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Data Lake Analytics的Geospatial分析函數怎么理解,相信很多沒有經驗的人對此束手無策,為此本文總結了問題出現的原因和解決方法,通過這篇文章希望你能解決這個問題。
為滿足部分客戶在云上做Geometry數據的分析需求,阿里云Data Lake Analytics(以下簡稱:DLA)支持多種格式的地理空間數據處理函數,符合Open Geospatial Consortium’s (OGC) OpenGIS規范,支持的常用數據格式包括:
WKT
WKB
GeoJson
ESRI Geometry Object Json
ESRI Shape
DLA采用4326坐標系標準,EPSG 4326使用經緯度坐標,屬于地理坐標系。GPS采用的就是這個坐標系。
詳細描述:
https://en.wikipedia.org/wiki/Well-known_text
http://www.opengeospatial.org/standards/wkt-crs
支持類似如下的WKT相關字符串。
POINT (0 0)
LINESTRING (0 0, 1 1, 1 2)
POLYGON ((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1))
MULTIPOINT (0 0, 1 2)
MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))
MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))
GEOMETRYCOLLECTION (POINT (2 3), LINESTRING (2 3, 3 4))
詳細描述:https://en.wikipedia.org/wiki/Well-known_text#Well-known_binary
上述WKT數據和WKB的對應示例:
WKT | WKB |
---|---|
POINT (0 0) | 010100000000000000000000000000000000000000 |
LINESTRING (0 0, 1 1, 1 2) | 01020000000300000000000000000000000000000000000000000000000000F03F000000000000F03F000000000000F03F0000000000000040 |
POLYGON ((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)) | 01030000000200000005000000000000000000000000000000000000000000000000001040000000000000000000000000000010400000000000001040000000000000000000000000000010400000000000000000000000000000000005000000000000000000F03F000000000000F03F000000000000F03F0000000000000040000000000000004000000000000000400000000000000040000000000000F03F000000000000F03F000000000000F03F |
MULTIPOINT (0 0, 1 2) | 0104000000020000000101000000000000000000000000000000000000000101000000000000000000F03F0000000000000040 |
MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4)) | 01050000000200000001020000000300000000000000000000000000000000000000000000000000F03F000000000000F03F000000000000F03F0000000000000040010200000003000000000000000000004000000000000008400000000000000840000000000000004000000000000014400000000000001040 |
MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1))) |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|
GEOMETRYCOLLECTION (POINT (2 3), LINESTRING (2 3, 3 4)) | 0107000000020000000101000000000000000000004000000000000008400102000000020000000000000000000040000000000000084000000000000008400000000000001040 |
GeoJson的詳細描述:http://geojson.org/
規范說明:http://resources.esri.com/help/9.3/arcgisserver/apis/REST/geometry.html
規范說明:http://www.esri.com/LIBRARY/WHITEPAPERS/PDFS/SHAPEFILE.PDF
Name | Description |
---|---|
ST_asText | 將Geometry數據轉成WKT格式的字符串數據。 |
ST_LineFromText | 輸入WKT格式的Line字符串數據,生成Line的Geometry數據。 |
ST_Point | 從坐標系的坐標值(X, Y),生成對應的Point的Geometry數據。 |
ST_Polygon | 輸入WKT格式的Polygon字符串數據,生成Polygon的Geometry數據。 |
ST_Area | 返回面或多面的面積。對于點、線,返回0.0。對于GeometryCollection,返回所有單個面積的和。 |
ST_GeometryFromText | 輸入WKT格式的字符串數據,生成Geometry數據。 |
ST_Buffer | 獲取幾何對象和距離,然后返回表示圍繞源對象的緩沖區的幾何對象。 |
ST_Centroid | 獲取幾何對象的中心點。 |
ST_CoordDim | 返回幾何對象的坐標值維度。 |
ST_Dimension | 用于返回幾何對象的維度。在這種情況下,維度是指長度和寬度。例如,點既沒有長度也沒有寬度,所以其維度為 0;而線只有長度卻沒有寬度,因此其維度為 1。 |
ST_IsClosed | 判斷Line或者MultiLine是否閉合。 |
ST_IsEmpty | 判斷幾何對象是否為空。 |
ST_Length | 計算Line或者MultiLine的長度。 |
ST_XMax | 返回幾何對象在坐標系中的最大X坐標值。 |
ST_XMin | 返回幾何對象在坐標系中的最小X坐標值。 |
ST_YMax | 返回幾何對象在坐標系中的最大Y坐標值。 |
ST_YMin | 返回幾何對象在坐標系中的最小Y坐標值。 |
ST_NumInteriorRing | 以Polygon作為輸入參數,并返回其內部環數。 |
ST_NumPoints | 用于返回幾何對象中的點(折點)數。 |
ST_IsRing | 以Line作為輸入參數,判斷是否是環(如Line是閉合的)。 |
ST_StartPoint | 用于返回Line的第一個點。 |
ST_EndPoint | 用于返回Line的最后一個點。 |
ST_X | 返回Point的X坐標。 |
ST_Y | 返回Point的Y坐標。 |
ST_Boundary | 輸入一個幾何對象,然后以幾何對象形式返回其組合邊界。 |
ST_Envelope | 以多邊形的形式返回幾何對象的最小邊界框。 |
ST_Difference | 輸入兩個幾何對象,然后返回表示兩個源對象之差的幾何對象。 |
ST_Distance | 用于返回兩個幾何對象之間的距離。這一距離是兩個幾何對象的最近折點之間的距離。 |
ST_ExteriorRing | 以Line形式返回面的外部環。 |
ST_Intersection | 以兩個幾何對象作為輸入參數,然后以二維幾何對象的形式返回交集。 |
ST_SymDifference | 返回表示兩個幾何對象間的點集對稱差異的幾何值對象。 |
ST_Contains | 輸入兩個幾何對象,判斷第一個對象是否完全包含第二個對象。 |
ST_Crosses | 以兩個幾何對象作為輸入,如果這兩個對象的交集生成的幾何對象的維度小于兩個源對象中的最大維度,則返回 1。交集對象所包含的點必須在兩個源幾何的內部,并且不等于其中任何一個源對象。否則,返回 0。 |
ST_Disjoint | 輸入兩個幾何對象,判斷兩個幾何對象的交集是否為空集。 |
ST_Equals | 判斷兩個幾何對象是否完全相同。 |
ST_Intersects | 判斷兩個幾何對象的交集是否不生成空集。 |
ST_Overlaps | 判斷兩個幾何對象的交集生成的幾何對象是否維度相同但不等于任一源對象。 |
ST_Relate | 比較兩個幾何對象,判斷是否滿足“DE-9IM”模式(https://en.wikipedia.org/wiki/DE-9IM)矩陣字符串指定的條件。 |
ST_Touches | 判斷兩個幾何對象的公共點是否都不與兩個幾何對象的內部相交。 |
ST_Within | 判斷第一個幾何對象是否完全位于第二個幾何對象的范圍內。 |
ST_asBinary | 輸入一個幾何對象,然后返回其可識別的二進制WKB數據。 |
ST_GeometryFromWKBHexString | 輸入WKB的HEX字符串數據,返回對應的幾何對象。 |
ST_pointFromWKBHexString | 輸入Point的WKB的HEX字符串數據,返回對應的Point幾何對象。 |
ST_lineFromWKBHexString | 輸入Line的WKB的HEX字符串數據,返回對應的Line幾何對象。 |
ST_polyFromWKBHexString | 輸入Polygon的WKB的HEX字符串數據,返回對應的Polygon幾何對象。 |
ST_MPointFromWKBHexString | 輸入MultiPoint的WKB的HEX字符串數據,返回對應的MultiPoint幾何對象。 |
ST_MLineFromWKBHexString | 輸入MultiLine的WKB的HEX字符串數據,返回對應的MultiLine幾何對象。 |
ST_MPolyFromWKBHexString | 輸入MultiPolygon的WKB的HEX字符串數據,返回對應的MultiPolygon幾何對象。 |
ST_GeometryFromWKB | 輸入WKB數據,返回對應的幾何對象。 |
ST_pointFromWKB | 輸入Point的WKB數據,返回對應的Point幾何對象。 |
ST_lineFromWKB | 輸入Line的WKB數據,返回對應的Line幾何對象。 |
ST_polyFromWKB | 輸入Polygon的WKB數據,返回對應的Polygon幾何對象。 |
ST_MPointFromWKB | 輸入MultiPoint的WKB數據,返回對應的MultiPoint幾何對象。 |
ST_MLineFromWKB | 輸入MultiLine的WKB數據,返回對應的MultiLine幾何對象。 |
ST_MPolyFromWKB | 輸入MultiPolygon的WKB數據,返回對應的MultiPolygon幾何對象。 |
ST_GeometryFromGeoJson | 輸入GeoJson的字符串數據,返回對應的幾何對象。 |
ST_GeometryFromJson | 輸入ESRI Geometry Object Json的字符串數據,返回對應的幾何對象。 |
ST_asGeoJson | 把幾何對象轉成GeoJson格式輸出。 |
ST_asJson | 把幾何對象轉成ESRI Geometry Object Json格式輸出。 |
ST_GeometryFromEsriShape | 輸入ESRI Shape的二進制數據,返回對應的幾何對象。 |
UDF_SYS_GEO_IN_CYCLE | 僅適用于北半球:做基于地理位置的經緯度畫圈 |
UDF_SYS_GEO_IN_RECTANGLE | 僅適用于北半球:用于做基于地理位置的經緯度畫矩形 |
UDF_SYS_GEO_DISTANCE | 僅適用于北半球:用作一個經緯度列和一個固定的坐標點的距離計算 |
ST_asText
ST_asText(GEOMETRY) -> VARCHAR
將Geometry數據轉成WKT格式的字符串數據。
示例:
select ST_asText(ST_LineFromText('LINESTRING (0 0, 1 1, 1 2)')); +----------------------------+ | _col0 | +----------------------------+ | LINESTRING (0 0, 1 1, 1 2) | +----------------------------+
ST_LineFromText
ST_LineFromText(VARCHAR) -> GEOMETRY
輸入WKT格式的Line字符串數據,生成Line的Geometry數據。
示例:
select ST_asText(ST_LineFromText('LINESTRING (0 0, 1 1, 1 2)')); +----------------------------+ | _col0 | +----------------------------+ | LINESTRING (0 0, 1 1, 1 2) | +----------------------------+
ST_Point
ST_Point(DOUBLE, DOUBLE) -> GEOMETRY
從坐標系的坐標值(X, Y),生成對應的Point的Geometry數據。
示例:
select ST_asText(ST_Point(30.2741500000,120.1551500000)); +----------------------------+ | _col0 | +----------------------------+ | POINT (30.27415 120.15515) | +----------------------------+
ST_Polygon
ST_Polygon(VARCHAR) -> GEOMETRY
輸入WKT格式的Polygon字符串數據,生成Polygon的Geometry數據。
示例:
select ST_asText(ST_Polygon('POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))')); +----------------------------------------------------------------+ | _col0 | +----------------------------------------------------------------+ | POLYGON ((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 1 2, 2 2, 2 1, 1 1)) | +----------------------------------------------------------------+
ST_Area
ST_Area(Geometry) -> DOUBLE
返回面或多面的面積。對于點、線,返回0.0。對于GeometryCollection,返回所有單個面積的和。
示例:
select ST_Area(ST_Polygon('POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))')); +-------+ | _col0 | +-------+ | 15.0 | +-------+ select ST_Area(ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 16.0 | +-------+
ST_GeometryFromText
ST_GeometryFromText(VARCHAR) -> GEOMETRY
輸入WKT格式的字符串數據,生成Geometry數據。
ST_Buffer
ST_Buffer(GEOMETRY, DOUBLE) -> GEOMETRY
獲取幾何對象和距離,然后返回表示圍繞源對象的緩沖區的幾何對象。
ST_Centroid
ST_Centroid(GEOMETRY) -> GEOMETRY
獲取幾何對象的中心點。
示例:
select ST_asText(ST_Centroid(ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'))); +-----------------------+ | _col0 | +-----------------------+ | POINT (1.8125 1.8125) | +-----------------------+ select ST_asText(ST_Centroid(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2)'))); +---------------+ | _col0 | +---------------+ | POINT (0.5 1) | +---------------+ select ST_asText(ST_Centroid(ST_GeometryFromText('POINT (0.5 1)'))); +---------------+ | _col0 | +---------------+ | POINT (0.5 1) | +---------------+ select ST_asText(ST_Centroid(ST_GeometryFromText('POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))'))); +---------------------------------------------+ | _col0 | +---------------------------------------------+ | POINT (2.033333333333333 2.033333333333333) | +---------------------------------------------+
ST_CoordDim
ST_CoordDim(GEOMETRY) -> BIGINT
返回幾何對象的坐標值維度。
示例:
select ST_CoordDim(ST_GeometryFromText('POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))')); +-------+ | _col0 | +-------+ | 2 | +-------+ select ST_CoordDim(ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 2 | +-------+ select st_coorddim(st_geometryfromtext('point Z (60.567222 -140.404 5959)')); +-------+ | _col0 | +-------+ | 3 | +-------+ select st_coorddim(st_geometryfromtext('point M (60.567222 -140.404 5250)')); +-------+ | _col0 | +-------+ | 3 | +-------+ select st_coorddim(st_geometryfromtext('point ZM (60.567222 -140.404 5959 5250)')); +-------+ | _col0 | +-------+ | 4 | +-------+
ST_Dimension
ST_Dimension(GEOMETRY) -> BIGINT
用于返回幾何對象的維度。在這種情況下,維度是指長度和寬度。例如,點既沒有長度也沒有寬度,所以其維度為 0;而線只有長度卻沒有寬度,因此其維度為 1。
示例:
select ST_Dimension(ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 2 | +-------+
ST_IsClosed
ST_IsClosed(GEOMETRY) -> BOOLEAN
判斷Line或者MultiLine是否閉合。
示例:
select ST_IsClosed(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2)')); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_IsClosed(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2, 0 0)')); +-------+ | _col0 | +-------+ | 1 | +-------+ select ST_IsClosed(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-------+ | _col0 | +-------+ | 0 | +-------+
ST_IsEmpty
ST_IsEmpty(GEOMETRY) -> BOOLEAN
判斷幾何對象是否為空。
示例:
select ST_IsEmpty(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2, 0 0)')); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_IsEmpty(null); +-------+ | _col0 | +-------+ | NULL | +-------+ SELECT ST_IsEmpty(ST_GeometryFromText('GEOMETRYCOLLECTION EMPTY')); +-------+ | _col0 | +-------+ | 1 | +-------+ SELECT ST_IsEmpty(ST_GeometryFromText('POLYGON EMPTY')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_Length
ST_Length(GEOMETRY) -> DOUBLE
計算Line或者MultiLine的長度。
示例:
SELECT ST_Length(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2, 0 0)')); +-------------------+ | _col0 | +-------------------+ | 4.650281539872885 | +-------------------+ SELECT ST_Length(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-------------------+ | _col0 | +-------------------+ | 6.656854249492381 | +-------------------+
ST_XMax
ST_XMax(GEOMETRY) -> DOUBLE
返回幾何對象在坐標系中的最大X坐標值。
示例:
SELECT ST_XMax(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-------+ | _col0 | +-------+ | 5.0 | +-------+ SELECT ST_XMax(ST_GeometryFromText('POINT (0.5 1)')); +-------+ | _col0 | +-------+ | 0.5 | +-------+
ST_XMin
ST_XMin(GEOMETRY) -> DOUBLE
返回幾何對象在坐標系中的最小X坐標值。
示例:
SELECT ST_XMin(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-------+ | _col0 | +-------+ | 0.0 | +-------+ SELECT ST_XMin(ST_GeometryFromText('POINT (0.5 1)')); +-------+ | _col0 | +-------+ | 0.5 | +-------+
ST_YMax
ST_YMax(GEOMETRY) -> DOUBLE
返回幾何對象在坐標系中的最大Y坐標值。
示例:
SELECT ST_YMax(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-------+ | _col0 | +-------+ | 4.0 | +-------+ SELECT ST_YMax(ST_GeometryFromText('POINT (0.5 1)')); +-------+ | _col0 | +-------+ | 1.0 | +-------+
ST_YMin
ST_YMin(GEOMETRY) -> DOUBLE
返回幾何對象在坐標系中的最小Y坐標值。
示例:
SELECT ST_YMin(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-------+ | _col0 | +-------+ | 0.0 | +-------+ SELECT ST_YMin(ST_GeometryFromText('POINT (0.5 1)')); +-------+ | _col0 | +-------+ | 1.0 | +-------+
ST_NumInteriorRing
ST_NumInteriorRing(GEOMETRY) -> BIGINT
以Polygon作為輸入參數,并返回其內部環數。
示例:
SELECT ST_NumInteriorRing(ST_GeometryFromText('POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_NumPoints
ST_NumPoints(GEOMETRY) -> BIGINT
用于返回幾何對象中的點(折點)數。
示例:
SELECT ST_NumPoints(ST_GeometryFromText('POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))')); +-------+ | _col0 | +-------+ | 8 | +-------+ SELECT ST_NumPoints(ST_GeometryFromText('POLYGON EMPTY')); +-------+ | _col0 | +-------+ | 0 | +-------+ SELECT ST_NumPoints(ST_GeometryFromText('POINT (0.5 1)')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_IsRing
ST_IsRing(GEOMETRY) -> BOOLEAN
以Line作為輸入參數,判斷是否是環(如Line是閉合的)。
示例:
select ST_IsRing(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2)')); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_IsRing(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2, 0 0)')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_StartPoint
ST_StartPoint(GEOMETRY) -> GEOMETRY
用于返回Line的第一個點。
示例:
select ST_asText(ST_StartPoint(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2, 0 0)'))); +-------------+ | _col0 | +-------------+ | POINT (0 0) | +-------------+
ST_EndPoint
ST_EndPoint(GEOMETRY) -> GEOMETRY
用于返回Line的最后一個點。
示例:
select ST_asText(ST_EndPoint(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2)'))); +-------------+ | _col0 | +-------------+ | POINT (1 2) | +-------------+
ST_X
ST_X(GEOMETRY) -> DOUBLE
返回Point的X坐標。
示例:
select ST_X(ST_GeometryFromText('POINT (0.5 1)')); +-------+ | _col0 | +-------+ | 0.5 | +-------+
ST_Y
ST_Y(GEOMETRY) -> DOUBLE
返回Point的Y坐標。
示例:
select ST_Y(ST_GeometryFromText('POINT (0.5 1)')); +-------+ | _col0 | +-------+ | 1.0 | +-------+
ST_Boundary
ST_Boundary(GEOMETRY) -> GEOMETRY
輸入一個幾何對象,然后以幾何對象形式返回其組合邊界。
示例:
select ST_asText(ST_Boundary(ST_GeometryFromText('POINT (0.5 1)'))); +-------------+ | _col0 | +-------------+ | POINT EMPTY | +-------------+ select ST_asText(ST_Boundary(ST_GeometryFromText('LINESTRING (0 0, 1 1, 1 2)'))); +---------------------------+ | _col0 | +---------------------------+ | MULTIPOINT ((0 0), (1 2)) | +---------------------------+ select ST_asText(ST_Boundary(ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'))); +-------------------------------------------------------------------------------------------------------------+ | _col0 | +-------------------------------------------------------------------------------------------------------------+ | MULTILINESTRING ((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 1 2, 2 2, 2 1, 1 1), (-1 -1, -2 -1, -2 -2, -1 -2, -1 -1)) | +-------------------------------------------------------------------------------------------------------------+
ST_Envelope
ST_Envelope(GEOMETRY) -> GEOMETRY
以多邊形的形式返回幾何對象的最小邊界框。
示例:
select ST_asText(ST_Envelope(ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'))); +-------------------------------------------+ | _col0 | +-------------------------------------------+ | POLYGON ((-2 -2, 4 -2, 4 4, -2 4, -2 -2)) | +-------------------------------------------+
ST_Difference
ST_Difference(GEOMETRY, GEOMETRY) -> GEOMETRY
輸入兩個幾何對象,然后返回表示兩個源對象之差的幾何對象。
示例:
select ST_asText(ST_Difference( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTILINESTRING ((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 1 2, 2 2, 2 1, 1 1), (-1 -1, -2 -1, -2 -2, -1 -2, -1 -1))'))); +--------------------------------------------------------------------------------------------------------------+ | _col0 | +--------------------------------------------------------------------------------------------------------------+ | MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 1 2, 2 2, 2 1, 1 1)), ((-1 -1, -2 -1, -2 -2, -1 -2, -1 -1))) | +--------------------------------------------------------------------------------------------------------------+ select ST_asText(ST_Difference( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'))); +--------------------+ | _col0 | +--------------------+ | MULTIPOLYGON EMPTY | +--------------------+
ST_Distance
ST_Distance(GEOMETRY, GEOMETRY) -> DOUBLE
用于返回兩個幾何對象之間的距離。這一距離是兩個幾何對象的最近折點之間的距離。
示例:
select ST_Distance( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 0.0 | +-------+ select ST_Distance( ST_GeometryFromText('POINT(0 0)'), ST_GeometryFromText('POINT(1 1)')); +--------------------+ | _col0 | +--------------------+ | 1.4142135623730951 | +--------------------+
ST_ExteriorRing
ST_ExteriorRing(GEOMETRY) -> GEOMETRY
以Line形式返回面的外部環。
示例:
select ST_asText(ST_ExteriorRing(ST_GeometryFromText('POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))'))); +--------------------------------------+ | _col0 | +--------------------------------------+ | LINESTRING (0 0, 4 0, 4 4, 0 4, 0 0) | +--------------------------------------+
ST_Intersection
ST_Intersection(GEOMETRY, GEOMETRY) -> GEOMETRY
以兩個幾何對象作為輸入參數,然后以二維幾何對象的形式返回交集。
示例:
select ST_asText(ST_Intersection( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'))); +--------------------------------------------------------------------------------------------------------------+ | _col0 | +--------------------------------------------------------------------------------------------------------------+ | MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 1 2, 2 2, 2 1, 1 1)), ((-1 -1, -2 -1, -2 -2, -1 -2, -1 -1))) | +--------------------------------------------------------------------------------------------------------------+ select ST_asText(ST_Intersection( ST_GeometryFromText('POINT(0 0)'), ST_GeometryFromText('POINT(1 1)'))); +--------------------+ | _col0 | +--------------------+ | MULTIPOLYGON EMPTY | +--------------------+
ST_SymDifference
ST_SymDifference(GEOMETRY, GEOMETRY) -> GEOMETRY
返回表示兩個幾何對象間的點集對稱差異的幾何值對象。
示例:
select ST_asText(ST_SymDifference( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'))); +--------------------+ | _col0 | +--------------------+ | MULTIPOLYGON EMPTY | +--------------------+ select ST_asText(ST_SymDifference( ST_GeometryFromText('POINT(0 0)'), ST_GeometryFromText('POINT(1 1)'))); +---------------------------+ | _col0 | +---------------------------+ | MULTIPOINT ((0 0), (1 1)) | +---------------------------+
下圖的陰影部分顯示了對稱差異的結果。對稱差異為包括兩個表面的多表面圖形:其中一個表面包含位于正方形之內、圓形之外的所有點,另外一個表面包含位于圓形之內、正方形之外的所有點。
ST_Contains
ST_Contains(GEOMETRY, GEOMETRY) -> BOOLEAN
輸入兩個幾何對象,判斷第一個對象是否完全包含第二個對象。
示例:
select ST_Contains( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 1 | +-------+ select ST_Contains( ST_GeometryFromText('POINT(0 0)'), ST_GeometryFromText('POINT(1 1)')); +-------+ | _col0 | +-------+ | 0 | +-------+
ST_Crosses
ST_Crosses(GEOMETRY, GEOMETRY) -> BOOLEAN
以兩個幾何對象作為輸入,如果這兩個對象的交集生成的幾何對象的維度小于兩個源對象中的最大維度,則返回 1。交集對象所包含的點必須在兩個源幾何的內部,并且不等于其中任何一個源對象。否則,返回 0。
示例:
select ST_Crosses( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_Crosses( ST_GeometryFromText('LINESTRING(0 0, 2 2)'), ST_GeometryFromText('LINESTRING(0 2, 2 0)')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_Disjoint
ST_Disjoint(GEOMETRY, GEOMETRY) -> BOOLEAN
輸入兩個幾何對象,判斷兩個幾何對象的交集是否為空集。
示例:
select ST_Disjoint( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_Disjoint( ST_GeometryFromText('LINESTRING(0 0, 2 2)'), ST_GeometryFromText('LINESTRING(0 2, 2 4)')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_Equals
ST_Equals(GEOMETRY, GEOMETRY) -> BOOLEAN
判斷兩個幾何對象是否完全相同。
示例:
select ST_Equals( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 1 | +-------+ select ST_Equals( ST_GeometryFromText('LINESTRING(0 0, 2 2)'), ST_GeometryFromText('LINESTRING(0 2, 2 4)')); +-------+ | _col0 | +-------+ | 0 | +-------+
ST_Intersects
ST_Intersects(GEOMETRY, GEOMETRY) -> BOOLEAN
判斷兩個幾何對象的交集是否不生成空集。
示例:
select ST_Intersects( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 1 | +-------+ select ST_Intersects( ST_GeometryFromText('LINESTRING(0 0, 2 2)'), ST_GeometryFromText('LINESTRING(0 2, 2 4)')); +-------+ | _col0 | +-------+ | 0 | +-------+
ST_Overlaps
ST_Overlaps(GEOMETRY, GEOMETRY) -> BOOLEAN
判斷兩個幾何對象的交集生成的幾何對象是否維度相同但不等于任一源對象。
示例:
select ST_Overlaps( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_Overlaps( ST_GeometryFromText('LINESTRING(1 1, 2 2)'), ST_GeometryFromText('LINESTRING(0 0, 1.5 1.5)')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_Relate
ST_Relate(GEOMETRY, GEOMETRY, VARCHAR) -> BOOLEAN
比較兩個幾何對象,判斷是否滿足“DE-9IM”模式(https://en.wikipedia.org/wiki/DE-9IM)矩陣字符串指定的條件。
示例:
select ST_Relate( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), '102101FF2'); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_Relate( ST_GeometryFromText('LINESTRING(1 1, 2 2)'), ST_GeometryFromText('LINESTRING(0 0, 1.5 1.5)'), '1*1***1**'); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_Touches
ST_Touches(GEOMETRY, GEOMETRY) -> BOOLEAN
判斷兩個幾何對象的公共點是否都不與兩個幾何對象的內部相交。
示例:
select ST_Touches( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 0 | +-------+ select ST_Touches( ST_GeometryFromText('LINESTRING(1 1, 2 2)'), ST_GeometryFromText('LINESTRING(0 0, 1 1)')); +-------+ | _col0 | +-------+ | 1 | +-------+
ST_Within
ST_Within(GEOMETRY, GEOMETRY) -> BOOLEAN
判斷第一個幾何對象是否完全位于第二個幾何對象的范圍內。
示例:
select ST_Within( ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))'), ST_GeometryFromText('MULTIPOLYGON (((0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1)), ((-1 -1, -1 -2, -2 -2, -2 -1, -1 -1)))')); +-------+ | _col0 | +-------+ | 1 | +-------+ select ST_Within( ST_GeometryFromText('LINESTRING(1 1, 2 2)'), ST_GeometryFromText('LINESTRING(0 0, 1 1)')); +-------+ | _col0 | +-------+ | 0 | +-------+
ST_asBinary
ST_asBinary(GEOMETRY) -> VARBINARY
輸入一個幾何對象,然后返回其可識別的二進制WKB數據。
ST_GeometryFromWKBHexString
ST_GeometryFromWKBHexString(VARCHAR) -> GEOMETRY
輸入WKB的HEX字符串數據,返回對應的幾何對象。
示例:
select ST_ASTEXT(ST_GeometryFromWKBHexString('000000000140000000000000004010000000000000')); +-------------+ | _col0 | +-------------+ | POINT (2 4) | +-------------+
ST_pointFromWKBHexString
ST_pointFromWKBHexString(VARCHAR) -> GEOMETRY
輸入Point的WKB的HEX字符串數據,返回對應的Point幾何對象。
示例:
select ST_ASTEXT(ST_pointFromWKBHexString('000000000140000000000000004010000000000000')); +-------------+ | _col0 | +-------------+ | POINT (2 4) | +-------------+
ST_lineFromWKBHexString
ST_lineFromWKBHexString(VARCHAR) -> GEOMETRY
輸入Line的WKB的HEX字符串數據,返回對應的Line幾何對象。
ST_polyFromWKBHexString
ST_polyFromWKBHexString(VARCHAR) -> GEOMETRY
輸入Polygon的WKB的HEX字符串數據,返回對應的Polygon幾何對象。
ST_MPointFromWKBHexString
ST_MPointFromWKBHexString(VARCHAR) -> GEOMETRY
輸入MultiPoint的WKB的HEX字符串數據,返回對應的MultiPoint幾何對象。
示例:
SELECT ST_asText(ST_MPointFromWKBHexString('0104000000020000000101000000000000000000000000000000000000000101000000000000000000F03F0000000000000040')); +---------------------------+ | _col0 | +---------------------------+ | MULTIPOINT ((0 0), (1 2)) | +---------------------------+
ST_MLineFromWKBHexString
ST_MLineFromWKBHexString(VARCHAR) -> GEOMETRY
輸入MultiLine的WKB的HEX字符串數據,返回對應的MultiLine幾何對象。
ST_MPolyFromWKBHexString
ST_MPolyFromWKBHexString(VARCHAR) -> GEOMETRY
輸入MultiPolygon的WKB的HEX字符串數據,返回對應的MultiPolygon幾何對象。
ST_GeometryFromWKB
ST_GeometryFromWKB(VARBINARY) -> GEOMETRY
輸入WKB數據,返回對應的幾何對象。
示例:
select ST_ASTEXT(ST_GeometryFromWKB(from_hex('000000000140000000000000004010000000000000'))); +-------------+ | _col0 | +-------------+ | POINT (2 4) | +-------------+
ST_pointFromWKB
ST_pointFromWKB(VARBINARY) -> GEOMETRY
輸入Point的WKB數據,返回對應的Point幾何對象。
示例:
select ST_ASTEXT(ST_pointFromWKB(from_hex('000000000140000000000000004010000000000000'))); +-------------+ | _col0 | +-------------+ | POINT (2 4) | +-------------+
ST_lineFromWKB
ST_lineFromWKB(VARBINARY) -> GEOMETRY
輸入Line的WKB數據,返回對應的Line幾何對象。
ST_polyFromWKB
ST_polyFromWKB(VARBINARY) -> GEOMETRY
輸入Polygon的WKB數據,返回對應的Polygon幾何對象。
ST_MPointFromWKB
ST_MPointFromWKB(VARBINARY) -> GEOMETRY
輸入MultiPoint的WKB數據,返回對應的MultiPoint幾何對象。
示例:
SELECT ST_asText(ST_MPointFromWKB(from_hex('0104000000020000000101000000000000000000000000000000000000000101000000000000000000F03F0000000000000040'))); +---------------------------+ | _col0 | +---------------------------+ | MULTIPOINT ((0 0), (1 2)) | +---------------------------+
ST_MLineFromWKB
ST_MLineFromWKB(VARBINARY) -> GEOMETRY
輸入MultiLine的WKB數據,返回對應的MultiLine幾何對象。
ST_MPolyFromWKB
ST_MPolyFromWKB(VARBINARY) -> GEOMETRY
輸入MultiPolygon的WKB數據,返回對應的MultiPolygon幾何對象。
ST_GeometryFromGeoJson
ST_GeometryFromGeoJson(VARCHAR) -> GEOMETRY
輸入GeoJson的字符串數據,返回對應的幾何對象。
ST_GeometryFromJson
ST_GeometryFromJson(VARCHAR) -> GEOMETRY
輸入ESRI Geometry Object Json的字符串數據,返回對應的幾何對象。
ST_asGeoJson
ST_asGeoJson(GEOMETRY) -> VARCHAR
把幾何對象轉成GeoJson格式輸出。
示例:
SELECT ST_asGeoJson(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-----------------------------------------------------------------------------------------------+ | _col0 | +-----------------------------------------------------------------------------------------------+ | {"type":"MultiLineString","coordinates":[[[0,0],[1,1],[1,2]],[[2,3],[3,2],[5,4]]],"crs":null} | +-----------------------------------------------------------------------------------------------+
ST_asJson
ST_asJson(GEOMETRY) -> VARCHAR
把幾何對象轉成ESRI Geometry Object Json格式輸出。
示例:
SELECT ST_asJson(ST_GeometryFromText('MULTILINESTRING ((0 0, 1 1, 1 2), (2 3, 3 2, 5 4))')); +-----------------------------------------------------+ | _col0 | +-----------------------------------------------------+ | {"paths":[[[0,0],[1,1],[1,2]],[[2,3],[3,2],[5,4]]]} | +-----------------------------------------------------+
ST_GeometryFromEsriShape
ST_GeometryFromEsriShape(VARBINARY) -> GEOMETRY
輸入ESRI Shape的二進制數據,返回對應的幾何對象。
示例:
SELECT california_counties.name, COUNT(*) cnt FROM california_counties CROSS JOIN earthquakes WHERE ST_CONTAINS (ST_GeometryFromesrishape(california_counties.boundaryshape), ST_POINT(earthquakes.longitude, earthquakes.latitude)) GROUP BY california_counties.name ORDER BY cnt DESC, california_counties.name; +-----------------+------+ | name | cnt | +-----------------+------+ | San Benito | 8 | | San Bernardino | 7 | | Riverside | 6 | | Inyo | 5 | | Imperial | 3 | | San Diego | 2 | | Kern | 1 | | Kings | 1 | | Monterey | 1 | | San Luis Obispo | 1 | | Santa Clara | 1 | | Ventura | 1 | +-----------------+------+
UDF_SYS_GEO_IN_CYCLE
UDF_SYS_GEO_IN_CYCLE(longitude, latitude, point, radius) -> BOOLEAN 第一個參數為經度列名稱, 類型FLOAT/DOUBLE 第二個參數為緯度列名稱, 類型FLOAT/DOUBLE 第三個參數為圓圈中心點的位置,格式=>'經度,維度', =>'120.85979,30.011984' 第四個參數為圓圈的半徑,單位米
判斷longitude、latitude的點是否在以中心點point為圓心,半徑為radius的圓內。
示例:
SELECT count(*) as cnt FROM earthquakes WHERE UDF_SYS_GEO_IN_CYCLE(longitude,latitude, '120.85979,30.011984', 5000000000000) = true; +------+ | cnt | +------+ | 2858 | +------+
UDF_SYS_GEO_IN_RECTANGLE
UDF_SYS_GEO_IN_RECTANGLE(longitude, latitude, pointA, pointB) -> BOOLEAN 第一個參數為經度列名稱, 類型FLOAT/DOUBLE 第二個參數為緯度列名稱, 類型FLOAT/DOUBLE 第三個參數為矩形的左下角坐標,格式=>'經度,維度', =>'120.85979,30.011984' 第四個參數為矩形的右上角坐標,格式=>'經度,維度', =>'120.88450,31.21011'
判斷longitude、latitude的點是否在以2個斜角點構成的矩形內。
示例:
SELECT count(*) as cnt FROM earthquakes WHERE UDF_SYS_GEO_IN_RECTANGLE(longitude, latitude, '69.037,36.5759', '142.018,67.8713')=true; +------+ | cnt | +------+ | 55 | +------+
UDF_SYS_GEO_DISTANCE
UDF_SYS_GEO_DISTANCE(longitude, latitude, pointA) -> INTEGER 第一個參數為經度列名稱, 類型FLOAT/DOUBLE 第二個參數為緯度列名稱, 類型FLOAT/DOUBLE 第三個參數為固定坐標點的經緯度,格式=>'經度,維度', =>'120.85979,30.011984'
求longitude、latitude的點和pointA點的距離,單位:米。
示例:
SELECT count(*) as cnt FROM earthquakes WHERE UDF_SYS_GEO_DISTANCE(longitude, latitude, '69.037,36.5759') > 10000; +------+ | cnt | +------+ | 2857 | +------+
看完上述內容,你們掌握Data Lake Analytics的Geospatial分析函數怎么理解的方法了嗎?如果還想學到更多技能或想了解更多相關內容,歡迎關注億速云行業資訊頻道,感謝各位的閱讀!
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