Guillaume Chérel wrote:
As for the details about my problem, I'm trying to compute the total surface of overlapping disks. I approximate the surface with a grid and count how many points of the grid fall into at least one disk.
That is a highly approximate way to do it - which may be fine, but I doubt any floating point errors you get are going to make it worse.
if you know of another good way to compute the surface of overlapping disks, I'd be glad to know.
Are these "disks" exactly round? If so -- use coordinate geometry to calculate it exactly (or as exactly as floating point allows ;-) ) I just googled: "area of intersecting circles" And got a bunch of hits. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker@noaa.gov