These data are used in the book "Computational Statistics" 
by G.H. Givens and J.A. Hoeting.

Name: colorado.dat
Chapter: 6
Discussed in: Terrain navigation examples 6.7 - 6.8

Description: Topographical data for a region of Colorado

Variable labels: These data have a special format.  Note below:

######################################################
##The Colorado data are stored as a matrix suitable
##for reading and plotting using the image() command.
##The first row and column of the matrix are *not* 
##elevations.  They are lat,lon coordinates (with a NA
##in the 1,1 spot in the matrix.  The first row and column
##should therefore be stripped away (see below).  The
##remainder of the matrix gives elevations over the
##coordinate system.  In summary, the following R
##code should be used to read and arrange the data:
##

colo=as.matrix(read.table(file="colorado.dat",sep="",header=F))
colorado.lat=colo[1,-1]
colorado.lon=colo[-1,1]
colorado.elev=colo[-1,][,-1]
dim(colorado.elev)  #should be 186 x 125
image(colorado.lon,colorado.lat,colorado.elev,col=gray(seq(.25,1,len=200)),
 xlim=c(-6000,34000),ylim=c(-6000,34000))

##
#################################################