ST_Summary
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## Name

ST_Summary — Returns a text summary of the contents of a geometry.

## Synopsis

`text ST_Summary(`geometry g`)`;

`text ST_Summary(`geography g`)`;

## Description

Returns a text summary of the contents of the geometry.

Flags shown square brackets after the geometry type have the following meaning:

- M: has M coordinate

- Z: has Z coordinate

- B: has a cached bounding box

- G: is geodetic (geography)

- S: has spatial reference system

This method supports Circular Strings and Curves

This function supports Polyhedral surfaces.

This function supports Triangles and Triangulated Irregular Network Surfaces (TIN).

Availability: 1.2.2

Enhanced: 2.0.0 added support for geography

Enhanced: 2.1.0 S flag to denote if has a known spatial reference system

Enhanced: 2.2.0 Added support for TIN and Curves

## Examples

    =# SELECT ST_Summary(ST_GeomFromText('LINESTRING(0 0, 1 1)')) as geom,
            ST_Summary(ST_GeogFromText('POLYGON((0 0, 1 1, 1 2, 1 1, 0 0))')) geog;
                geom             |          geog
    -----------------------------+--------------------------
     LineString[B] with 2 points | Polygon[BGS] with 1 rings
                                 | ring 0 has 5 points
                                 :
    (1 row)

    =# SELECT ST_Summary(ST_GeogFromText('LINESTRING(0 0 1, 1 1 1)')) As geog_line,
            ST_Summary(ST_GeomFromText('SRID=4326;POLYGON((0 0 1, 1 1 2, 1 2 3, 1 1 1, 0 0 1))')) As geom_poly;
    ;
               geog_line             |        geom_poly
    -------------------------------- +--------------------------
     LineString[ZBGS] with 2 points | Polygon[ZBS] with 1 rings
                                    :    ring 0 has 5 points
                                    :
    (1 row)

## See Also

PostGIS_DropBBox, PostGIS_AddBBox, ST_Force3DM, ST_Force3DZ, ST_Force2D, geography

ST_IsValid, ST_IsValid, ST_IsValidReason, ST_IsValidDetail

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