Re: [R-sig-Geo] Summary of multiple rasters

2010-05-03 Thread Tomislav Hengl
Dear Johannes, Looks like you are in the field of error propagation [http://spatial-accuracy.org/workshopSUP]. Both mean and median are valid statistical parameters to describe the central tendencies. What is often more interesting is the propagated uncertainty in the final estimates. I

Re: [R-sig-Geo] help with color scale

2010-05-03 Thread Jim Lemon
On 05/03/2010 04:10 AM, Muhammad Rahiz wrote: Hi all, I hope someone can help me with this. Given, library(fields) x - array(rnorm(100),dim=c(50,50)) image.plot(x) I want to change the range in the color bar so that the range is from -1 to 1. I did adjust the image.plot() command to

Re: [R-sig-Geo] help with color scale

2010-05-03 Thread Muhammad Rahiz
Thanks Arien Jim for the useful tips. I've used both methods suggested but am still not getting the desired results. The problem with my actual data is that it contains several extreme values/outliers.The lab.breaks argument in image.plot() is able to assign a color to a specific range of

[R-sig-Geo] Mapping a factor

2010-05-03 Thread Roberto Patuelli
Dear All, I'm having trouble mapping the levels of a factor. This is the code I have as of now. The legend works fine (suggesting that item colours is correct), but not the map! gino = factor(data_abs1$Ethnic.Dominance, labels = c( French, German, Italian, Portuguese, Spanish, Fmr.

[R-sig-Geo] negative range from fit.variogram through autofitVariogram

2010-05-03 Thread Mark Connolly
I am using autofitVariogram during the process of interpolating a large set of daily observations through a volume. Each volume is decomposed into 2D layers prior to selecting a model to use for interpolation. I made it through 2010 interpolations and then ran into a failed interpolation