SpatialReference

サマリ

Each part of the spatial reference has a number of properties, especially the coordinate system, which defines what map projection options are used to define horizontal coordinates.

説明

A SpatialReference can be easily created from existing datasets and PRJ files:

  1. Use a PRJ file as an argument to the SpatialReference class.
    import arcpy, os
prjFile = os.path.join(arcpy.GetInstallInfo()["InstallDir"],
                       "Coordinate Systems/Geographic Coordinate Systems/North America/NAD 1983.prj")
spatialRef = arcpy.SpatialReference(prjFile)
  2. Describe a dataset and access its spatialReference property.
    dataset = "C:/Data/Landbase.gdb/Wetlands"
spatialRef = arcpy.Describe(dataset).spatialReference
注意注意:

Which spatial reference properties are available depends on the coordinate system used. In the properties list below, those properties only available with a Projected Coordinate system are denoted with a 1; properties available only with a Geographic Coordinate system are denoted with a 2.

構文

SpatialReference (prjFile)
パラメータ説明データ タイプ
prjFile

The projection file used to populate the spatial reference object.

String

プロパティ

プロパティ説明データ タイプ
MDomain
（読み取り専用）

The extent of the measure domain.

String
MFalseOriginAndUnits
（読み取り専用）

The measure false origin and units.

String
MResolution
（読み書き）

The measure resolution.

Double
MTolerance
（読み書き）

The measure tolerance.

Double
XYResolution
（読み書き）

The xy resolution.

Double
XYTolerance
（読み書き）

The xy tolerance.

Double
ZDomain
（読み取り専用）

The extent of the Z domain.

String
ZFalseOriginAndUnits
（読み取り専用）

The Z false origin and units.

String
ZResolution
（読み書き）

The Z resolution property.

Double
ZTolerance
（読み書き）

The Z tolerance property.

Double
abbreviation
（読み書き）

The abbreviated name of the spatial reference.

String
alias
（読み書き）

The alias of the spatial reference.

String
domain
（読み取り専用）

The extent of the xy domain.

String
factoryCode
（読み書き）

The factory code of the spatial reference.

Integer
falseOriginAndUnits
（読み取り専用）

The false origin and units.

String
hasMPrecision
（読み取り専用）

Indicates whether or not m-value precision information has been defined.

Boolean
hasXYPrecision
（読み取り専用）

Indicates whether or not xy precision information has been defined.

Boolean
hasZPrecision
（読み取り専用）

Indicates whether or not z-value precision information has been defined.

Boolean
isHighPrecision
（読み書き）

Indicates whether or not the spatial reference has high precision set.

Boolean
name
（読み書き）

The name of the spatial reference.

String
remarks
（読み書き）

The comment string of the spatial reference.

String
type
（読み書き）

The type of the spatial reference.

String
usage
（読み取り専用）

The usage notes.

String
PCSCode
（読み書き）

The projected coordinate system code.1

Integer
PCSName
（読み書き）

The projected coordinate system name.1

String
azimuth
（読み書き）

The azimuth of a projected coordinate system.1

Double
centralMeridian
（読み書き）

The central meridian of a projected coordinate system.1

Double
centralMeridianInDegrees
（読み書き）

The central meridian (Lambda0) of a projected coordinate system in degrees.1

Double
centralParallel
（読み書き）

The central parallel of a projected coordinate system.1

Double
classification
（読み取り専用）

The classification of a map projection.1

String
falseEasting
（読み書き）

The false easting of a projected coordinate system.1

Double
falseNorthing
（読み書き）

The false northing of a projected coordinate system.1

Double
latitudeOf1st
（読み書き）

The latitude of the first point of a projected coordinate system.1

Double
latitudeOf2nd
（読み書き）

The latitude of the second point of a projected coordinate system.1

Double
linearUnitCode
（読み書き）

The linear unit code.1

Integer
linearUnitName
（読み書き）

The linear unit name.1

String
longitude
（読み書き）

The longitude value of this prime meridian.1

Double
longitudeOf1st
（読み書き）

The longitude of the first point of a projected coordinate system.1

Double
longitudeOf2nd
（読み書き）

The longitude of the second point of a projected coordinate system.1

Double
longitudeOfOrigin
（読み書き）

The longitude of origin of a projected coordinate system.1

Double
projectionCode
（読み書き）

The projection code.1

Integer
projectionName
（読み書き）

The projection name.1

String
scaleFactor
（読み書き）

The scale factor of a projected coordinate system.1

Double
standardParallel1
（読み書き）

The first parallel of a projected coordinate system.1

Double
standardParallel2
（読み書き）

The second parallel of a projected coordinate system.1

Double
GCSCode
（読み書き）

The geographic coordinate system code.2

Integer
GCSName
（読み書き）

The geographic coordinate system name.2

String
angularUnitCode
（読み書き）

The angular unit code.2

Integer
angularUnitName
（読み書き）

The angular unit name.2

String
datumCode
（読み書き）

The datum code.2

Integer
datumName
（読み書き）

The datum name.2

String
flattening
（読み書き）

The flattening ratio of this spheroid.2

Double
longitude
（読み書き）

The longitude value of this prime meridian.2

Double
primeMeridianCode
（読み書き）

The prime meridian code.2

Integer
primeMeridianName
（読み書き）

The prime meridian name.2

String
radiansPerUnit
（読み取り専用）

The radians per angular unit.2

Double
semiMajorAxis
（読み書き）

The semi-major axis length of this spheroid.2

Double
semiMinorAxis
（読み書き）

The semi-minor axis length of this spheroid.2

Double
spheroidCode
（読み書き）

The spheroid code.2

Integer
spheroidName
（読み書き）

The spheroid name.2

String

メソッドの概要

メソッド説明
create ()

Creates the spatial reference object using properties.

createFromFile (prj_file)

Creates the spatial reference object from a projection file.

exportToString ()

Exports the object to its string representation.

loadFromString (string)

Restore the object using its string representation. The exportToString method can be used to create a string representation.

setDomain (x_min, x_max, y_min, y_max)

Sets the XY domain.

setFalseOriginAndUnits (false_x, false_y, xy_units)

Sets the XY false origin and units.

setMDomain (m_min, m_max)

Sets the M domain.

setZDomain (z_min, z_max)

Sets the Z domain.

setMFalseOriginAndUnits (false_m, m_units)

Sets the M false origin and units.

setZFalseOriginAndUnits (false_z, z_units)

Sets the Z false origin and units.

メソッド

create ()
createFromFile (prj_file)
パラメータ説明データ タイプ
prj_file

The projection file used to populate the spatial reference object.

String
exportToString ()
リターン
データ タイプ説明
String

The string representation of the object.

loadFromString (string)
パラメータ説明データ タイプ
string

The string representation of the object.

String
setDomain (x_min, x_max, y_min, y_max)
パラメータ説明データ タイプ
x_min

The minimum x-value.

Double
x_max

The maximum x-value.

Double
y_min

The minimum y-value.

Double
y_max

The maximum y-value.

Double
setFalseOriginAndUnits (false_x, false_y, xy_units)
パラメータ説明データ タイプ
false_x

The false x value.

Double
false_y

The false y value.

Double
xy_units

The xy units.

String
setMDomain (m_min, m_max)
パラメータ説明データ タイプ
m_min

The minimum m-value.

Double
m_max

The maximum m-value.

Double
setZDomain (z_min, z_max)
パラメータ説明データ タイプ
z_min

The minimum z-value.

Double
z_max

The maximum z-value.

Double
setMFalseOriginAndUnits (false_m, m_units)
パラメータ説明データ タイプ
false_m

The false m-value.

Double
m_units

The m units.

Double
setZFalseOriginAndUnits (false_z, z_units)
パラメータ説明データ タイプ
false_z

The false z-value.

Double
z_units

The false z units.

Double

コードのサンプル

SpatialReference example

For each feature class in a workspace, print the name of its spatial reference.

import arcpy
from arcpy import env

# Set the workspace environment
#
env.workspace = "C:/base/base.gdb"

# Get a list of the feature classes in the input folder
#
fcs = arcpy.ListFeatureClasses()

# Loop through the list
#
for fc in fcs:
    # Create the spatial reference object
    #
    sr = arcpy.Describe(fc).spatialReference

    # If the spatial reference is unknown
    #
    if sr.name == "Unknown":
        print fc + " has an unknown spatial reference\n"

    # Otherwise, print out the feature class name and
    #   spatial reference
    #
    else:
        print fc + ": " + sr.name + "\n"
SpatialReference example 2

Create a SpatialReference using a .prj file.

import arcpy

prjFile = "c:/Program Files/ArcGIS/Desktop10.0/Coordinate Systems/Projected Coordinate Systems" + \
           "/Continental/North America/USA Contiguous Equidistant Conic.prj"

# Create a spatial reference object using a projection file
#
sr = arcpy.SpatialReference(prjFile)
SpatialReference example 3

Create a SpatialReference from a factory code.

import arcpy

# Create a spatial reference object using a factory code
#
sr = arcpy.SpatialReference()
sr.factoryCode = 3857
sr.create()

関連項目

Python でのクラスの使用

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7/10/2012