[R] how to make a contour plot using data in long format
mariayzw at hotmail.com
Thu Jul 13 16:25:59 CEST 2006
There is a dataset with Latitude Longitude information and corresponding
value shaped like this:
Lati Longi Value
18.0001 -159.6667 123
18.0023 -159.6665 124
19.1001 -158.2988 125
... ... ...
I want to use this data to make a filled contour map imposed on an USA map.
I notice filled.contour command can be used to make contour plots, but it
requires the data in a matrix. Would someone please tell me if
filled.contour is the right thing to look at, if so, how to reshape the data
into a matrix since my Latitude and Longitude are not evenly distributed?
More information about the R-help