Multipoint

Zusammenfassung

A Multipoint object is an ordered collection of points.

Diskussion

Bei vielen Workflows der Geoverarbeitung möchten Sie eventuell bestimmte Vorgänge mit Koordinaten- und Geometriedaten ausführen, jedoch nicht unbedingt eine neue (temporäre) Feature-Class erstellen, diese mit Cursorn füllen, die Feature-Class verwenden und dann die vorläufige Feature-Class wieder löschen. Sie können anstelle von Eingabe und Ausgabe auch Geometrieobjekte verwenden und so die Geoverarbeitung vereinfachen. Geometrieobjekte können von Grund auf neu mit Geometry-, Multipoint-, PointGeometry-, Polygon- oder Polyline-Classes erstellt werden.

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 operators can be used in place of geometry methods:

Python operator	Geometry method
+	intersect
|	union
-	difference
^	symmetricDifference
==	equals
!=	not equals

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.

Syntax

 Multipoint (inputs, {spatial_reference}, {has_z}, {has_m}, {has_id})

Parameter	Erläuterung	Datentyp
inputs	The coordinate information used to create the object. The data type can be Point or Array objects.	Object
spatial_reference	The spatial reference of the new geometry. (Der Standardwert ist None)	SpatialReference
has_z	Specifies whether the geometry will be z-enabled. (Der Standardwert ist False)	Boolean
has_m	Specifies whether the geometry will be m-enabled. (Der Standardwert ist False)	Boolean
has_id	Specifies whether the geometry will support point IDs. (Der Standardwert ist False)	Boolean

Eigenschaften

Eigenschaft	Erläuterung	Datentyp
JSON (Schreibgeschützt)	An Esri JSON representation of the geometry as a string. Tipp: The returned string can be converted to a dictionary using the json module's loads function.	String
WKB (Schreibgeschützt)	The well-known binary (WKB) representation for OGC geometry. This property provides a portable representation of a geometry value as a contiguous stream of bytes.	Bytearray
WKT (Schreibgeschützt)	The well-known text (WKT) representation for OGC geometry. This property 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 (Schreibgeschützt)	The area of a polygon feature. The area is zero for all other feature types.	Double
centroid (Schreibgeschützt)	The true centroid if it is within or on the feature; otherwise, it is the label point.	Point
extent (Lesen und schreiben)	The extent of the geometry.	Extent
firstPoint (Schreibgeschützt)	The first coordinate point of the geometry.	Point
hasCurves (Schreibgeschützt)	Specifies whether the geometry has a curve.	Boolean
hullRectangle (Schreibgeschützt)	A space-delimited string of the coordinate pairs of the convex hull rectangle.	String
isMultipart (Schreibgeschützt)	Specifies whether the number of parts for the geometry is more than one.	Boolean
labelPoint (Schreibgeschützt)	The point at which the label is located. This point is always located within or on a feature.	Point
lastPoint (Schreibgeschützt)	The last coordinate of the feature.	Point
length (Schreibgeschützt)	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 (Schreibgeschützt)	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. Vorsicht: 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. Vorsicht: This property is only available for projected data.	Double
partCount (Schreibgeschützt)	The number of geometry parts for the feature.	Integer
pointCount (Schreibgeschützt)	The total number of points for the feature.	Integer
spatialReference (Schreibgeschützt)	The spatial reference of the geometry.	SpatialReference
trueCentroid (Schreibgeschützt)	The center of gravity for a feature.	Point
type (Schreibgeschützt)	The geometry type: polygon, polyline, point, or multipoint.	String

Methodenübersicht

Methode	Erläuterung
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)	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.
cut (cutter)	Splits this geometry into a part left of the cutting polyline, and a part right of it. When a polyline or polygon is cut, it is split where it intersects the cutter polyline. Each piece is classified as left of or right of the cutter. This classification is based on the orientation of the cutter line. Parts of the target polyline that do not intersect the cutting polyline are returned as part of the right of result for that input polyline. If a geometry is not cut, the left geometry will be empty (None).
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)	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.
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.
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.
move ({dx}, {dy}, {dz})	Moves a geometry by specified distances along the x-, y-, and z-axes to create a new geometry.
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.
projectAs (spatial_reference, {transformation_name})	Projects a geometry from one spatial reference to another. When the geometry object and the destination spatial reference do not have a common datum, specify a transformation_name parameter value. For more information, see Geographic datum transformations and ListTransformations. A vertical transformation will be performed when the following criteria are met: The geometry object has z-coordinates. The geometry object's spatial reference and the spatial_reference parameter values both have a vertical coordinate system. The transformation_name parameter value is a vertical transformation. When the transformation_name parameter value is a vertical transformation, and neither the geometry object nor the destination spatial reference have a vertical coordinate system, the function will fail with a ValueError exception. If either the geometry object or the spatial_reference parameter value have an unknown spatial reference, the output geometry's spatial reference will be that of the spatial_reference parameter value. Use of unknown spatial reference is not recommended for analysis. The projectAs method will not modify m-values, if present.
rotate ({origin}, {rotation_angle})	Rotates a geometry around a specified origin by the degrees given in radians. The rotation is applied relative to the origin, so that the geometry rotates around the origin. The position of the rotated geometry is significantly affected by the choice of origin. Rotate does not apply to the z-direction. The following describes a few possible choices for the origin and its affect on the output: The origin is outside the geometry (not within or touching the geometry)—The location of the geometry will change, but the geometry will maintain relative positions to other geometries rotated in the same way. Positions will rotate around the origin. The origin is at the centroid of the geometry (the centroid is within or touching geometry)—The geometry will rotate (spin) in place around its centroid. The origin is on a vertex of the geometry—The geometry will rotate around the chosen vertex.
scale ({origin}, {sx}, {sy}, {sz})	Scales a geometry from a specified origin by specified factors along the x-, y-, and z-axes to create a new geometry. The position of a transformed point (or vertex) is given by ( (x - origin_x) * scale_x + origin_x, (y - origin_y) * scale_y + origin_y, (z - origin_z) * scale_z + origin_z ) The transformation is applied relative to the origin, so that the origin remains stationary while the geometry expands or contracts around it. The position and the direction of the expansion or contraction for the resulting geometries is significantly affected by the origin. The following describes a few possible choices for the origin and its affect on the output: The origin is outside the geometry (not within or touching the geometry)—The size and location of the geometry will change, but the geometry will maintain relative positions to other geometries scaled in the same way. Positions will expand away from or contract toward the origin point. The origin is at the centroid of the geometry (if the centroid is within or touching geometry)—The size of the geometry will change, but the geometry's location will remain anchored at the centroid. The geometry will grow or shrink in place around the centroid. The origin is on a vertex of the geometry—The size of the geometry will change, but the position of the geometry will remain anchored at the chosen vertex. The geometry will grow from or shrink toward the chosen vertex.
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.
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.

Methoden

boundary ()

Rückgabewert

Datentyp	Erläuterung
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)

Parameter	Erläuterung	Datentyp
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

Rückgabewert

Datentyp	Erläuterung
Polygon	The buffered polygon geometry.

clip (envelope)

Parameter	Erläuterung	Datentyp
envelope	An Extent object used to define the clip extent.	Extent

Rückgabewert

Datentyp	Erläuterung
Object	An output geometry clipped to the specified extent.

contains (second_geometry, {relation})

Parameter	Erläuterung	Datentyp
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

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

convexHull ()

Rückgabewert

Datentyp	Erläuterung
Object	The resulting geometry. The convex hull of a single point is the point itself.

crosses (second_geometry)

Parameter	Erläuterung	Datentyp
second_geometry	A second geometry.	Object

Rückgabewert

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

cut (cutter)

Parameter	Erläuterung	Datentyp
cutter	The cutting polyline geometry.	PolyLine

Rückgabewert

Datentyp	Erläuterung
Geometry	A list of two geometries.

difference (other)

Parameter	Erläuterung	Datentyp
other	A second geometry.	Object

Rückgabewert

Datentyp	Erläuterung
Object	The resulting geometry.

disjoint (second_geometry)

Parameter	Erläuterung	Datentyp
second_geometry	A second geometry.	Object

Rückgabewert

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

distanceTo (other)

Parameter	Erläuterung	Datentyp
other	A second geometry.	Object

Rückgabewert

Datentyp	Erläuterung
Double	The distance between the two geometries.

equals (second_geometry)

Parameter	Erläuterung	Datentyp
second_geometry	A second geometry.	Object

Rückgabewert

Datentyp	Erläuterung
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})

Parameter	Erläuterung	Datentyp
index	The index position of the geometry.	Integer

Rückgabewert

Datentyp	Erläuterung
Array	The resultant Array object.

intersect (other, dimension)

Parameter	Erläuterung	Datentyp
other	The second geometry.	Object
dimension	The topological dimension (shape type) of the resulting geometry. 1—A zero-dimensional geometry (point or multipoint). 2—A one-dimensional geometry (polyline). 4—A two-dimensional geometry (polygon).	Integer

Rückgabewert

Datentyp	Erläuterung
Object	A new geometry (point, multipoint, polyline, or polygon) that is the geometric intersection of the two input geometries.

move ({dx}, {dy}, {dz})

Parameter	Erläuterung	Datentyp
dx	The distance the geometry will be moved along the x-axis. (Der Standardwert ist 0.0)	Double
dy	The distance the geometry will be moved along the y-axis. (Der Standardwert ist 0.0)	Double
dz	The distance the geometry will be moved along the z-axis. The geometry must be z-aware and have z-values. (Der Standardwert ist 0.0)	Double

Rückgabewert

Datentyp	Erläuterung
Geometry	An output geometry, moved by the specified distances along the x-, y-, and z-axes.

overlaps (second_geometry)

Parameter	Erläuterung	Datentyp
second_geometry	A second geometry.	Object

Rückgabewert

Datentyp	Erläuterung
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})

Parameter	Erläuterung	Datentyp
spatial_reference	The spatial reference to which the geometry will be projected. The value can be a SpatialReference object or the coordinate system name.	SpatialReference
transformation_name	The geotransformation name. With ArcGIS Pro, if you do not specify a transformation, none will be applied. With ArcGIS Server, if you do not specify a transformation, a fallback transformation will be applied.	String

Rückgabewert

Datentyp	Erläuterung
Object	The projected geometry.

rotate ({origin}, {rotation_angle})

Parameter	Erläuterung	Datentyp
origin	The origin of the transformation. The argument can be either an arcpy.Point object or an arcpy.PointGeometry object. The default origin, arcpy.Point(0.0, 0.0), will usually be located outside the target geometry. (Der Standardwert ist arcpy.Point(0.0, 0.0))	Point
rotation_angle	The angle, in radians, to rotate the geometry around its origin. The default rotation angle is 0.0 radians (no rotation). (Der Standardwert ist 0.0)	Float

Rückgabewert

Datentyp	Erläuterung
Geometry	An output geometry rotated by the specified angle around the specified origin.

scale ({origin}, {sx}, {sy}, {sz})

Parameter	Erläuterung	Datentyp
origin	The origin of the transformation. The argument can be either an arcpy.Point object or an arcpy.PointGeometry object. The default origin, arcpy.Point(0.0, 0.0, 0.0), will usually be located outside the target geometry. (Der Standardwert ist arcpy.Point(0.0, 0.0, 0.0))	Point
sx	The factor that will be used to scale the geometry along the x-axis. (Der Standardwert ist 1.0)	Double
sy	The factor that will be used to scale the geometry along the y-axis. (Der Standardwert ist 1.0)	Double
sz	The factor that will be used to scale the geometry along the z-axis. The geometry must be z-aware and have z-values. (Der Standardwert ist 1.0)	Double

Rückgabewert

Datentyp	Erläuterung
Geometry	An output geometry scaled from the specified origin and by specified factors along the x-, y-, and z-axes.

symmetricDifference (other)

Parameter	Erläuterung	Datentyp
other	A second geometry.	Object

Rückgabewert

Datentyp	Erläuterung
Object	The resulting geometry.

touches (second_geometry)

Parameter	Erläuterung	Datentyp
second_geometry	A second geometry.	Object

Rückgabewert

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

union (other)

Parameter	Erläuterung	Datentyp
other	A second geometry.	Object

Rückgabewert

Datentyp	Erläuterung
Object	The resulting geometry.

within (second_geometry, {relation})

Parameter	Erläuterung	Datentyp
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

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

Codebeispiel

Multipoint example

Create a multipoint feature class from scratch.

import arcpy

# Create a spatial reference from a wkid
spatial_ref = arcpy.SpatialReference(32145)

# A list of features and coordinate pairs
feature_info = [[[1, 2], [2, 4], [3, 7]],
                [[6, 8], [5, 7], [7, 2], [9, 5]]]

# A list that will hold each of the Multipoint objects
features = []

# Create Multipoint objects from an array of points
for feature in feature_info:
    array = arcpy.Array([arcpy.Point(*coords) for coords in feature])
    multipoint = arcpy.Multipoint(array, spatial_ref)
    features.append(multipoint)

# Persist a copy of the Multipoint objects using CopyFeatures
arcpy.management.CopyFeatures(features, "c:/geometry/multipoints.shp")