サマリー
A PointGeometry object is a shape that has neither length nor area at a given scale.
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。
During the creation of a geometry object, a simplification process is performed to make the geometry topologically consistent according to its geometry type. For instance, it rectifies polygons that may be self-intersecting, or contain incorrect ring orientations. Coordinates may move within the resolution of the geometry's spatial reference.
The following numeric operators can be used in place of geometry methods:
| Geometry method | Numeric operator |
|---|---|
intersect | + |
union | | |
difference | - |
symmetricDifference | ^ |
For example, to union two geometry objects, g3 = g1 | g2 is equivalent to g3 = g1.union(g2).
The + operator will use the geometry type (dimension) of the first geometry to determine the geometry type of the output.
構文
PointGeometry (inputs, {spatial_reference}, {has_z}, {has_m})| パラメーター | 説明 | データ タイプ |
inputs | The Point used to create the object. | Point |
spatial_reference | The spatial reference of the new geometry. (デフォルト値は次のとおりです None) | SpatialReference |
has_z | The Z state: True for geometry if Z is enabled and False if it is not. (デフォルト値は次のとおりです False) | Boolean |
has_m | The M state: True for geometry if M is enabled and False if it is not. (デフォルト値は次のとおりです False) | Boolean |
プロパティ
| プロパティ | 説明 | データ タイプ |
| JSON (読み取り専用) | Returns an Esri JSON representation of the geometry as a string. ヒント:The returned string can be converted to a dictionary using the json module's loads function. | String |
| WKB (読み取り専用) | Returns the well-known binary (WKB) representation for OGC geometry. It provides a portable representation of a geometry value as a contiguous stream of bytes. | Bytearray |
| WKT (読み取り専用) | Returns the well-known text (WKT) representation for OGC geometry. It provides a portable representation of a geometry value as a text string. Any true curves in the geometry will be densified into approximate curves in the WKT string. | String |
| area (読み取り専用) | The area of a polygon feature. It is zero 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. | Point |
| extent (読み書き) | The extent of the geometry. | Extent |
| firstPoint (読み取り専用) | The first coordinate point of the geometry. | Point |
| hasCurves (読み取り専用) | Returns True if the geometry has a curve. | Boolean |
| 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) | Returns 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. The calculation uses 2D Cartesian mathematics. For point and multipoint geometry, the length will be zero. For polygon geometry, the length will be the 2D length of the boundary. | Double |
| length3D (読み取り専用) | The 3D length of the linear feature. The calculation uses 3D Cartesian mathematics. For point and multipoint geometry, the length will be zero. For polygon geometry, the length will be the 3D length of the boundary. 注意:The operation does not perform unit conversion between the horizontal and the vertical coordinate systems. The x, y, and z coordinates are assumed to be in the same linear unit. 注意:This property is only available for projected data. | 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 |
| spatialReference (読み取り専用) | The spatial reference of the geometry. | SpatialReference |
| 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, or annotation. | String |
方法の概要
| 方法 | 説明 |
| angleAndDistanceTo (other, {method}) | Returns a tuple of angle and distance to a point or polygon. |
| boundary () | Constructs the boundary of the geometry.  |
| buffer (distance) | Constructs a polygon at a specified distance from the geometry.  |
| clip (envelope) | Constructs the intersection of the geometry and the specified extent.  |
| 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.  |
| convexHull () | Constructs the geometry that is the minimal bounding polygon such that all outer angles are convex.  |
| 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.  |
| difference (other) | Constructs the geometry that is composed only of the region unique to the base geometry but not part of the other geometry. The following illustration shows the results when the red polygon is the source geometry.  |
| 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.  |
| distanceTo (other) | Returns the minimum distance between two geometries. The distance is in the units of the geometry's spatial reference. If the geometries intersect, the minimum distance is 0. Both geometries must have the same projection. |
| 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.  |
| getGeohash (precision) | Converts a PointGeometry in geographic coordinate system coordinates of latitude and longitude to a geohash string that is accurate to an arbitrary precision within a bounding box in the geohash grid. |
| getPart ({index}) | Returns an Array object of Point objects for a particular part of the geometry if an index is specified. If an index is not specified, an Array object containing an Array of Point objects for each geometry part is returned. The getPart method is equivalent to indexing an object; that is, obj.getPart(0) is equivalent to obj[0]. |
| intersect (other, dimension) | Constructs a geometry that is the geometric intersection of the two input geometries. Different dimension values can be used to create different shape types. The intersection of two geometries of the same shape type is a geometry containing only the regions of overlap between the original geometries.  For faster results, test if the two geometries are disjoint before calling intersect. |
| 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.  |
| pointFromAngleAndDistance (angle, distance, {method}) | Returns a point at a given angle in degrees and distance in the units of the geometry's spatial reference using the specified measurement type. |
| 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. |
| symmetricDifference (other) | Constructs the geometry that is the union of two geometries minus the instersection of those geometries. The two input geometries must be the same shape type. |
| toCoordString (notation) | Converts a PointGeometry to the selected coordinate system notation. |
| 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.  |
| union (other) | Constructs the geometry that is the set-theoretic union of the input geometries. The two geometries being unioned must be the same shape type. |
| 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.  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. |
方法
angleAndDistanceTo (other, {method})| パラメーター | 説明 | データ タイプ |
other | The second geometry. If the geometry is a polygon, the distance is measured to the centroid of the polygon. | PointGeometry |
method | The method used to measure distance.
(デフォルト値は次のとおりです GEODESIC) | String |
| データ タイプ | 説明 |
| tuple | Returns a tuple of angle (in degrees) and distance (in meters) to another point. |
boundary ()
| データ タイプ | 説明 |
| Object | A polygon's boundary is a polyline. A polyline's boundary is a multipoint, corresponding to the endpoints of the line. A point or multipoint's boundary is an empty point or multipoint. |
buffer (distance)
| パラメーター | 説明 | データ タイプ |
distance | The buffer distance. The buffer distance is in the same units as the geometry that is being buffered. A negative distance can only be specified against a polygon geometry. | Double |
| データ タイプ | 説明 |
| Polygon | The buffered polygon geometry. |
clip (envelope)
| パラメーター | 説明 | データ タイプ |
envelope | An Extent object used to define the clip extent. | Extent |
| データ タイプ | 説明 |
| Object | An output geometry clipped to the specified extent. |
contains (second_geometry, {relation})| パラメーター | 説明 | データ タイプ |
second_geometry | A second geometry. | Object |
relation | The spatial relationship type.
(デフォルト値は次のとおりです None) | String |
| データ タイプ | 説明 |
| Boolean |
A return Boolean value of True indicates this geometry contains the second geometry. |
convexHull ()
| データ タイプ | 説明 |
| Object | The resulting geometry. The convex hull of a single point is the point itself. |
crosses (second_geometry)
| パラメーター | 説明 | データ タイプ |
second_geometry | A second geometry. | Object |
| 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. |
difference (other)
| パラメーター | 説明 | データ タイプ |
other | A second geometry. | Object |
| データ タイプ | 説明 |
| Object | The resulting geometry. |
disjoint (second_geometry)
| パラメーター | 説明 | データ タイプ |
second_geometry | A second geometry. | Object |
| 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. |
distanceTo (other)
| パラメーター | 説明 | データ タイプ |
other | A second geometry. | Object |
| データ タイプ | 説明 |
| Double | The distance between the two geometries. |
equals (second_geometry)
| パラメーター | 説明 | データ タイプ |
second_geometry | A second geometry. | Object |
| 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. |
getGeohash (precision)
| パラメーター | 説明 | データ タイプ |
precision | The precision length of the hash string to return for the PointGeometry. The minimum length is 1 and the maximum length is 20. The default length is 8. (デフォルト値は次のとおりです 8) | Integer |
| データ タイプ | 説明 |
| String | getGeohash returns a geohash string based on the input point geometry latitude and longitude coordinates and the length of precision. |
The spatial reference of the point geometry must be in a geographic coordinate system to return an accurate geohash.
import arcpy
# Spatial reference set to GCS_WGS_1984
spatial_reference = arcpy.SpatialReference(4326)
pnt = arcpy.Point(-88.236, 40.096)
pnt_geometry = arcpy.PointGeometry(pnt, spatial_reference)
print(pnt_geometry.getGeohash(6)) # dp1k05getPart ({index})| パラメーター | 説明 | データ タイプ |
index | The index position of the geometry. | Integer |
| データ タイプ | 説明 |
| Array | The resultant Array object. |
intersect (other, dimension)
| パラメーター | 説明 | データ タイプ |
other | The second geometry. | Object |
dimension | The topological dimension (shape type) of the resulting geometry.
| Integer |
| データ タイプ | 説明 |
| Object | A new geometry (point, multipoint, polyline, or polygon) that is the geometric intersection of the two input geometries. |
overlaps (second_geometry)
| パラメーター | 説明 | データ タイプ |
second_geometry | A second geometry. | Object |
| 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. |
pointFromAngleAndDistance (angle, distance, {method})| パラメーター | 説明 | データ タイプ |
angle | The angle in degrees to the returned point. | Double |
distance | The distance in the units of the geometry's spatial reference to the returned point. | Double |
method | PLANAR measurements reflect the projection of geographic data onto the 2D surface (in other words, they will not take into account the curvature of the earth). GEODESIC, GREAT_ELLIPTIC, LOXODROME, or PRESERVE_SHAPE measurement types can be chosen as an alternative if desired.
(デフォルト値は次のとおりです GEODESIC) | String |
| データ タイプ | 説明 |
| PointGeometry | Returns a point at a given angle and distance in degrees and meters. |
projectAs (spatial_reference, {transformation_name})| パラメーター | 説明 | データ タイプ |
spatial_reference | The new spatial reference. This can be a SpatialReference object or the coordinate system name. | SpatialReference |
transformation_name | The geotransformation name. | String |
| データ タイプ | 説明 |
| Object | The projected geometry. |
symmetricDifference (other)
| パラメーター | 説明 | データ タイプ |
other | A second geometry. | Object |
| データ タイプ | 説明 |
| Object | The resulting geometry. |
toCoordString (notation)
| パラメーター | 説明 | データ タイプ |
notation | The coordinate system notation to be generated.
| None |
| データ タイプ | 説明 |
| String | The point in the chosen coordinate system notation. |
touches (second_geometry)
| パラメーター | 説明 | データ タイプ |
second_geometry | A second geometry. | Object |
| データ タイプ | 説明 |
| Boolean | A return Boolean value of True indicates the boundaries of the geometries intersect. |
union (other)
| パラメーター | 説明 | データ タイプ |
other | A second geometry. | Object |
| データ タイプ | 説明 |
| Object | The resulting geometry. |
within (second_geometry, {relation})| パラメーター | 説明 | データ タイプ |
second_geometry | A second geometry. | Object |
relation | The spatial relationship type.
(デフォルト値は次のとおりです None) | String |
| 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
Create a point feature class from scratch.
import arcpy
# A list of coordinate pairs
pointList = [[1, 2], [3, 5], [7, 3]]
# Create an empty Point object
point = arcpy.Point()
# A list to hold the PointGeometry objects
pointGeometryList = []
# For each coordinate pair, populate the Point object and create a new
# PointGeometry object
for pt in pointList:
point.X = pt[0]
point.Y = pt[1]
pointGeometry = arcpy.PointGeometry(point)
pointGeometryList.append(pointGeometry)
# Create a copy of the PointGeometry objects, by using pointGeometryList as
# input to the CopyFeatures tool.
arcpy.CopyFeatures_management(pointGeometryList, "c:/geometry/a.gdb/points")