## 概要

A Polygon object is a closed shape defined by a connected sequence of x,y coordinate pairs.

## ディスカッション

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。

## 構文

Polygon (inputs, {spatial_reference}, {has_z}, {has_m})

パラメーター | 説明 | データ タイプ |

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. (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 Python json.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. It is zero for point and multipoint feature types. | Double |

length3D (読み書き) | The 3D length of the linear feature. It is zero for point and multipoint feature types. | 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 |

## 手法の概要

手法 | 説明 |

angleAndDistanceTo (other, {method}) | Returns a tuple of angle and distance to another point using a measurement type. |

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. 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 of point objects for a particular part of geometry or an array containing a number of arrays, one for each part. 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. |

positionAlongLine (value, {use_percentage}) | 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 needs to have a spatial reference, and not have an UnknownCoordinateSystem. 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 measure 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. |

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. |

## 手法

angleAndDistanceTo (other, {method})

パラメーター | 説明 | データ タイプ |

other | The second geometry. | PointGeometry |

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, and PRESERVE_SHAPE measurement types may 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.
(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. - 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.
(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. |

cut (cutter)

パラメーター | 説明 | データ タイプ |

cutter | The cutting polyline geometry. | PolyLine |

データ タイプ | 説明 |

Geometry | A list of two geometries. |

densify (type, distance, {deviation})

パラメーター | 説明 | データ タイプ |

type | The type of densification, DISTANCE, ANGLE, or GEODESIC. - DISTANCE —Creates a new feature that is a piecewise linear approximation of the input.
- ANGLE —Creates a new feature that is a piecewise linear approximation of the input. Vertices are introduced at points where the angle between tangents at those points is the provided angle.
- GEODESIC —Densifies and reshapes segments between input vertices so that the output segments follow the shortest ground path connecting input vertices.
| 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 |

データ タイプ | 説明 |

Geometry | The densified geometry. |

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. |

generalize (max_offset)

パラメーター | 説明 | データ タイプ |

max_offset | The maximum offset tolerance. | Double |

データ タイプ | 説明 |

Geometry | The generalized geometry. |

getArea ({type}, {units})

パラメーター | 説明 | データ タイプ |

type | 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, and PRESERVE_SHAPE measurement types may 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.
(デフォルト値は次のとおりです GEODESIC) | String |

units | The units in which the area will be calculated. - ACRES —Acres
- ARES —Ares
- HECTARES —Hectares
- SQUARECENTIMETERS —Square centimeters
- SQUAREDECIMETERS —Square decimeters
- SQUAREFEET —Square feet
- SQUAREINCHES —Square inches
- SQUAREKILOMETERS —Square kilometers
- SQUAREMETERS —Square meters
- SQUAREMILES —Square miles
- SQUAREMILLIMETERS —Square millimeters
- SQUAREYARDS —Square yards
| String |

データ タイプ | 説明 |

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})

パラメーター | 説明 | データ タイプ |

measurement_type | 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, and PRESERVE_SHAPE measurement types may 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.
(デフォルト値は次のとおりです GEODESIC) | String |

units | The units in which the length will be calculated. - CENTIMETERS —Centimeters
- DECIMETERS —Decimeters
- FEET —Feet
- INCHES —Inches
- KILOMETERS —Kilometers
- METERS —Meters
- MILES —Miles
- MILLIMETERS —Millimeters
- NAUTICALMILES —Nautical Miles
- YARDS —Yards
| String |

データ タイプ | 説明 |

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})

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 | getPart returns an array of point objects for a particular part of the geometry if an index is specified. If an index is not specified, an array containing an array of point objects for each geometry part is returned. |

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. - 1 —A zero-dimensional geometry (point or multipoint).
- 2 —A one-dimensional geometry (polyline).
- 4 —A two-dimensional geometry (polygon).
| 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. - 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.
(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. |

positionAlongLine (value, {use_percentage})

パラメーター | 説明 | データ タイプ |

value | The distance along the line. If the distance is less than zero, then the starting point of the line will be returned; if the distance is greater than the length of the line, then the end point of the line will be returned. | Double |

use_percentage | The distance may be 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%) to 1.0 (100%). (デフォルト値は次のとおりです False) | Boolean |

データ タイプ | 説明 |

PointGeometry | The point on the line at a specified distance from the beginning of the line. |

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. |

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. - 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.
(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 polygon feature class from scratch.

```
import arcpy
# 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 Polygon objects
features = []
# Create Polygon objects based an the array of points
for feature in feature_info:
array = arcpy.Array([arcpy.Point(*coords) for coords in feature])
# Add the first coordinate pair to the end to close polygon
array.append(array[0])
features.append(arcpy.Polygon(array))
# Persist a copy of the geometry objects using CopyFeatures
arcpy.CopyFeatures_management(features, "c:/geometry/polygons.shp")
```