Firstly, I'm not sure what data format(s) your gps exports, but if GPX
is one of them I suggest you have a look at the new gpx package...
http://javadoc.geotools.fr/2.5/org/geotools/data/gpx/package-summary.html
I haven't used this package but it may well do a lot of what you need.
Meanwhile, if you are working with raw data, creating polygons "by
hand" each of your farm buildings from corner/vertex coords is very
straightforward...
/// warning - mixture of pseudo code and java !
GeometryFactory gf = new GeometryFactory();
List<Polygon> polys = new ArrayList<Polygon>();
for each building... {
int nv = ... numer of vertices in this building
Coordinate[] vertices = new Coordinate[nv + 1]
int k = 0;
for each vertex with ordinates x, y {
vertices[k++] = new Coordinate(x, y);
}
vertices[k] = vertices[0]; // end vertex == start vertex to 'close' polygon
Polygon poly = new gf.createPolygon(gf.createLinearRing(vertices), null);
polys.add(poly);
}
For GeometryFactory, Polygon and Coordinate classes see the docs at:
http://tsusiatsoftware.net/jts/javadoc/index.html
Michael
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