ArcPyを使用して2つのフィーチャクラスが同じ空間参照を持っているかどうかを確認していますか？

arcpyを使用して、2つのフィーチャクラスが同じ空間参照を持っているかどうかをどのように確認しますか？

2つが等しいかどうかを確認するだけでは機能しません。

>>> import arcpy
>>> fc1 = r"C:\Users\e1b8\Desktop\E1B8\GIS_Stackexchange\data.gdb\test"
>>> sr1 = arcpy.Describe (fc1).spatialReference 
>>> sr2 = arcpy.Describe (fc1).spatialReference
>>> sr1 == sr2
False

factoryCode カスタムプロジェクションにはないため、機能しません。

>>> fc2 = r"C:\Users\e1b8\Desktop\E1B8\GIS_Stackexchange\data.gdb\customproj"
>>> sr2 = arcpy.Describe (fc2).spatialReference
>>> sr2.factoryCode
0

はありますnameが、名前は同じでも、単位が異なっていてもかまいません。

>>> sr1 = arcpy.Describe (fc1).spatialReference
>>> sr2 = arcpy.Describe (fc2).spatialReference
>>> sr1.name
u'NAD_1983_UTM_Zone_10N'
>>> sr2.name
u'NAD_1983_UTM_Zone_10N'
>>> sr1.linearUnitCode
9003
>>> sr2.linearUnitCode
9001

したがって、少し複雑になります。私が思いついた最高のものは：

>>> def CompareSRs (inFc1, inFc2):
    sr1 = arcpy.Describe (inFc1).spatialReference
    sr2 = arcpy.Describe (inFc2).spatialReference
    if not sr1.name != sr2.name:
        return False
    srType = sr1.type
    if srType != sr2.type:
        return False
    if srType == "Geographic":
        return sr1.angularUnitCode == sr2.angularUnitCode
    return sr1.linearUnitCode == sr2.linearUnitCode

そして、私はまだ上記のコードが気密であるかどうかわかりません。もっと良い方法はありますか？

コメントから判断すると、すでに持っているかもしれません:)

空間参照のWell-Known Text（WKT）記述を比較できます。

sr1 = arcpy.Describe(dataset1).spatialReference
sr2 = arcpy.Describe(dataset2).spatialReference
sr1String = sr1.exportToString()
sr2String = sr2.exportToString()

matching = False

if sr1String == sr2String:
    # Exact string match
    matching = True
else:
    # difference
    pass

Arcバージョン：10.3

2019年に誰かがこれをまだ見つけている場合に備えて、私は同様の問題があり、予測が一致するかどうかをできるだけ確実にしたかったのです。上記の質問/回答と同様に、を使用して空間参照を取得できますarcpy.Describe(dataset).spatialReference。私の関数ライブラリで、これをワークフローに統合し、2つのデータセットの比較を処理するように設定します。

ジオプロセシング空間参照オブジェクトの個々の属性は、こちらから入手できます。

以下の関数が役立つはずです-もちろん自由に使用/修正してください。省略されているものをチェックする価値があります-空間参照系の一部の属性は、一致しない場合は無害ですが、それはあなた次第です。

import arcpy


def check_crs(dataset):
    """Return a coordinate reference system string

    Get coordinate reference system of dataset
    """
    crs = arcpy.Describe(dataset).spatialReference
    return(crs)

def assert_crs_attribs(dataset1, dataset2, strict=False): 
    """Returns Nothing

    Asserts equality of all attributes of the provided geoprocessing spatial reference objects.
    These are generated using arcpy.Describe(your_dataset).spatialReference.
    Attributes of spatial reference object: https://pro.arcgis.com/en/pro-app/arcpy/classes/spatialreference.htm

    dataset1 - a spatial dataset with projection info e.g. shp
    dataset2 - a spatial dataset with projection info e.g. shp
    strict - boolean - if True will compare every element (default: False)
    """
    crs1=check_crs(dataset1)
    crs2=check_crs(dataset2)

    try:
        # Consider these
        assert(crs1.name==crs2.name) # The name of the spatial reference.
        assert(crs1.PCSCode==crs2.PCSCode) # The projected coordinate system code.1 
        assert(crs1.PCSName==crs2.PCSName) # The projected coordinate system name.1 
        assert(crs1.azimuth==crs2.azimuth) # The azimuth of a projected coordinate system.1 
        assert(crs1.centralMeridian==crs2.centralMeridian) # The central meridian of a projected coordinate system.1    
        assert(crs1.centralMeridianInDegrees==crs2.centralMeridianInDegrees) # The central meridian (Lambda0) of a projected coordinate system in degrees.1 
        assert(crs1.centralParallel==crs2.centralParallel) # The central parallel of a projected coordinate system.1
        assert(crs1.falseEasting==crs2.falseEasting) # The false easting of a projected coordinate system.1 
        assert(crs1.falseNorthing==crs2.falseNorthing) # The false northing of a projected coordinate system.1  
        assert(crs1.MFalseOriginAndUnits==crs2.MFalseOriginAndUnits) # The measure false origin and units.
        assert(crs1.MResolution==crs2.MResolution) # The measure resolution.
        assert(crs1.MTolerance==crs2.MTolerance) # The measure tolerance.
        assert(crs1.XYTolerance==crs2.XYTolerance) # The xy tolerance.
        assert(crs1.ZDomain==crs2.ZDomain) # The extent of the z domain.
        assert(crs1.ZFalseOriginAndUnits==crs2.ZFalseOriginAndUnits) # The z false origin and units.
        assert(crs1.factoryCode==crs2.factoryCode) # The factory code or well-known ID (WKID) of the spatial reference.
        assert(crs1.isHighPrecision==crs2.isHighPrecision) # Indicates whether the spatial reference has high precision set.
        assert(crs1.latitudeOf1st==crs2.latitudeOf1st) # The latitude of the first point of a projected coordinate system.1
        assert(crs1.latitudeOf2nd==crs2.latitudeOf2nd) # The latitude of the second point of a projected coordinate system.1    
        assert(crs1.latitudeOfOrigin==crs2.latitudeOfOrigin) # The latitude of origin of a projected coordinate system.1    
        assert(crs1.linearUnitCode==crs2.linearUnitCode) # The linear unit code.    
        assert(crs1.linearUnitName==crs2.linearUnitName) # The linear unit name.1
        assert(crs1.longitude==crs2.longitude) # The longitude value of this prime meridian.1
        assert(crs1.longitudeOf1st==crs2.longitudeOf1st) #The longitude of the first point of a projected coordinate system.1
        assert(crs1.longitudeOf2nd==crs2.longitudeOf2nd) # The longitude of the second point of a projected coordinate system.1
        assert(crs1.longitudeOfOrigin==crs2.longitudeOfOrigin) # The longitude of origin of a projected coordinate system.1
        assert(crs1.metersPerUnit==crs2.metersPerUnit) # The meters per linear unit.1
        assert(crs1.projectionCode==crs2.projectionCode) # The projection code.1
        assert(crs1.projectionName==crs2.projectionName) # The projection name.1
        assert(crs1.scaleFactor==crs2.scaleFactor) # The scale factor of a projected coordinate system.1
        assert(crs1.standardParallel1==crs2.standardParallel1) # The first parallel of a projected coordinate system.1
        assert(crs1.standardParallel2==crs2.standardParallel2) # The second parallel of a projected coordinate system.1
        assert(crs1.angularUnitCode==crs2.angularUnitCode) # The angular unit code.2
        assert(crs1.angularUnitName==crs2.angularUnitName) # The angular unit name.2
        assert(crs1.datumCode==crs2.datumCode) # The datum code.2
        assert(crs1.datumName==crs2.datumName) # The datum name.2
        assert(crs1.flattening==crs2.flattening) # The flattening ratio of this spheroid.2
        assert(crs1.longitude==crs2.longitude) # The longitude value of this prime meridian.2
        assert(crs1.primeMeridianCode==crs2.primeMeridianCode) # The prime meridian code.2

        ## Prob can be ignored
        if strict:
            assert(crs1.ZResolution==crs2.ZResolution) # The z resolution property.
            assert(crs1.ZTolerance==crs2.ZTolerance) # The z-tolerance property.
            assert(crs1.hasMPrecision==crs2.hasMPrecision) # Indicates whether m-value precision information has been defined.
            assert(crs1.hasXYPrecision==crs2.hasXYPrecision) # Indicates whether xy precision information has been defined.
            assert(crs1.hasZPrecision==crs2.hasZPrecision) # Indicates whether z-value precision information has been defined.
            assert(crs1.XYResolution==crs2.XYResolution) # The xy resolution.
            assert(crs1.domain==crs2.domain) # The extent of the xy domain.
            assert(crs1.MDomain==crs2.MDomain) # The extent of the measure domain.
            assert(crs1.remarks==crs2.remarks) # The comment string of the spatial reference.
            assert(crs1.type==crs2.type) # The type of the spatial reference. Geographic: A geographic coordinate system. Projected: A projected coordinate system.
            assert(crs1.usage==crs2.usage) # The usage notes.   
            assert(crs1.classification==crs2.classification) # The classification of a map projection.1 
            assert(crs1.GCSCode==crs2.GCSCode) # The geographic coordinate system code.2
            assert(crs1.GCSName==crs2.GCSName) # The geographic coordinate system name.2
            assert(crs1.primeMeridianName==crs2.primeMeridianName) # The prime meridian name.2
            assert(crs1.radiansPerUnit==crs2.radiansPerUnit) # The radians per angular unit.2
            assert(crs1.semiMajorAxis==crs2.semiMajorAxis) # The semi-major axis length of this spheroid.2
            assert(crs1.semiMinorAxis==crs2.semiMinorAxis) # The semi-minor axis length of this spheroid.2
            assert(crs1.spheroidCode==crs2.spheroidCode) # The spheroid code.2
            assert(crs1.spheroidName==crs2.spheroidName) # The spheroid name.2
        return(True)
    except:
        output_message="CRS differs between datasets."#\ncrs1: %s\ncrs2 : %s" %(crs1.exportToString(), crs2.exportToString())
        print(output_message)
        return(False)
    ## Differs to the falseEasting and falseNorthingUnits are odd on occasion but false eastings and northings make sense
    # crs.falseOriginAndUnits # The false origin and units.

    ## Not required
    #crs.GCS # A projected coordinate system returns a SpatialReference object for the geographic coordinate system it is based on. A geographic crs.coordinate system returns the same SpatialReference.
    #crs.SpatialReference
    #crs.VCS # If the coordinate system has a vertical coordinate system, it returns a VCS object for the vertical coordinate system it is based on.
    #crs.abbreviation # The abbreviated name of the spatial reference.
    #crs.alias # The alias of the spatial reference.

上記の場合、次のように使用できます。

dataset1="your_vector_1.shp"
dataset2="your_vector_2.shp"

assert_crs_attribs(dataset1, dataset2)

あなたのユースケースを考えると、うまくいけば、アサートは失敗しないでしょう。

これらの関数を、結合している空間データセットの範囲があり、物事が正しく調整されていないという疑いを排除したい場合など、多くのプロセスに統合します。