postgis-workshop

geometries_exercises

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	Geometry Exercises
	Here's a reminder of all the functions we have seen so far. They should be useful for the exercises!
	:command:`sum(expression)` aggregate to return a sum for a set of records
	:command:`count(expression)` aggregate to return the size of a set of records
	:command:`ST_GeometryType(geometry)` returns the type of the geometry
	:command:`ST_NDims(geometry)` returns the number of dimensions of the geometry
	:command:`ST_SRID(geometry)` returns the spatial reference identifier number of the geometry
	:command:`ST_X(point)` returns the X ordinate
	:command:`ST_Y(point)` returns the Y ordinate
	:command:`ST_Length(linestring)` returns the length of the linestring
	:command:`ST_StartPoint(geometry)` returns the first coordinate as a point
	:command:`ST_EndPoint(geometry)` returns the last coordinate as a point
	:command:`ST_NPoints(geometry)` returns the number of coordinates in the linestring
	:command:`ST_Area(geometry)` returns the area of the polygons
	:command:`ST_NRings(geometry)` returns the number of rings (usually 1, more if there are holes)
	:command:`ST_ExteriorRing(polygon)` returns the outer ring as a linestring
	:command:`ST_InteriorRingN(polygon, integer)` returns a specified interior ring as a linestring

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../../en/geometries_exercises.rst:6

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postgis-intro/sources/locale/pot/geometries_exercises.pot, string 2