GISHullActor
org.ecoinformatics.seek.gis.grass.GISHullActor

The purpose of this actor is to take a set of (x, y) points and return the points that define the convex hull around the input. The convex hull can be thought of as the region defined by a 'rubber band' placed around the original data set. It is a sort of smallest polygon surrounding the input. The ConvexHull routine from grass is called via JNI for this calculation. 'pointFileName' is a tab delimited text file with x,y input points 'numSitePoint' is the number of x,y pairs in the pointFileName file 'hullFileName' is the name to be given to the hull point list file 'numHullPoint' is the number of x,y pairs in the hull file 'hullFileResult' is the output hull file name (same value as the 'hullFileName' but used as a trigger for output

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