Hello, I have a little problem while begining to use gstat. I try to resume: I have an area of 20km on 6 kms extend. On the sea. It was covered by special tracking element with GPS on. So I have some 80000 3D coordinates but mainly with lines separated by 500m.
I removed the tides, and now I want to get a marine geoid in this area. There is a trend (about 5cm/km in one direction). Except this trend, the variations are small. But a fine resolution is necessary. Here joined (as attached file) is the gnuplot file generated by your software. I have problems to find a model of variogram. There's no sill appearing. Did someone encounter such kind of problem (and find the reason)? Other indication I'm serching for: Is there a map (grid) format, available for gstat which could be generated by hand? Something like indicating the coordinates of 2 corners and the steps of increase in x and y? Thanks for any indication Alain
gg_tot.eps
Description: PostScript document
