PointGeometry

Synthèse

A PointGeometry object is a shape that has neither length nor area at a given scale.

Discussion

Dans de nombreux workflows de géotraitement, vous devez éventuellement exécuter une opération spécifique à l'aide d'informations sur les coordonnées et la géométrie, sans vouloir nécessairement créer une nouvelle classe d'entités (temporaire), la remplir avec des curseurs, l'utiliser, puis la supprimer. Les objets géométrie peuvent alors être utilisés en entrée et en sortie afin de simplifier le géotraitement. Les objets géométrie peuvent être entièrement créés à l'aide des classes Geometry, Multipoint, PointGeometry, Polygon ou Polyline.

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.

Syntaxe

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

Paramètre	Explication	Type de données
inputs	A Point object used to create the object.	Point
spatial_reference	The spatial reference of the new geometry. (La valeur par défaut est None)	SpatialReference
has_z	Specifies whether the geometry will be z-enabled. (La valeur par défaut est False)	Boolean
has_m	Specifies whether the geometry will be m-enabled. (La valeur par défaut est False)	Boolean
has_id	Specifies whether the geometry will support point IDs. (La valeur par défaut est False)	Boolean

Propriétés

Propriété	Explication	Type de données
JSON (Lecture seule)	An Esri JSON representation of the geometry as a string. Conseil : The returned string can be converted to a dictionary using the json module's loads function.	String
WKB (Lecture seule)	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 (Lecture seule)	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 (Lecture seule)	The area of a polygon feature. The area is zero for all other feature types.	Double
centroid (Lecture seule)	The true centroid if it is within or on the feature; otherwise, it is the label point.	Point
extent (Lecture et écriture)	The extent of the geometry.	Extent
firstPoint (Lecture seule)	The first coordinate point of the geometry.	Point
hasCurves (Lecture seule)	Specifies whether the geometry has a curve.	Boolean
hullRectangle (Lecture seule)	A space-delimited string of the coordinate pairs of the convex hull rectangle.	String
isMultipart (Lecture seule)	Specifies whether the number of parts for the geometry is more than one.	Boolean
labelPoint (Lecture seule)	The point at which the label is located. This point is always located within or on a feature.	Point
lastPoint (Lecture seule)	The last coordinate of the feature.	Point
length (Lecture seule)	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 (Lecture seule)	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. Attention : 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. Attention : This property is only available for projected data.	Double
partCount (Lecture seule)	The number of geometry parts for the feature.	Integer
pointCount (Lecture seule)	The total number of points for the feature.	Integer
spatialReference (Lecture seule)	The spatial reference of the geometry.	SpatialReference
trueCentroid (Lecture seule)	The center of gravity for a feature.	Point
type (Lecture seule)	The geometry type: polygon, polyline, point, or multipoint.	String

Vue d’ensemble des méthodes

Méthode	Explication
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)	Indique si les deux géométries s'intersectent dans une géométrie de type de forme inférieure. Deux polylignes se croisent si elles partagent uniquement des points, dont au moins un n'est pas une extrémité. Une polyligne et un polygone se croisent s'ils partagent une polyligne ou un point (pour une ligne verticale) à l'intérieur du polygone qui n'est pas équivalent à la polyligne entière. 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)	Indique si la géométrie de base et la géométrie de comparaison n'ont aucun point en commun. Deux géométries s'intersectent si la propriété disjoint renvoie 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.
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)	Indique si l'intersection des deux géométries possède le même type de forme que l'une des géométries en entrée et qu'elle n'est pas équivalente à l'une des géométries en entrée. 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 a geometry, the geometry must have a spatial reference and not 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.
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.
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.

Méthodes

angleAndDistanceTo (other, {method})

Paramètre	Explication	Type de données
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. GEODESIC—The shortest line between any two points on the earth's surface on a spheroid (ellipsoid). One use for a geodesic line is to determine the shortest distance between two cities for an airplane's flight path. This is also known as a great circle line if based on a sphere rather than an ellipsoid. GREAT_ELLIPTIC—The line on a spheroid (ellipsoid) defined by the intersection at the surface by a plane that passes through the center of the spheroid and the start and endpoints of a segment. This is also known as a great circle when a sphere is used. LOXODROME—The line follows a single compass bearing, or azimuth. Great circle routes are often broken into a series of loxodromes, which simplifies navigation. This is also known as a rhumb line. PLANAR—Planar measurements use 2D Cartesian mathematics to calculate lengths and areas. This option is only available when measuring in a projected coordinate system and the 2D plane of that coordinate system will be used as the basis for the measurements. Planar measurements reflect the projection of geographic data onto a 2D surface, and do not account for the curvature of the earth. PRESERVE_SHAPE—This type calculates the area or length of the geometry on the surface of the earth ellipsoid, for geometry defined in a projected or geographic coordinate system. This option preserves the shape of the geometry in its coordinate system. (La valeur par défaut est GEODESIC)	String

Valeur renvoyée

Type de données	Explication
tuple	Returns a tuple of angle (in degrees) and distance (in meters) to another point.

boundary ()

Valeur renvoyée

Type de données	Explication
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)

Paramètre	Explication	Type de données
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

Valeur renvoyée

Type de données	Explication
Polygon	The buffered polygon geometry.

clip (envelope)

Paramètre	Explication	Type de données
envelope	An Extent object used to define the clip extent.	Extent

Valeur renvoyée

Type de données	Explication
Object	An output geometry clipped to the specified extent.

contains (second_geometry, {relation})

Paramètre	Explication	Type de données
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. (La valeur par défaut est None)	String

Valeur renvoyée

Type de données	Explication
Boolean	A return Boolean value of True indicates this geometry contains the second geometry.

convexHull ()

Valeur renvoyée

Type de données	Explication
Object	The resulting geometry. The convex hull of a single point is the point itself.

crosses (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	Une valeur booléenne renvoyée True indique que les deux géométries s'intersectent dans une géométrie de type de forme inférieure.

difference (other)

Paramètre	Explication	Type de données
other	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Object	The resulting geometry.

disjoint (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	Une valeur booléenne renvoyée True indique que les deux géométries n'ont aucun point en commun.

distanceTo (other)

Paramètre	Explication	Type de données
other	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Double	The distance between the two geometries.

equals (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
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)

Paramètre	Explication	Type de données
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. (La valeur par défaut est 8)	Integer

Valeur renvoyée

Type de données	Explication
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))  # dp1k05

getPart ({index})

Paramètre	Explication	Type de données
index	The index position of the geometry.	Integer

Valeur renvoyée

Type de données	Explication
Array	The resultant Array object.

intersect (other, dimension)

Paramètre	Explication	Type de données
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

Valeur renvoyée

Type de données	Explication
Object	A new geometry (point, multipoint, polyline, or polygon) that is the geometric intersection of the two input geometries.

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

Paramètre	Explication	Type de données
dx	The distance the geometry will be moved along the x-axis. (La valeur par défaut est 0.0)	Double
dy	The distance the geometry will be moved along the y-axis. (La valeur par défaut est 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. (La valeur par défaut est 0.0)	Double

Valeur renvoyée

Type de données	Explication
Geometry	An output geometry, moved by the specified distances along the x-, y-, and z-axes.

overlaps (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	Une valeur booléenne renvoyée True indique que l'intersection des deux géométries a la même dimension que l'une des géométries en entrée.

pointFromAngleAndDistance (angle, distance, {method})

Paramètre	Explication	Type de données
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. GEODESIC—The shortest line between any two points on the earth's surface on a spheroid (ellipsoid). One use for a geodesic line is when you want to determine the shortest distance between two cities for an airplane's flight path. This is also known as a great circle line if based on a sphere rather than an ellipsoid. GREAT_ELLIPTIC—The line on a spheroid (ellipsoid) defined by the intersection at the surface by a plane that passes through the center of the spheroid and the start and endpoints of a segment. This is also known as a great circle when a sphere is used. LOXODROME—A loxodrome is not the shortest distance between two points but instead defines the line of constant bearing, or azimuth. Great circle routes are often broken into a series of loxodromes, which simplifies navigation. This is also known as a rhumb line. PLANAR—Planar measurements use 2D Cartesian mathematics to calculate lengths and areas. This option is only available when measuring in a projected coordinate system, and the 2D plane of that coordinate system will be used as the basis for the measurements. PRESERVE_SHAPE—This type calculates the area or length of the geometry on the surface of the earth ellipsoid for geometry defined in a projected or geographic coordinate system. This option preserves the shape of the geometry in its coordinate system. (La valeur par défaut est GEODESIC)	String

Valeur renvoyée

Type de données	Explication
PointGeometry	Returns a point at a given angle and distance in degrees and meters.

projectAs (spatial_reference, {transformation_name})

Paramètre	Explication	Type de données
spatial_reference	The spatial reference of the projected geometry. This 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

Valeur renvoyée

Type de données	Explication
Object	The projected geometry.

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

Paramètre	Explication	Type de données
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. (La valeur par défaut est arcpy.Point(0.0, 0.0, 0.0))	Point
sx	The factor that will be used to scale the geometry along the x-axis. (La valeur par défaut est 1.0)	Double
sy	The factor that will be used to scale the geometry along the y-axis. (La valeur par défaut est 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. (La valeur par défaut est 1.0)	Double

Valeur renvoyée

Type de données	Explication
Geometry	An output geometry scaled from the specified origin and by specified factors along the x-, y-, and z-axes.

symmetricDifference (other)

Paramètre	Explication	Type de données
other	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Object	The resulting geometry.

toCoordString (notation)

Paramètre	Explication	Type de données
notation	The coordinate system notation to be generated. DD— Decimal degrees is used, for example, 34.05719570N 117.19647020W. DDM— Degrees decimal minutes is used, for example, 34 03.43174200N 117 11.78821200W. DMS— Degree Minute Seconds, is used, for example, 34 03 25.90452000N 117 11 47.29272000W. GARS— Global Area Reference System is used, for example, 126LJ47. It is based on latitude and longitude, and it divides and subdivides the world into cells. GEOREF— World Geographic Reference System is used, for example, EJCE4821203432. MGRS— Military Grid Reference System is used, for example, 11SMT8186968515. USNG— United States National Grid is used, for example, 11S MT 81869 68515. UTM— Universal Transverse Mercator is used, for example, 11S 481868 3768515. It is based on zone number, MGRS latitude band, and the easting and northing planar coordinate pair in that zone. UTMNS— Universal Transverse Mercator (no spaces) is used, for example, 11N4818683768515. It is based on zone number, hemisphere designator, and the easting and northing planar coordinate pair in that zone.	None

Valeur renvoyée

Type de données	Explication
String	The point in the specified coordinate system notation.

touches (second_geometry)

Paramètre	Explication	Type de données
second_geometry	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Boolean	A return Boolean value of True indicates the boundaries of the geometries intersect.

union (other)

Paramètre	Explication	Type de données
other	A second geometry.	Object

Valeur renvoyée

Type de données	Explication
Object	The resulting geometry.

within (second_geometry, {relation})

Paramètre	Explication	Type de données
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. (La valeur par défaut est None)	String

Valeur renvoyée

Type de données	Explication
Boolean	A return Boolean value of True indicates this geometry is contained within the second geometry.

Exemple de code

PointGeometry example

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")