Point

サマリー

A representation of an x,y pair, optionally with measure, height, and ID attributes.

ディスカッション

A Point object does not include spatial reference information and is frequently used to construct other geometry objects, including PointGeometry, Polyline, Polygon, and Multipoint objects. In the example below, a Point object is used to create a PointGeometry object.

pt = arcpy.Point(-12683890.6, 5811151.5)
pt_geometry = arcpy.PointGeometry(pt, spatial_reference=arcpy.SpatialReference(3857))

構文

Point({X}, {Y}, {Z}, {M}, {ID})

名前	説明	データ タイプ
X (オプション)	The x-coordinate of the point. The default value is 0.0.	Double
Y (オプション)	The y-coordinate of the point. The default value is 0.0.	Double
Z (オプション)	The z-coordinate of the point. The default value is None.	Double
M (オプション)	The m-value of the point. The default value is None.	Double
ID (オプション)	The shape ID of the point. The default value is 0.	Integer

プロパティ

名前	説明	データ タイプ
ID (読み取り/書き込み)	An integer used to uniquely identify the point.	Integer
M (読み取り/書き込み)	The measure value of the point.	Double
X (読み取り/書き込み)	The horizontal coordinate of the point.	Double
Y (読み取り/書き込み)	The vertical coordinate of the point.	Double
Z (読み取り/書き込み)	The elevation value of the point.	Double

方法

clone(point_object)

Clone the Point object.

名前	説明	データ タイプ
point_object	A Point object.	Point

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.

名前	説明	データ タイプ
second_geometry	A second geometry.	Object
relation (オプション)	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. The default value is None.	String

戻り値

データ タイプ	説明
Boolean	Returns whether this geometry contains the second geometry.

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.

名前	説明	データ タイプ
second_geometry	A second geometry.	Object

戻り値

データ タイプ	説明
Boolean	Returns whether the two geometries intersect in a geometry of a lesser shape type.

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.

名前	説明	データ タイプ
second_geometry	A second geometry.	Object

戻り値

データ タイプ	説明
Boolean	Returns whether the two geometries have points in common.

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.

名前	説明	データ タイプ
second_geometry	A second geometry.	Object

戻り値

データ タイプ	説明
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)

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.

名前	説明	データ タイプ
second_geometry	A second geometry.	Object

戻り値

データ タイプ	説明
Boolean	Returns whether the intersection of the two geometries has the same dimension as one of the input geometries.

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.

名前	説明	データ タイプ
second_geometry	A second geometry.	Object

戻り値

データ タイプ	説明
Boolean	Returns whether the boundaries of the geometries intersect.

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.

名前	説明	データ タイプ
second_geometry	A second geometry.	Object
relation (オプション)	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. The default value is None.	String

戻り値

データ タイプ	説明
Boolean	Returns whether the base geometry is within the comparison geometry.

コードのサンプル

Point example

Create a Point object and print some of its properties.

import arcpy

# Create point object
point = arcpy.Point(2000, 2500)

# Print point properties
print("Point properties:")
print(" X:  {0}".format(point.X))
print(" Y:  {0}".format(point.Y))

Point example 2

Examine Point objects returned from a Polygon object.

import arcpy

# Create cursor to retrieve Hawaii shape
feature_class = "c:/data/Hawaii.shp"
cursor = arcpy.da.SearchCursor(feature_class, ["SHAPE@"])

for row in cursor:
    # Get the geometry object from the shape field
    print("Number of Hawaiian islands: {0}".format(row[0].partCount))

    # GetPart returns an array of point objects for each part.
    for island in row[0].getPart():
        print("Vertices in island: {0}".format(island.count))
        for point in island:
            print("X: {0}, Y: {1})".format(point.X, point.Y))

関連トピック

• PointGeometry
• Polygon
• Polyline
• Multipoint
• Geometry
• Array
• Read geometries
• Write geometries
• Using geometry objects with geoprocessing tools