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gemisigo
Joined: 11 Mar 2010 Posts: 1440


FR: Custom Assistance for Spatial Functions in MySQL 

I've tried to put together some info for Custom Assistance for Geometry and Spatial Functions in MySQL. It is certainly incomplete and might contain error here and there. Could you check them to see if they'd fit (and possibly fix them in case they don't)?


Geometry Functions
GeometryCollection(g1 geometry, g2 geometry, ...)GeometryCollection;Constructs a GeometryCollection.
LineString(pt1 point, pt2 point, ...)LineString;Constructs a LineString value from a number of Point or WKB Point arguments. If the number of arguments is less than two, the return value is NULL.
MultiLineString(ls1 linestring, ls2 linestring, ...)MultiLineString;Constructs a MultiLineString value using LineString or WKB LineString arguments.
MultiPoint(pt1 point, pt2 point, ...)MultiPoint;Constructs a MultiPoint value using Point or WKB Point arguments.
MultiPolygon(poly1, poly2, ...)MultiPolygon;Constructs a MultiPolygon value from a set of Polygon or WKB Polygon arguments.
Point(x, y)Point;Constructs a Point using its coordinates.
Polygon(ls1 linestring, ls2 linestring, ...)Polygon;Constructs a Polygon value from a number of LineString or WKB LineString arguments. If any argument does not represent a LinearRing (that is, not a closed and simple LineString geometry)  the return value is NULL.
Spatial Functions
ST_GeomCollFromText(wkt varchar[, srid integer])GeometryCollection;Constructs a GeometryCollection value using its WKT representation and SRID.
ST_GeometryCollectionFromText(wkt varchar[, srid integer])GeometryCollection;Constructs a GeometryCollection value using its WKT representation and SRID.
ST_GeomCollFromTxt(wkt varchar[, srid integer])GeometryCollection;Constructs a GeometryCollection value using its WKT representation and SRID.
ST_GeomFromText(wkt varchar[, srid integer])geometry;Constructs a geometry value of any type using its WKT representation and SRID
ST_GeometryFromText(wkt varchar[, srid integer])geometry;Constructs a geometry value of any type using its WKT representation and SRID.
ST_LineFromText(wkt varchar[, srid integer])LineString;Constructs a LineString value using its WKT representation and SRID.
ST_LineStringFromText(wkt varchar[, srid integer])LineString;Constructs a LineString value using its WKT representation and SRID.
ST_MLineFromText(wkt varchar[, srid integer])MultiLineString;Constructs a MultiLineString value using its WKT representation and SRID.
ST_MultiLineStringFromText(wkt varchar[, srid integer])MultiLineString;Constructs a MultiLineString value using its WKT representation and SRID.
ST_MPointFromText(wkt varchar[, srid integer])MultiPoint;Constructs a MultiPoint value using its WKT representation and SRID.
ST_MultiPointFromText(wkt varchar[, srid integer])MultiPoint;Constructs a MultiPoint value using its WKT representation and SRID.
ST_MPolyFromText(wkt varchar[, srid integer])MultiPolygon;Constructs a MultiPolygon value using its WKT representation and SRID.
ST_MultiPolygonFromText(wkt varchar[, srid integer])MultiPolygon;Constructs a MultiPolygon value using its WKT representation and SRID.
ST_PointFromText(wkt varchar[, srid integer])Point;Constructs a Point value using its WKT representation and SRID.
ST_PolyFromText(wkt varchar[, srid integer])Polygon;Constructs a Polygon value using its WKT representation and SRID.
ST_PolygonFromText(wkt varchar[, srid integer])Polygon;Constructs a Polygon value using its WKT representation and SRID.
ST_X(point)double;Returns the Xcoordinate value for the Point object p as a doubleprecision number.
ST_Y(point)double;Returns the Ycoordinate value for the Point object p as a doubleprecision number.
Geometry Format Conversion Functions
ST_AsBinary(g geometry)binary;Converts a value in internal geometry format to its WKB representation and returns the binary result.
ST_AsText(g geometry)string;Converts a value in internal geometry format to its WKT representation and returns the string result.
ST_AsWKB(g geometry)binary;Converts a value in internal geometry format to its WKB representation and returns the binary result.
ST_AsWKT(g geometry)string;Converts a value in internal geometry format to its WKT representation and returns the string result.
 Spatial Operator Functions
ST_Buffer(g, d[, strategy1[, strategy2[, strategy3]]])geometry;Returns a geometry that represents all points whose distance from the geometry value g is less than or equal to a distance of d, or NULL if any argument is NULL. The SRID of the geometry argument must be 0 because ST_Buffer() supports only the Cartesian coordinate system. If any geometry argument is not a syntactically wellformed geometry, an ER_GIS_INVALID_DATA error occurs.
ST_Buffer_Strategy(strategy[, points_per_circle])strategy_byte_string;This function returns a strategy byte string for use with ST_Buffer() to influence buffer computation. The result is NULL if any argument is NULL. If any argument is invalid, an ER_WRONG_ARGUMENTS error occurs.
ST_ConvexHull(g geometry)geometry;Returns a geometry that represents the convex hull of the geometry value g.
ST_Difference(g1 geometry, g2 geometry)geometry;Returns a geometry that represents the point set difference of the geometry values g1 and g2.
ST_Intersection(g1 geometry, g2 geometry)geometry;Returns a geometry that represents the point set intersection of the geometry values g1 and g2.
ST_SymDifference(g1 geometry, g2 geometry)geometry;Returns a geometry that represents the point set symmetric difference of the geometry values g1 and g2, which is defined as:
ST_Union(g1 geometry, g2 geometry)geometry;Returns a geometry that represents the point set union of the geometry values g1 and g2.
Spatial GeoJSON Functions
ST_AsGeoJSON(g geometry [, max_dec_digits integer [, options integer]])GeoJSON:Generates a GeoJSON object from the geometry g. The object string has the connection character set and collation.
ST_GeomFromGeoJSON(str [, options integer [, srid integer]])geometry;Parses a string str representing a GeoJSON object and returns a geometry.
Spatial Convenience Functions
ST_Distance_Sphere(g1 geometry, g2 geometry [, radius])spherical_distance;Returns the mimimum spherical distance between two points and/or multipoints on a sphere, in meters, or NULL if any geometry argument is NULL or empty.
ST_MakeEnvelope(pt1 point, pt2 point)rectangle;Returns the rectangle that forms the envelope around two points, as a Point, LineString, or Polygon. If any argument is NULL, the return value is NULL.
ST_Simplify(g geometry, max_distance double)geometry;Simplifies a geometry using the DouglasPeucker algorithm and returns a simplified value of the same type. If any argument is NULL, the return value is NULL.
ST_Validate(g geometry)integer;Validates a geometry according to the OGC specification. ST_Validate() returns the geometry if it is a valid geometry byte string and is geometrically valid, NULL if the argument is not a valid geometry byte string or is not geometrically valid or is NULL.
Spatial Relation Functions That Use Object Shapes
ST_Contains(g1 geometry, g2 geometry)integer;Returns 1 or 0 to indicate whether g1 completely contains g2. This tests the opposite relationship as ST_Within().
ST_Crosses(g1 geometry, g2 geometry)integer;The term spatially crosses denotes a spatial relation between two given geometries that has the following properties:
ST_Disjoint(g1 geometry, g2 geometry)integer;Returns 1 or 0 to indicate whether g1 is spatially disjoint from (does not intersect) g2.
ST_Distance(g1 geometry, g2 geometry)integer;Returns the distance between g1 and g2. If either argument is NULL or an empty geometry, the return value is NULL.
ST_Equals(g1 geometry, g2 geometry)integer;Returns 1 or 0 to indicate whether g1 is spatially equal to g2.
ST_Intersects(g1 geometry, g2 geometry)integer;Returns 1 or 0 to indicate whether g1 spatially intersects g2.
ST_Overlaps(g1 geometry, g2 geometry)integer;Two geometries spatially overlap if they intersect and their intersection results in a geometry of the same dimension but not equal to either of the given geometries.
ST_Touches(g1 geometry, g2 geometry)integer;Two geometries spatially touch if their interiors do not intersect, but the boundary of one of the geometries intersects either the boundary or the interior of the other.
ST_Within(g1 geometry, g2 geometry)integer;Returns 1 or 0 to indicate whether g1 is spatially within g2. This tests the opposite relationship as ST_Contains().
LineString and MultiLineString Property Functions
ST_EndPoint(ls)Point;Returns the Point that is the endpoint of the LineString value ls.
ST_IsClosed(ls)integer;For a LineString value ls, ST_IsClosed() returns 1 if ls is closed (that is, its ST_StartPoint() and ST_EndPoint() values are the same). For a MultiLineString value ls, ST_IsClosed() returns 1 if ls is closed (that is, the ST_StartPoint() and ST_EndPoint() values are the same for each LineString in ls).
ST_Length(ls)double;Returns a doubleprecision number indicating the length of the LineString or MultiLineString value ls in its associated spatial reference. The length of a MultiLineString value is equal to the sum of the lengths of its elements.
ST_NumPoints(ls)integer;Returns the number of Point objects in the LineString value ls.
ST_StartPoint(ls)Point;Returns the Point that is the start point of the LineString value ls.



Sat Jul 15, 2017 5:45 am 


SysOp
Site Admin
Joined: 26 Nov 2006 Posts: 6615




Thank you for your contribution. Much appreciated. I will submit it for review and addition to the factory default settings.


Sat Jul 15, 2017 7:44 am 


gemisigo
Joined: 11 Mar 2010 Posts: 1440




You're welcome. There'll be some details that will have to be taken care of eg. which versions it applies to. I guess it's 5.7.x for spatial function, where some variants without the ST_ prefix got deprecated and I've got absolutely no idea when the json functions came into picture. So there's still a lot to chew on this to make it work, but it might be a good start.


Sat Jul 15, 2017 7:55 am 




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