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다각형을 처리하는 함수

WKT​

다양한 Geo Data Types에서 WKT(Well Known Text) 기하 객체를 반환합니다. 지원되는 WKT 객체는 다음과 같습니다.

  • POINT
  • POLYGON
  • MULTIPOLYGON
  • LINESTRING
  • MULTILINESTRING

구문

WKT(geo_data)

매개변수

geo_data는 다음 Geo 데이터 타입 중 하나이거나 해당 타입의 기본 원시 타입일 수 있습니다:

반환 값

  • Point의 경우 WKT 기하 객체 POINT가 반환됩니다.
  • Polygon의 경우 WKT 기하 객체 POLYGON이 반환됩니다.
  • MultiPolygon의 경우 WKT 기하 객체 MULTIPOLYGON이 반환됩니다.
  • LineString의 경우 WKT 기하 객체 LINESTRING이 반환됩니다.
  • MultiLineString의 경우 WKT 기하 객체 MULTILINESTRING이 반환됩니다.

예시

튜플에서 POINT 생성:

SELECT wkt((0., 0.));

POINT(0 0)

튜플 배열 또는 튜플 배열의 배열에서 생성되는 POLYGON:

SELECT wkt([(0., 0.), (10., 0.), (10., 10.), (0., 10.)]);

POLYGON((0 0,10 0,10 10,0 10))

다차원 튜플 배열로 구성된 배열에서 생성된 MULTIPOLYGON:

SELECT wkt([[[(0., 0.), (10., 0.), (10., 10.), (0., 10.)], [(4., 4.), (5., 4.), (5., 5.), (4., 5.)]], [[(-10., -10.), (-10., -9.), (-9., 10.)]]]);

MULTIPOLYGON(((0 0,10 0,10 10,0 10,0 0),(4 4,5 4,5 5,4 5,4 4)),((-10 -10,-10 -9,-9 10,-10 -10)))

readWKTMultiPolygon​

WKT(Well-known Text) 형식의 MultiPolygon을 MultiPolygon 형식으로 변환합니다.

예시​

SELECT
    toTypeName(readWKTMultiPolygon('MULTIPOLYGON(((2 0,10 0,10 10,0 10,2 0),(4 4,5 4,5 5,4 5,4 4)),((-10 -10,-10 -9,-9 10,-10 -10)))')) AS type,
    readWKTMultiPolygon('MULTIPOLYGON(((2 0,10 0,10 10,0 10,2 0),(4 4,5 4,5 5,4 5,4 4)),((-10 -10,-10 -9,-9 10,-10 -10)))') AS output FORMAT Markdown
typeoutput
MultiPolygon[[[(2,0),(10,0),(10,10),(0,10),(2,0)],[(4,4),(5,4),(5,5),(4,5),(4,4)]],[[(-10,-10),(-10,-9),(-9,10),(-10,-10)]]]

입력 매개변수​

MULTIPOLYGON으로 시작하는 문자열(String)

반환 값​

MultiPolygon

readWKTPolygon​

WKT(Well Known Text) 형식의 MultiPolygon을 Polygon 타입으로 변환합니다.

예시​

SELECT
    toTypeName(readWKTPolygon('POLYGON((2 0,10 0,10 10,0 10,2 0))')) AS type,
    readWKTPolygon('POLYGON((2 0,10 0,10 10,0 10,2 0))') AS output
FORMAT Markdown
typeoutput
Polygon[[(2,0),(10,0),(10,10),(0,10),(2,0)]]

입력 매개변수​

POLYGON으로 시작하는 문자열

반환 값​

Polygon

readWKTPoint​

ClickHouse의 readWKTPoint FUNCTION은 Point 기하 객체의 Well-Known Text (WKT) 표현을 구문 분석하여 ClickHouse 내부 형식의 Point 값을 반환합니다.

구문​

readWKTPoint(wkt_string)

인수​

  • wkt_string: Point 지오메트리를 나타내는 입력 WKT 문자열입니다.

반환 값​

함수는 Point 지오메트리의 ClickHouse 내부 표현을 반환합니다.

예시​

SELECT readWKTPoint('POINT (1.2 3.4)');

(1.2,3.4)

readWKTLineString​

Well-Known Text (WKT) 형식으로 표현된 LineString 지오메트리를 파싱하여 ClickHouse의 내부 형식으로 반환합니다.

구문​

readWKTLineString(wkt_string)

인수​

  • wkt_string: LineString 지오메트리를 나타내는 입력 WKT 문자열입니다.

반환 값​

이 FUNCTION은 LineString 지오메트리의 ClickHouse 내부 표현을 반환합니다.

예시​

SELECT readWKTLineString('LINESTRING (1 1, 2 2, 3 3, 1 1)');

[(1,1),(2,2),(3,3),(1,1)]

readWKTMultiLineString​

MultiLineString 지오메트리의 Well-Known Text (WKT) 표현을 파싱하여 ClickHouse 내부 형식으로 반환합니다.

구문​

readWKTMultiLineString(wkt_string)

인수​

  • wkt_string: MultiLineString 지오메트리를 나타내는 입력 WKT 문자열입니다.

반환 값​

이 FUNCTION은 MultiLineString 지오메트리의 ClickHouse 내부 표현을 반환합니다.

예시​

SELECT readWKTMultiLineString('MULTILINESTRING ((1 1, 2 2, 3 3), (4 4, 5 5, 6 6))');

[[(1,1),(2,2),(3,3)],[(4,4),(5,5),(6,6)]]

readWKTRing​

Polygon 지오메트리의 Well-Known Text (WKT) 표현을 파싱하여 ClickHouse 내부 형식의 링(닫힌 linestring)을 반환합니다.

구문​

readWKTRing(wkt_string)

인수​

  • wkt_string: Polygon 지오메트리를 나타내는 입력 WKT 문자열입니다.

반환 값​

이 FUNCTION은 링(폐쇄된 LineString) 지오메트리에 대한 ClickHouse 내부 표현을 반환합니다.

예시​

SELECT readWKTRing('POLYGON ((1 1, 2 2, 3 3, 1 1))');

[(1,1),(2,2),(3,3),(1,1)]

polygonsWithinSpherical​

한 다각형이 다른 다각형 안에 완전히 포함되어 있는지에 따라 true 또는 false를 반환합니다. 자세한 내용은 https://www.boost.org/doc/libs/1_62_0/libs/geometry/doc/html/geometry/reference/algorithms/within/within_2.html 을(를) 참고하십시오.

예시​

SELECT polygonsWithinSpherical([[[(4.3613577, 50.8651821), (4.349556, 50.8535879), (4.3602419, 50.8435626), (4.3830299, 50.8428851), (4.3904543, 50.8564867), (4.3613148, 50.8651279)]]], [[[(4.346693, 50.858306), (4.367945, 50.852455), (4.366227, 50.840809), (4.344961, 50.833264), (4.338074, 50.848677), (4.346693, 50.858306)]]]);

0

readWKBMultiPolygon​

WKB(Well Known Binary) 형식의 MultiPolygon을 MultiPolygon 타입으로 변환합니다.

예제​

SELECT
    toTypeName(readWKBMultiPolygon(unhex('0106000000020000000103000000020000000500000000000000000000400000000000000000000000000000244000000000000000000000000000002440000000000000244000000000000000000000000000002440000000000000004000000000000000000500000000000000000010400000000000001040000000000000144000000000000010400000000000001440000000000000144000000000000010400000000000001440000000000000104000000000000010400103000000010000000400000000000000000024c000000000000024c000000000000024c000000000000022c000000000000022c0000000000000244000000000000024c000000000000024c0'))) AS type,
    readWKBMultiPolygon(unhex('0106000000020000000103000000020000000500000000000000000000400000000000000000000000000000244000000000000000000000000000002440000000000000244000000000000000000000000000002440000000000000004000000000000000000500000000000000000010400000000000001040000000000000144000000000000010400000000000001440000000000000144000000000000010400000000000001440000000000000104000000000000010400103000000010000000400000000000000000024c000000000000024c000000000000024c000000000000022c000000000000022c0000000000000244000000000000024c000000000000024c0')) AS output FORMAT Markdown
typeoutput
MultiPolygon[[[(2,0),(10,0),(10,10),(0,10),(2,0)],[(4,4),(5,4),(5,5),(4,5),(4,4)]],[[(-10,-10),(-10,-9),(-9,10),(-10,-10)]]]

입력 매개변수​

MULTIPOLYGON으로 시작하는 문자열

반환 값​

MultiPolygon

readWKBPolygon​

WKB (Well Known Binary) MultiPolygon을 Polygon 형식으로 변환합니다.

예시​

SELECT
    toTypeName(readWKBPolygon(unhex('010300000001000000050000000000000000000040000000000000000000000000000024400000000000000000000000000000244000000000000024400000000000000000000000000000244000000000000000400000000000000000'))) AS type,
    readWKBPolygon(unhex('010300000001000000050000000000000000000040000000000000000000000000000024400000000000000000000000000000244000000000000024400000000000000000000000000000244000000000000000400000000000000000')) AS output
FORMAT Markdown
typeoutput
Polygon[[(2,0),(10,0),(10,10),(0,10),(2,0)]]

입력 매개변수​

POLYGON으로 시작하는 문자열(String)

반환 값​

Polygon

readWKBPoint​

ClickHouse의 readWKBPoint FUNCTION은 Point 기하 도형의 Well-Known Binary(WKB) 표현을 해석하여 ClickHouse 내부 형식의 Point를 반환합니다.

구문​

readWKBPoint(wkb_string)

Arguments​

  • wkb_string: Point 지오메트리를 나타내는 입력 WKB 문자열입니다.

Returned value​

이 함수는 Point 지오메트리의 ClickHouse 내부 표현을 반환합니다.

Example​

SELECT readWKBPoint(unhex('0101000000333333333333f33f3333333333330b40'));

(1.2,3.4)

readWKBLineString​

Well-Known Binary(WKB) 표현의 LineString 지오메트리를 파싱하여 ClickHouse 내부 형식으로 반환합니다.

구문​

readWKBLineString(wkb_string)

인수​

  • wkb_string: LineString 지오메트리를 나타내는 입력 WKB 문자열입니다.

반환 값​

FUNCTION은 LineString 지오메트리의 ClickHouse 내부 표현을 반환합니다.

예시​

SELECT readWKBLineString(unhex('010200000004000000000000000000f03f000000000000f03f0000000000000040000000000000004000000000000008400000000000000840000000000000f03f000000000000f03f'));

[(1,1),(2,2),(3,3),(1,1)]

readWKBMultiLineString​

Well-Known Binary(WKB) 표현을 사용하는 MultiLineString 지오메트리를 파싱하여 ClickHouse 내부 형식으로 반환합니다.

구문​

readWKBMultiLineString(wkb_string)

Arguments​

  • wkb_string: MultiLineString 지오메트리를 표현하는 입력 WKB 문자열입니다.

Returned value​

이 FUNCTION은 MultiLineString 지오메트리의 ClickHouse 내부 표현 형식을 반환합니다.

Example​

SELECT readWKBMultiLineString(unhex('010500000002000000010200000003000000000000000000f03f000000000000f03f0000000000000040000000000000004000000000000008400000000000000840010200000003000000000000000000104000000000000010400000000000001440000000000000144000000000000018400000000000001840'));

[[(1,1),(2,2),(3,3)],[(4,4),(5,5),(6,6)]]

입력 매개변수​

반환 값​

UInt8, 거짓일 때는 0, 참일 때는 1입니다.

polygonsDistanceSpherical​

두 개의 다각형이 있을 때, 첫 번째 다각형에 속한 한 점과 두 번째 다각형에 속한 다른 한 점 사이의 최소 거리를 계산합니다. 「Spherical」은 좌표를 지구가 아닌 순수하고 이상적인 구의 좌표로 해석한다는 의미입니다. 이러한 유형의 좌표계를 사용하면 실행 속도는 빨라지지만, 정확도는 떨어집니다.

예시​

SELECT polygonsDistanceSpherical([[[(0, 0), (0, 0.1), (0.1, 0.1), (0.1, 0)]]], [[[(10., 10.), (10., 40.), (40., 40.), (40., 10.), (10., 10.)]]])

0.24372872211133834

입력 매개변수​

두 개의 다각형

반환값​

Float64

polygonsDistanceCartesian​

두 개의 다각형 사이 거리를 계산합니다.

예시​

SELECT polygonsDistanceCartesian([[[(0, 0), (0, 0.1), (0.1, 0.1), (0.1, 0)]]], [[[(10., 10.), (10., 40.), (40., 40.), (40., 10.), (10., 10.)]]])

14.000714267493642

입력 매개변수​

두 개의 폴리곤

반환 값​

Float64

polygonsEqualsCartesian​

두 다각형이 동일하면 true를 반환합니다.

예시​

SELECT polygonsEqualsCartesian([[[(1., 1.), (1., 4.), (4., 4.), (4., 1.)]]], [[[(1., 1.), (1., 4.), (4., 4.), (4., 1.), (1., 1.)]]])

1

입력 매개변수​

두 개의 다각형

반환 값​

UInt8, 0은 false, 1은 true

polygonsSymDifferenceSpherical​

두 폴리곤 간의 공간 집합론적 대칭차(XOR)를 계산합니다.

예시​

SELECT wkt(arraySort(polygonsSymDifferenceSpherical([[(50., 50.), (50., -50.), (-50., -50.), (-50., 50.), (50., 50.)], [(10., 10.), (10., 40.), (40., 40.), (40., 10.), (10., 10.)], [(-10., -10.), (-10., -40.), (-40., -40.), (-40., -10.), (-10., -10.)]], [[(-20., -20.), (-20., 20.), (20., 20.), (20., -20.), (-20., -20.)]])));

MULTIPOLYGON(((-20 -10.3067,-10 -10,-10 -20.8791,-20 -20,-20 -10.3067)),((10 20.8791,20 20,20 10.3067,10 10,10 20.8791)),((50 50,50 -50,-50 -50,-50 50,50 50),(20 10.3067,40 10,40 40,10 40,10 20.8791,-20 20,-20 -10.3067,-40 -10,-40 -40,-10 -40,-10 -20.8791,20 -20,20 10.3067)))

입력 매개변수​

다각형(Polygons)

반환 값​

멀티다각형(MultiPolygon)

polygonsSymDifferenceCartesian​

polygonsSymDifferenceSpherical과 동일하지만, 좌표가 실제 지구 모델에 더 가까운 데카르트 좌표계로 표현됩니다.

예시​

SELECT wkt(polygonsSymDifferenceCartesian([[[(0, 0), (0, 3), (1, 2.9), (2, 2.6), (2.6, 2), (2.9, 1), (3, 0), (0, 0)]]], [[[(1., 1.), (1., 4.), (4., 4.), (4., 1.), (1., 1.)]]]))

MULTIPOLYGON(((1 2.9,1 1,2.9 1,3 0,0 0,0 3,1 2.9)),((1 2.9,1 4,4 4,4 1,2.9 1,2.6 2,2 2.6,1 2.9)))

입력 매개변수​

폴리곤

반환 값​

멀티폴리곤

polygonsIntersectionSpherical​

다각형 간의 교집합(AND)을 계산하며, 좌표는 구면상 좌표입니다.

예시​

SELECT wkt(arrayMap(a -> arrayMap(b -> arrayMap(c -> (round(c.1, 6), round(c.2, 6)), b), a), polygonsIntersectionSpherical([[[(4.3613577, 50.8651821), (4.349556, 50.8535879), (4.3602419, 50.8435626), (4.3830299, 50.8428851), (4.3904543, 50.8564867), (4.3613148, 50.8651279)]]], [[[(4.346693, 50.858306), (4.367945, 50.852455), (4.366227, 50.840809), (4.344961, 50.833264), (4.338074, 50.848677), (4.346693, 50.858306)]]])))

MULTIPOLYGON(((4.3666 50.8434,4.36024 50.8436,4.34956 50.8536,4.35268 50.8567,4.36794 50.8525,4.3666 50.8434)))

입력 매개변수​

다각형(Polygons)

반환값​

멀티폴리곤(MultiPolygon)

polygonsWithinCartesian​

두 번째 폴리곤이 첫 번째 폴리곤 안에 있으면 true를 반환합니다.

예시​

SELECT polygonsWithinCartesian([[[(2., 2.), (2., 3.), (3., 3.), (3., 2.)]]], [[[(1., 1.), (1., 4.), (4., 4.), (4., 1.), (1., 1.)]]])

1

입력 매개변수​

두 개의 다각형

반환 값​

UInt8, 거짓인 경우 0, 참인 경우 1

polygonsIntersectCartesian​

두 다각형이 서로 교차하여(공통 영역이나 경계를 일부라도 공유하는 경우) true를 반환합니다.

예시​

SELECT polygonsIntersectCartesian([[[(2., 2.), (2., 3.), (3., 3.), (3., 2.)]]], [[[(1., 1.), (1., 4.), (4., 4.), (4., 1.), (1., 1.)]]])

1

입력 매개변수​

두 개의 다각형

반환 값​

UInt8, 거짓이면 0, 참이면 1

polygonsIntersectSpherical​

두 다각형이 서로 겹치거나(공통 영역을 가지거나 경계를 공유하는 경우) true를 반환합니다. 자세한 내용은 https://www.boost.org/doc/libs/1_62_0/libs/geometry/doc/html/geometry/reference/algorithms/intersects.html 를 참고하십시오.

예시​

SELECT polygonsIntersectSpherical([[[(4.3613577, 50.8651821), (4.349556, 50.8535879), (4.3602419, 50.8435626), (4.3830299, 50.8428851), (4.3904543, 50.8564867), (4.3613148, 50.8651279)]]], [[[(4.346693, 50.858306), (4.367945, 50.852455), (4.366227, 50.840809), (4.344961, 50.833264), (4.338074, 50.848677), (4.346693, 50.858306)]]]);

1

입력 매개변수​

두 개의 다각형

반환 값​

UInt8, 거짓이면 0, 참이면 1

polygonConvexHullCartesian​

볼록 껍질(convex hull)을 계산합니다. 참고

좌표는 데카르트 좌표계를 사용합니다.

예시​

SELECT wkt(polygonConvexHullCartesian([[[(0., 0.), (0., 5.), (5., 5.), (5., 0.), (2., 3.)]]]))

POLYGON((0 0,0 5,5 5,5 0,0 0))

입력 매개변수​

MultiPolygon

반환 값​

Polygon

polygonAreaSpherical​

다각형이 차지하는 구면상의 면적을 계산합니다.

예시​

SELECT round(polygonAreaSpherical([[[(4.346693, 50.858306), (4.367945, 50.852455), (4.366227, 50.840809), (4.344961, 50.833264), (4.338074, 50.848677), (4.346693, 50.858306)]]]), 14)

9.387704e-8

입력 매개변수​

Polygon

반환 값​

Float

polygonsUnionSpherical​

합집합 연산(OR)을 수행합니다.

예시​

SELECT wkt(polygonsUnionSpherical([[[(4.3613577, 50.8651821), (4.349556, 50.8535879), (4.3602419, 50.8435626), (4.3830299, 50.8428851), (4.3904543, 50.8564867), (4.3613148, 50.8651279)]]], [[[(4.346693, 50.858306), (4.367945, 50.852455), (4.366227, 50.840809), (4.344961, 50.833264), (4.338074, 50.848677), (4.346693, 50.858306)]]]))

MULTIPOLYGON(((4.36661 50.8434,4.36623 50.8408,4.34496 50.8333,4.33807 50.8487,4.34669 50.8583,4.35268 50.8567,4.36136 50.8652,4.36131 50.8651,4.39045 50.8565,4.38303 50.8429,4.36661 50.8434)))

입력 파라미터​

Polygons

반환 값​

MultiPolygon

polygonPerimeterSpherical​

다각형의 둘레 길이를 계산합니다.

예시​

짐바브웨를 나타내는 다각형​

다음은 짐바브웨를 나타내는 다각형입니다:

POLYGON((30.0107 -15.6462,30.0502 -15.6401,30.09 -15.6294,30.1301 -15.6237,30.1699 -15.6322,30.1956 -15.6491,30.2072 -15.6532,30.2231 -15.6497,30.231 -15.6447,30.2461 -15.6321,30.2549 -15.6289,30.2801 -15.6323,30.2962 -15.639,30.3281 -15.6524,30.3567 -15.6515,30.3963 -15.636,30.3977 -15.7168,30.3993 -15.812,30.4013 -15.9317,30.4026 -16.0012,30.5148 -16.0004,30.5866 -16,30.7497 -15.9989,30.8574 -15.9981,30.9019 -16.0071,30.9422 -16.0345,30.9583 -16.0511,30.9731 -16.062,30.9898 -16.0643,31.012 -16.0549,31.0237 -16.0452,31.0422 -16.0249,31.0569 -16.0176,31.0654 -16.0196,31.0733 -16.0255,31.0809 -16.0259,31.089 -16.0119,31.1141 -15.9969,31.1585 -16.0002,31.26 -16.0235,31.2789 -16.0303,31.2953 -16.0417,31.3096 -16.059,31.3284 -16.0928,31.3409 -16.1067,31.3603 -16.1169,31.3703 -16.1237,31.3746 -16.1329,31.3778 -16.1422,31.384 -16.1488,31.3877 -16.1496,31.3956 -16.1477,31.3996 -16.1473,31.4043 -16.1499,31.4041 -16.1545,31.4027 -16.1594,31.4046 -16.1623,31.4241 -16.1647,31.4457 -16.165,31.4657 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polygonPerimeterSpherical FUNCTION 사용 방법​

SELECT round(polygonPerimeterSpherical([(30.010654, -15.646227), (30.050238, -15.640129), (30.090029, -15.629381), (30.130129, -15.623696), (30.16992, -15.632171), (30.195552, -15.649121), (30.207231, -15.653152), (30.223147, -15.649741), (30.231002, -15.644677), (30.246091, -15.632068), (30.254876, -15.628864), (30.280094, -15.632275), (30.296196, -15.639042), (30.32805, -15.652428), (30.356679, -15.651498), (30.396263, -15.635995), (30.39771, -15.716817), (30.39926, -15.812005), (30.401327, -15.931688), (30.402568, -16.001244), (30.514809, -16.000418), (30.586587, -16.000004), (30.74973, -15.998867), (30.857424, -15.998144), (30.901865, -16.007136), (30.942173, -16.034524), (30.958296, -16.05106), (30.973075, -16.062016), (30.989767, -16.06429), (31.012039, -16.054885), (31.023718, -16.045169), (31.042218, -16.024912), (31.056895, -16.017574), (31.065421, -16.019641), (31.073328, -16.025532), (31.080872, -16.025946), (31.089037, -16.01189), (31.1141, -15.996904), (31.15849, 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0.45539

입력 매개변수​

반환값​

polygonsIntersectionCartesian​

다각형의 교차 영역을 계산합니다.

예시​

SELECT wkt(polygonsIntersectionCartesian([[[(0., 0.), (0., 3.), (1., 2.9), (2., 2.6), (2.6, 2.), (2.9, 1.), (3., 0.), (0., 0.)]]], [[[(1., 1.), (1., 4.), (4., 4.), (4., 1.), (1., 1.)]]]))

MULTIPOLYGON(((1 2.9,2 2.6,2.6 2,2.9 1,1 1,1 2.9)))

입력 매개변수​

Polygons

반환값​

MultiPolygon

polygonAreaCartesian​

다각형의 면적을 계산합니다.

예제​

SELECT polygonAreaCartesian([[[(0., 0.), (0., 5.), (5., 5.), (5., 0.)]]])

25

입력 파라미터​

Polygon

반환 값​

Float64

polygonPerimeterCartesian​

다각형의 둘레 길이를 계산합니다.

예시​

SELECT polygonPerimeterCartesian([[[(0., 0.), (0., 5.), (5., 5.), (5., 0.)]]])

15

입력 매개변수​

Polygon

반환값​

Float64

polygonsUnionCartesian​

다각형들의 합집합을 계산합니다.

예시​

SELECT wkt(polygonsUnionCartesian([[[(0., 0.), (0., 3.), (1., 2.9), (2., 2.6), (2.6, 2.), (2.9, 1), (3., 0.), (0., 0.)]]], [[[(1., 1.), (1., 4.), (4., 4.), (4., 1.), (1., 1.)]]]))

MULTIPOLYGON(((1 2.9,1 4,4 4,4 1,2.9 1,3 0,0 0,0 3,1 2.9)))

입력 매개변수​

다각형(Polygons)

반환 값​

다중다각형(MultiPolygon)

기하(geometry) 시스템에 대한 자세한 내용은 ClickHouse에서 사용하는 Boost 라이브러리에 관한 이 발표를 참고하십시오.