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Centos guide PostGIS Manual This method implements the OpenGIS Simple Features Implementation Speci ?cation for SQL s This method implements the SQL MM speci ?cation SQL-MM This function supports d and will not drop the z-index Examples --Get estimate of

PostGIS Manual This method implements the OpenGIS Simple Features Implementation Speci ?cation for SQL s This method implements the SQL MM speci ?cation SQL-MM This function supports d and will not drop the z-index Examples --Get estimate of infected area based on point observations SELECT d diseasetype STConvexHull STCollect d thegeom As thegeom FROM diseaseobs As d GROUP BY d disease type Convex Hull of a MultiLinestring and a MultiPoint seen together with the MultiLinestring and MultiPoint SELECT STAsText STConvexHull STCollect STGeomFromText ? MULTILINESTRING ? STGeomFromText ? MULTIPOINT ? ---stastext-POLYGON See Also STCollect STMinimumBoundingCircle STCurveToLine Name STCurveToLine ?? Converts a CIRCULARSTRING CURVEDPOLYGON to a LINESTRING POLYGON CPostGIS Manual Synopsis geometry STCurveToLine geometry curveGeom geometry STCurveToLine geometry curveGeom integer segmentsperqtrcircle Description Converst a CIRCULAR STRING to regular LINESTRING or CURVEPOLYGON to POLYGON Useful for outputting to devices that can ? t support CIRCULARSTRING geometry types Converts a given geometry to a linear geometry Each curved geometry or segment is converted into a linear approximation using the default value of segments per quarter circle Availability This method implements the OpenGIS Simple Features Implementation Speci ?cation for SQL This method implements the SQL MM speci ?cation SQL-MM This function supports d and will not drop the z-index This method supports Circular Strings and Curves Examples SELECT STAsText STCurveToLine STGeomFromText ? CIRCULARSTRING ? --Result -LINESTRING C