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Nine points is a quite small number, so I would use some arbitrary boundary instead of trying to build a complex algorithm that might "go wild". I suggest that you use r.grow.distance in grass to create a distance layer around your points, and to set a threshold that would constraint the size of your study area (for instance, the largest distance value ...


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While very limited in their presentation, Google Fusion tables have the advantage that they present a very familiar map interface if you have a broad, non-GIS user community. After all, everybody has used Google maps.



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