Wouter Steenbeek <WSteenbeek <at> nscr.nl> writes: Your problem suggests that the spatial extent is not very large. I have a similar problem with over 600,000 data points. They describe bathymetric measurements of the lake. I'm working on making contours..
Project all of your coordinates on a plane. Means that you can work with meters instead of lat/lon. Euclidian distances are easily calculated, d = sqrt((x-x1)^2 + (y-y1)^2). You have to write a few lines of basic code in R. Setup the problem with a database or write/read a textfile. Routine computations like this 600,000 times looking at each of the 600,000 points, takes under a minute on my aging Mac. I hope this helps. _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
