Mehdi Khan wrote:
Sorry about that, this is what I did:
wald<-read.table ("C:/Documents and Settings/MK/My Documents/USGS/R
Data/wald/california.xyz")
names(wald)[1]<- "LON"
names(wald)[2]<- "LAT"
names(wald)[3]<- "vs30"
coordinates(wald)<- c("LON", "LAT")
gridded(wald)<- TRUE
suggested tolerance minimum: 0.125000000000666
Error in points2grid(points, tolerance, round, fuzz.tol) :
dimension 1 : coordinate intervals are not constant
Hi,
This error suggests that the data in california.xyz is actually not on a
regularly spaced grid.
cheers,
Paul
note: this is the same data frame I asked a question about last week.
There is also a grid file available but it seems extremely difficult
to get it to read in R. ideas?
On Wed, Aug 26, 2009 at 1:19 PM, Paul Hiemstra <p.hiems...@geo.uu.nl
<mailto:p.hiems...@geo.uu.nl>> wrote:
Mehdi Khan schreef:
Hello everyone, I have a table with 2 columns containing
geographical
coordinates (lat, long) and one column containing attribute
data. This is a
data frame object which I would like to convert into a grid
object. It is
the 7.3 mb "california" file on this page:
http://earthquake.usgs.gov/research/hazmaps/interactive/vs30/predefined.php
I tried to use the "gridded" command, but it did not work for
my data. Is
there any other method? Thank you!
Mehdi Khan
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How exactly did you try the gridded command. Please be specific.
cheers,
Paul
--
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: +3130 274 3113 Mon-Tue
Phone: +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul
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