Run the CopyFeatures tool, setting the output to the geometry object.  GeometryList
#  is returned as a list of geometry objects.
#  
geometryList = arcpy.CopyFeatures_management("c:/data/streets.shp", g)

# Walk through each geometry, totalling the length
#
length = 0
for geometry in geometryList:
    length += geometry.length

print "Total length: %f" % length