Zusammenfassung
The point object is used frequently with cursors. Point features return a single point object instead of an array of point objects. All other feature types—polygon, polyline, and multipoint—return an array of point objects or an array containing multiple arrays of point objects if the feature has multiple parts.
Auswertung
A Point is not a geometry class, but is commonly used to construct geometry. In the example below, a Point is used to create a PointGeometry object.point = arcpy.Point(25282, 43770)
ptGeometry = arcpy.PointGeometry(point)
Syntax
Point ({X}, {Y}, {Z}, {M}, {ID})| Parameter | Erklärung | Datentyp |
X | The X coordinate of the point. (Der Standardwert ist 0.0) | Double |
Y | The Y coordinate of the point. (Der Standardwert ist 0.0) | Double |
Z | The Z coordinate of the point. (Der Standardwert ist None) | Double |
M | The M value of the point. (Der Standardwert ist None) | Double |
ID | The shape ID of the point. (Der Standardwert ist 0) | Integer |
Eigenschaften
| Eigenschaft | Erklärung | Datentyp |
| ID (Lesen und schreiben) | An integer used to uniquely identify the point. | Integer |
| M (Lesen und schreiben) | The measure value of the point. | Double |
| X (Lesen und schreiben) | The horizontal coordinate of the point. | Double |
| Y (Lesen und schreiben) | The vertical coordinate of the point. | Double |
| Z (Lesen und schreiben) | The elevation value of the point. | Double |
Methodenübersicht
| Methode | Erklärung |
| clone (point_object) | Clone the point object. |
| 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.  |
| 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.  |
| 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.  |
| 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.  |
| 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.  |
| 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, {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
clone (point_object)
| Parameter | Erklärung | Datentyp |
point_object | A point object. | Point |
contains (second_geometry, {relation})| Parameter | Erklärung | Datentyp |
second_geometry | A second geometry. | Object |
relation | The spatial relationship type.
(Der Standardwert ist None) | String |
| Datentyp | Erklärung |
| Boolean |
A return Boolean value of True indicates this geometry contains the second geometry. |
crosses (second_geometry)
| Parameter | Erklärung | Datentyp |
second_geometry | A second geometry. | Object |
| Datentyp | Erklärung |
| Boolean | Der boolesche Rückgabetyp "True" gibt an, dass sich die beiden Geometrien in einer Geometrie mit einem geringeren Shape-Typ schneiden. |
disjoint (second_geometry)
| Parameter | Erklärung | Datentyp |
second_geometry | A second geometry. | Object |
| Datentyp | Erklärung |
| Boolean | Der boolesche Rückgabetyp "True" gibt an, dass die beiden Geometrien keine gemeinsamen Punkte aufweisen. |
equals (second_geometry)
| Parameter | Erklärung | Datentyp |
second_geometry | A second geometry. | Object |
| Datentyp | Erklärung |
| 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. |
overlaps (second_geometry)
| Parameter | Erklärung | Datentyp |
second_geometry | A second geometry. | Object |
| Datentyp | Erklärung |
| Boolean | Der boolesche Rückgabetyp True gibt an, dass die Überschneidung der beiden Geometrien dieselbe Dimension wie eine der Eingabegeometrien aufweist. |
touches (second_geometry)
| Parameter | Erklärung | Datentyp |
second_geometry | A second geometry. | Object |
| Datentyp | Erklärung |
| Boolean | A return Boolean value of True indicates the boundaries of the geometries intersect. |
within (second_geometry, {relation})| Parameter | Erklärung | Datentyp |
second_geometry | A second geometry. | Object |
relation | The spatial relationship type.
(Der Standardwert ist None) | String |
| Datentyp | Erklärung |
| Boolean | A return Boolean value of True indicates this geometry is contained within the second geometry. |
Codebeispiel
Create Point object and display its properties.
import arcpy
# Create point object
point = arcpy.Point(2000, 2500)
# Print point properties
print("Point properties:")
print(" ID: {0}".format(point.ID))
print(" X: {0}".format(point.X))
print(" Y: {0}".format(point.Y))Examine point objects in polygon array object, returned from geometry 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))