[R-sig-Geo] ramping four color in xy space

2008-11-18 Thread Holger Kreft
Hi, I have run a metaMDS(vegan) on ecological community data and have a nice plot in xy space. What I want to do next is to assign a unique color to each point in the plot and then look at how these communities map out in geographic space. So, each corner of the plot has a color (let's say

Re: [R-sig-Geo] ramping four color in xy space

2008-11-18 Thread Tomislav Hengl
Dear Holger, This is a small script that uses [colorspace] library to run calculations with colors (some methods are limited to 256 colors only): http://spatial-analyst.net/scripts/whitening.R If you assign R,G,B values spatially and then interpolate them (they have to be in the 0-1 range),

[R-sig-Geo] Spatial and temporal analysis

2008-11-18 Thread Raphael Saldanha
Hi! I'm looking for some introductory bibliography about modelling spatial and temporal series for areal data. Recommendations? -- King regards, Raphael Saldanha [EMAIL PROTECTED] [[alternative HTML version deleted]] ___ R-sig-Geo mailing

[R-sig-Geo] Classify x, y, z points based on upper-boundary surfaces

2008-11-18 Thread Waichler, Scott R
Hi, I have surfaces in ascii grid format that represent the elevation of the upper boundary of material types. I have multiple ascii grid files, one for each surface. The ascii grid files have the same x, y origin and discretization, but the elevations are continuous variables. I would like to

Re: [R-sig-Geo] ramping four color in xy space

2008-11-18 Thread Holger Kreft
Dear Tom, Thanks a lot for your swift reply. While your script wasn't exactly doing what I wanted, it brought me on the right track. Here is the code that I finally used. Probably not super elegant, but it does the job and I thought it be useful for others. Cheers, Holger --