[R] Normal score transform of spatial data
Thomas Adams
Thomas.Adams at noaa.gov
Fri Jul 28 19:58:15 CEST 2006
List:
I have 2 related questions:
(1) first I have x-y-z data, where x & y are the geographic locations of
point values, z. I need to perform a normal score transform on the
z-values and maintain their geographic location. So, how do I go from
columns x-y-z to x-y-z-t (or x-y-t), where the t-values are the normal
score transforms of the z-values? Can I use qnorm(ppoints(data)) to do
this; how?
(2) I also need to do a reverse transform of a matrix of normal score
values (v) to my original data value units; I have seen that I can use
something like approx(t, x, v)$y. Again, the matrix represents a spatial
grid. So, how do I maintain the same spatial ordering resulting from the
reverse transform?
Thank you for your help.
Regards,
Tom
--
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177
EMAIL: thomas.adams at noaa.gov
VOICE: 937-383-0528
FAX: 937-383-0033
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