<ul><li>A polygon in PostGIS is a two-dimensional geometric object representing an enclosed area defined by one or more rings.</li><li>Polygon parameters in PostGIS consist of coordinates forming rings where the first and last point must be the same to close the loop.</li><li>The 'ST_' prefix in PostGIS denotes 'Spatial Type' and is used for spatial functions following OGC standards.</li><li>Common ST_ functions in PostGIS include ST_GeomFromText, ST_Area, ST_Length, ST_Intersects, ST_Contains, ST_Buffer, and ST_Distance.</li></ul>

Understanding Polygons and `ST_` Functions in PostGIS

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