|> I am looking for an Algorithm, which is capable to generate "iso"-Lines
|> out of a set of points. That means:
|> I have a number of Points, e.g. X/Y and pressure. In this case i want to
|> generate isobares (is this the correct term). I tried to interpret pressure
|> as z-value and generated triangles. Then i computete the intersection between
|> a Plane of constant z and the triangles. The Result: Lines of equal pressure.
|> But: The lines are ugly because they consist of straight segments. For a
|> map-like plot i need smooth curves. I tried splines, but there are cases, when
|> those splines intersect. Any solution out there?
|> Ciao, Udo
You will find some answers in my book -
CONTOURING: A guide to the analysis and display of spatial data,
Pergamon Press, 1992, ISBN 0 08 040286 0
This book catalogues and categorizes all the published methods I could
find and has about 600 references. The code that comes with the book
implements 18 interpolation methods, 5 gradient estimation methods, and
7 display methods. Apparently the most useful, reliable, and general,
method is natural neighbour interpolation. This is a relatively unknown
weighted average method using a variable number of area-based local
Details of a commercial gridding program using natural neighbour
interpolation is available by email from the undersigned.
Department of Mathematics Tel: (61 9) 380 3359
The University of Western Australia FAX: (61 9) 380 1028
Nedlands, WA 6009 Australia. Real data are full of surprises