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Subject: Polygon in TargetAreaType

Carl and others-


The Polygon element in targetArea is a list of lat lon pairs that represents a polygon.  However, one problem that I have noted when storing polygons in a geospatial database, or exposing to GIS tools is RingOrientation.  Notably, you normally follow the “left-hand” rule, which states that if you are walking the polygon you left hand should be pointing towards the center of the polygon area, which results in a counter-clockwise representation of points in the polygon.  If this is the case, I think our example in the DE documentation was constructed using the opposite linear ring orientation.  When validating a polygon, do we assume a certain ring orientation, or state that it can be either or, and just take the case that doesn’t span multiple hemispheres?


Don McGarry

The MITRE Corp.

Office: 315-838-2669

Cell: 315-383-1197



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