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- Newsgroups: comp.graphics
- Path: sparky!uunet!munnari.oz.au!uniwa!watson
- From: watson@maths.uwa.oz.au (David Watson)
- Subject: Re: Contour plotting for non-uniformly distributed data
- Message-ID: <1992Aug24.002753.9242@uniwa.uwa.edu.au>
- Sender: news@uniwa.uwa.edu.au (USENET News System)
- Nntp-Posting-Host: madvax.maths.uwa.oz.au
- Organization: University of Western Australia
- References: <1992Aug21.200107.25597@ctr.columbia.edu>
- Date: Mon, 24 Aug 1992 00:27:53 GMT
- Lines: 53
-
- anselmo@cumesb.mech.columbia.edu (Andrew P. Anselmo) writes:
-
- >Sorry if this a FAQ, but I'm looking for a public domain program (on
- >Sun, running OpenWindows/X) to do some simple contour plots. What
- >I do need, however, is a program that can accept non-uniform grids.
-
- >I've tried the program Contour (ktoh@mascot.berkeley.edu), yet this
- >is only for uniform grids. I've also tried a program called graph and
- >plot (by S. Narasimhan) (for X-windows),
- > but I seem to have some problems running it on my machine. I was
- >wondering if anyone knew of other general purpose contour plotting
- >programs.
-
- >The best solution would be to get a program like SURFER, written
- >for PC clones, which I've used in the past, and has a lot of neat features.
-
-
- You need a gridding program to generate a regular grid from the from
- the scattered data. There are many algorithms to do this such as
- inverse distance weighting, triangle-based methods, radial basis
- functions, and natural neighbour interpolation. For a short survey of
- such methods
-
- ftp cod.nosc.mil /pub/grid.ps
- ftp cod.nosc.mil /pub/grid.tex
- ftp cod.nosc.mil /pub/grid.ascii
-
- The comments in this survey are extracted from the book
-
- CONTOURING: A Guide to the Analysis and Display of Spatial Data
- by David F. Watson ISBN 0 08 040286 0
- to be published by Pergamon Press in the last quarter of 1992.
-
- Promotional material about this book will be sent to anyone who
- sends their address to
-
- Sue Cloke
- Senior Marketing Manager
- Earth & Environmental Sciences
- Pergamon Press Ltd
- Headington Hill Hall
- Oxford OX3 OBW
- UK
-
- A gridding program that uses natural neighbor interpolation, NNGRIDR,
- is available commercially. Send email to me for details.
-
-
- --
- Dave Watson Internet: watson@maths.uwa.edu.au
- Department of Mathematics
- The University of Western Australia Tel: (61 9) 380 3359
- Nedlands, WA 6009 Australia. FAX: (61 9) 380 1028
-