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Re: How to perform a diagramm like these ? [message #49288]

Sun, 09 July 2006 07:44

greg michael
Messages: 163
Registered: January 2006

Senior Member

I think minimising the area won't get the result you want. I could
imagine many islands enclosing points connected by filament contour
tunnels. In the limit you could enclose all the points with zero area.
So I think you need also to specify some kind of minimum area
cell-size. If you break your area into an x-y grid this way, then it's
just a matter of counting how many points in each cell, and contouring
the x% densest ones. If you have a huge number of points, I would guess
that this works quite well. If not so many, then you might have to do
something cleverer - like generating a sum of gaussian distributions
with some radius centred on your points, and contouring that.

regards,
Greg

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