Resumen
Geometry objects define a spatial location and an associated geometric shape.
Debate
En muchos flujos de trabajo de geoprocesamiento, puede que necesite ejecutar una operación concreta utilizando información de coordenadas y geometría, pero que no necesariamente desee pasar por el proceso de crear una nueva clase de entidad (temporal), llenar la clase de entidad con cursores, utilizar la clase de entidad y, a continuación, eliminar la clase de entidad temporal. En su lugar, puede utilizar objetos de geometría tanto para la entrada como para la salida con el fin de facilitar el geoprocesamiento. Los objetos de geometría se pueden crear desde cero usando clases Geometry, Multipoint, PointGeometry, Polygon o 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 selfintersecting, or contain incorrect ring orientations. Coordinates may move within the resolution of the geometry's spatial reference.
Sintaxis
Geometry (geometry, inputs, {spatial_reference}, {has_z}, {has_m})
Parámetro  Explicación  Tipo de datos 
geometry  The geometry type: point, polygon, polyline, or multipoint.  String 
inputs  The coordinates used to create the object. The data type can be either Point or Array objects.  Object 
spatial_reference  The spatial reference of the new geometry. (El valor predeterminado es None)  SpatialReference 
has_z  The Z state: True for geometry if Z is enabled and False if it is not. (El valor predeterminado es False)  Boolean 
has_m  The M state: True for geometry if M is enabled and False if it is not. (El valor predeterminado es False)  Boolean 
Propiedades
Propiedad  Explicación  Tipo de datos 
JSON (Sólo lectura)  Returns an Esri JSON representation of the geometry as a string. Sugerencia:The returned string can be converted to a dictionary using the json module's loads function.  String 
WKB (Sólo lectura)  Returns the wellknown binary (WKB) representation for OGC geometry. It provides a portable representation of a geometry value as a contiguous stream of bytes.  Bytearray 
WKT (Sólo lectura)  Returns the wellknown 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 (Sólo lectura)  The area of a polygon feature. It is zero for all other feature types.  Double 
centroid (Sólo lectura)  The true centroid if it is within or on the feature; otherwise, the label point is returned.  Point 
extent (Lectura y escritura)  The extent of the geometry.  Extent 
firstPoint (Sólo lectura)  The first coordinate point of the geometry.  Point 
hasCurves (Sólo lectura)  Returns True if the geometry has a curve.  Boolean 
hullRectangle (Sólo lectura)  A spacedelimited string of the coordinate pairs of the convex hull rectangle.  String 
isMultipart (Sólo lectura)  Returns True if the number of parts for this geometry is more than one.  Boolean 
labelPoint (Sólo lectura)  The point at which the label is located. The labelPoint is always located within or on a feature.  Point 
lastPoint (Sólo lectura)  The last coordinate of the feature.  Point 
length (Sólo lectura)  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 (Sólo lectura)  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. Precaución: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. Precaución:This property is only available for projected data.  Double 
partCount (Sólo lectura)  The number of geometry parts for the feature.  Integer 
pointCount (Sólo lectura)  The total number of points for the feature.  Integer 
spatialReference (Sólo lectura)  The spatial reference of the geometry.  SpatialReference 
trueCentroid (Sólo lectura)  The center of gravity for a feature.  Point 
type (Sólo lectura)  The geometry type: polygon, polyline, point, multipoint, multipatch, dimension, or annotation.  String 
Descripción general del método
Método  Explicación 
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. 
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). 
densify (type, distance, {deviation})  Creates a new geometry with added vertices. 
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. 
generalize (max_offset)  Creates a new simplified geometry using a specified maximum offset tolerance. 
getArea ({type}, {units})  Returns the area of the feature using a measurement type. 
getLength ({measurement_type}, {units})  Returns the length of the feature using a measurement type. 
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. 
measureOnLine (in_point, {use_percentage})  Returns a measure from the start point of this line to the in_point. 
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. 
positionAlongLine (value, {use_percentage}, {geodesic})  Returns a point on a line at a specified distance from the beginning of the line. 
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 mvalues are not changed by the projectAs method. 
queryPointAndDistance (in_point, {as_percentage})  Finds the point on the polyline nearest to the in_point and the distance between those points. Also returns information about the side of the line the in_point is on as well as the distance along the line where the nearest point occurs. 
segmentAlongLine (start_measure, end_measure, {use_percentage})  Returns a Polyline between start and end measures. Similar to Polyline.positionAlongLine but will return a polyline segment between two points on the polyline instead of a single point. 
snapToLine (in_point)  Returns a new point based on in_point snapped to this geometry. 
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 settheoretic 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. 
Métodos
angleAndDistanceTo (other, {method})
Parámetro  Explicación  Tipo de datos 
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.
(El valor predeterminado es GEODESIC)  String 
Tipo de datos  Explicación 
tuple  Returns a tuple of angle (in degrees) and distance (in meters) to another point. 
boundary ()
Tipo de datos  Explicación 
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)
Parámetro  Explicación  Tipo de datos 
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 
Tipo de datos  Explicación 
Polygon  The buffered polygon geometry. 
clip (envelope)
Parámetro  Explicación  Tipo de datos 
envelope  An Extent object used to define the clip extent.  Extent 
Tipo de datos  Explicación 
Object  An output geometry clipped to the specified extent. 
contains (second_geometry, {relation})
Parámetro  Explicación  Tipo de datos 
second_geometry  A second geometry.  Object 
relation  The spatial relationship type.
(El valor predeterminado es None)  String 
Tipo de datos  Explicación 
Boolean 
A return Boolean value of True indicates this geometry contains the second geometry. 
convexHull ()
Tipo de datos  Explicación 
Object  The resulting geometry. The convex hull of a single point is the point itself. 
crosses (second_geometry)
Parámetro  Explicación  Tipo de datos 
second_geometry  A second geometry.  Object 
Tipo de datos  Explicación 
Boolean  A return Boolean value of True indicates the two geometries intersect in a geometry of a lesser shape type. 
cut (cutter)
Parámetro  Explicación  Tipo de datos 
cutter  The cutting polyline geometry.  PolyLine 
Tipo de datos  Explicación 
Geometry  A list of two geometries. 
densify (type, distance, {deviation})
Parámetro  Explicación  Tipo de datos 
type  The type of densification, DISTANCE, ANGLE, or GEODESIC.
 String 
distance  The maximum distance between vertices. The actual distance between vertices will usually be less than the maximum distance as new vertices will be evenly distributed along the original segment. If using a type of DISTANCE or ANGLE, the distance is measured in the units of the geometry's spatial reference. If using a type of GEODESIC, the distance is measured in meters.  Double 
deviation  Densify uses straight lines to approximate curves. You use deviation to control the accuracy of this approximation. The deviation is the maximum distance between the new segment and the original curve. The smaller its value, the more segments will be required to approximate the curve. If using a type of DISTANCE, the deviation is measured in the units of the geometry's spatial reference. If using a type of ANGLE, the deviation is measured in radians. If using a type of GEODESIC, the deviation is not used.  Double 
Tipo de datos  Explicación 
Geometry  The densified geometry. 
difference (other)
Parámetro  Explicación  Tipo de datos 
other  A second geometry.  Object 
Tipo de datos  Explicación 
Object  The resulting geometry. 
disjoint (second_geometry)
Parámetro  Explicación  Tipo de datos 
second_geometry  A second geometry.  Object 
Tipo de datos  Explicación 
Boolean  A return Boolean value of True indicates that the two geometries share no points in common. 
distanceTo (other)
Parámetro  Explicación  Tipo de datos 
other  A second geometry.  Object 
Tipo de datos  Explicación 
Double  The distance between the two geometries. 
equals (second_geometry)
Parámetro  Explicación  Tipo de datos 
second_geometry  A second geometry.  Object 
Tipo de datos  Explicación 
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. 
generalize (max_offset)
Parámetro  Explicación  Tipo de datos 
max_offset  The maximum offset tolerance.  Double 
Tipo de datos  Explicación 
Geometry  The generalized geometry. 
getArea ({type}, {units})
Parámetro  Explicación  Tipo de datos 
type  The method used to measure area.
(El valor predeterminado es GEODESIC)  String 
units  The units in which the area will be calculated.
 String 
Tipo de datos  Explicación 
Double  The area of the feature. By default, for projected coordinate systems, area will be returned in the units of the coordinate system, and for geographic coordinate systems, area will be returned in square meters. 
getLength ({measurement_type}, {units})
Parámetro  Explicación  Tipo de datos 
measurement_type  The method used to measure length.
(El valor predeterminado es GEODESIC)  String 
units  The units in which the length will be calculated.
 String 
Tipo de datos  Explicación 
Double  The length of the feature. By default, for projected coordinate systems, length will be returned in the units of the coordinate system, and for geographic coordinate systems, length will be returned in square meters. 
getPart ({index})
Parámetro  Explicación  Tipo de datos 
index  The index position of the geometry.  Integer 
Tipo de datos  Explicación 
Array  The resultant Array object. 
intersect (other, dimension)
Parámetro  Explicación  Tipo de datos 
other  The second geometry.  Object 
dimension  The topological dimension (shape type) of the resulting geometry.
 Integer 
Tipo de datos  Explicación 
Object  A new geometry (point, multipoint, polyline, or polygon) that is the geometric intersection of the two input geometries. 
measureOnLine (in_point, {use_percentage})
Parámetro  Explicación  Tipo de datos 
in_point  A point (PointGeometry or Point) that is used to measure from the start point of the polyline.  PointGeometry 
use_percentage  If False, the measure will be returned as a distance; if True, the measure will be returned as a percentage. (El valor predeterminado es False)  Boolean 
Tipo de datos  Explicación 
Double  A distance or percentage. 
overlaps (second_geometry)
Parámetro  Explicación  Tipo de datos 
second_geometry  A second geometry.  Object 
Tipo de datos  Explicación 
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})
Parámetro  Explicación  Tipo de datos 
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.
(El valor predeterminado es GEODESIC)  String 
Tipo de datos  Explicación 
PointGeometry  Returns a point at a given angle and distance in degrees and meters. 
positionAlongLine (value, {use_percentage}, {geodesic})
Parámetro  Explicación  Tipo de datos 
value  The distance along the line. If the distance is less than zero, the starting point of the line will be returned; if the distance is greater than the length of the line, the endpoint of the line will be returned.  Double 
use_percentage  Specifies whether the distance is specified as a fixed unit of measure or a ratio of the length of the line. If True, value is used as a percentage; if False, value is used as a distance. For percentages, the value should be expressed as a double from 0.0 (0 percent) to 1.0 (100 percent). (El valor predeterminado es False)  Boolean 
geodesic  Specifies whether the distance measure is geodesic or planar. If True, the distance measure is treated as geodesic; if False, the distance measure is treated as planar. (El valor predeterminado es False)  Boolean 
Tipo de datos  Explicación 
PointGeometry  The point on the line at a specified distance from the beginning of the line. 
projectAs (spatial_reference, {transformation_name})
Parámetro  Explicación  Tipo de datos 
spatial_reference  The new spatial reference. This can be a SpatialReference object or the coordinate system name.  SpatialReference 
transformation_name  The geotransformation name.  String 
Tipo de datos  Explicación 
Object  The projected geometry. 
queryPointAndDistance (in_point, {as_percentage})
Parámetro  Explicación  Tipo de datos 
in_point  The input point (PointGeometry or Point).  PointGeometry 
as_percentage  If False, the measure will be returned as a distance; if True, the measure will be returned as a percentage. (El valor predeterminado es False)  Boolean 
Tipo de datos  Explicación 
tuple  Returns a tuple that includes the following:

segmentAlongLine (start_measure, end_measure, {use_percentage})
Parámetro  Explicación  Tipo de datos 
start_measure  The starting distance from the beginning of the line.  Double 
end_measure  The ending distance from the beginning of the line.  Double 
use_percentage  The start and end measures may be specified as fixed units or as a ratio. If True, start_measure and end_measure are used as a percentage; if False, start_measure and end_measure are used as a distance. For percentages, the measures should be expressed as a double from 0.0 (0 percent) to 1.0 (100 percent). (El valor predeterminado es False)  Boolean 
Tipo de datos  Explicación 
PolyLine  The segment of the line between two points. 
snapToLine (in_point)
Parámetro  Explicación  Tipo de datos 
in_point  A point (PointGeometry or Point) to be snapped to the line.  PointGeometry 
Tipo de datos  Explicación 
PointGeometry  The snapped point. 
symmetricDifference (other)
Parámetro  Explicación  Tipo de datos 
other  A second geometry.  Object 
Tipo de datos  Explicación 
Object  The resulting geometry. 
touches (second_geometry)
Parámetro  Explicación  Tipo de datos 
second_geometry  A second geometry.  Object 
Tipo de datos  Explicación 
Boolean  A return Boolean value of True indicates the boundaries of the geometries intersect. 
union (other)
Parámetro  Explicación  Tipo de datos 
other  A second geometry.  Object 
Tipo de datos  Explicación 
Object  The resulting geometry. 
within (second_geometry, {relation})
Parámetro  Explicación  Tipo de datos 
second_geometry  A second geometry.  Object 
relation  The spatial relationship type.
(El valor predeterminado es None)  String 
Tipo de datos  Explicación 
Boolean  A return Boolean value of True indicates this geometry is contained within the second geometry. 
Muestra de código
When you set the output parameter of a geoprocessing tool to an empty Geometry object, the tool will return a list of Geometry objects.
import arcpy
# Run the Copy Features tool, setting the output to the geometry object.
# geometries is returned as a list of geometry objects.
geometries = arcpy.CopyFeatures_management("c:/data/streets.shp",
arcpy.Geometry())
# Walk through each geometry, totaling the length
length = 0
for geometry in geometries:
length += geometry.length
print("Total length: {0}".format(length))