Changes between Version 8 and Version 9 of BluePrintGISStorage


Ignore:
Timestamp:
09/26/10 21:21:35 (11 years ago)
Author:
Fran Boon
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • BluePrintGISStorage

    v8 v9  
    2424ST_Intersects(geography, geography) returns boolean
    2525
     26ST_Centroid(geometry) returns a point that is approximately on the center of mass of the input argument. This simple calculation is very fast, but sometimes not desirable, because the returned point is not necessarily in the feature itself. If the input feature has a convexity (imagine the letter ā€˜Cā€™) the returned centroid might not be in the interior of the feature.
     27ST_PointOnSurface(geometry) returns a point that is guaranteed to be inside the input argument. It is substantially more computationally expensive than the centroid operation
     28
    2629}}}
    2730