https://github.com/cran/fields
Tip revision: d5f2ee6b54d2b8ab0c2a433f190233e9dde427e8 authored by Douglas Nychka on 04 February 2020, 15:30:02 UTC
version 10.3
version 10.3
Tip revision: d5f2ee6
CO.Rd
%# fields is a package for analysis of spatial data written for
%# the R software environment .
%# Copyright (C) 2018
%# University Corporation for Atmospheric Research (UCAR)
%# Contact: Douglas Nychka, nychka@mines.edu,
%# National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307-3000
%#
%# This program is free software; you can redistribute it and/or modify
%# it under the terms of the GNU General Public License as published by
%# the Free Software Foundation; either version 2 of the License, or
%# (at your option) any later version.
%# This program is distributed in the hope that it will be useful,
%# but WITHOUT ANY WARRANTY; without even the implied warranty of
%# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%# GNU General Public License for more details.
%#
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%# along with the R software environment if not, write to the Free Software
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%# or see http://www.r-project.org/Licenses/GPL-2
\name{Colorado Monthly Meteorological Data}
\alias{COmonthlyMet}
\alias{CO.elev}
\alias{CO.id}
\alias{CO.loc}
\alias{CO.names}
\alias{CO.ppt}
\alias{CO.ppt.MAM}
\alias{CO.tmax}
\alias{CO.tmax.MAM}
\alias{CO.tmin}
\alias{CO.tmin.MAM}
\alias{CO.years}
\alias{CO.ppt.MAM.climate}
\alias{CO.tmax.MAM.climate}
\alias{CO.tmean.MAM.climate}
\alias{CO.tmin.MAM.climate}
\alias{CO.elevGrid}
\alias{CO.Grid}
\title{Monthly surface meterology for Colorado 1895-1997}
\description{
Source:
These is a group of R data sets for monthly min/max temperatures and
precipitation over the period 1895-1997. It is a subset extracted from
the more extensive US data record.
Temperature is in degrees C and
precipitation is total monthly accumulation in millimeters. Note that
minimum (maximum) monthly tempertuare is the mean of the daily minimum
(maximum) temperatures.
Data domain:
A rectagular lon/lat region [-109.5,-101]x [36.5,41.5] larger than the
boundary of Colorado comprises approximately 400 stations. Although
there are additional stations reported in this domain, stations that
only report preicipitation or only report temperatures have been
excluded. In addition stations that have mismatches between locations
and elevations from the two meta data files have also been excluded. The
net result is 367 stations that have colocated temperatures and
precipitation.
}
\format{
This group of data sets is organized with the following objects:
\describe{
\item{CO.info}{A data frame with columns: station id, elev, lon, lat, station name}
\item{CO.elev}{elevation in meters}
\item{CO.elevGrid}{An image object being elevation in meters on a 4 km grid covering Colorado. }
\item{CO.id}{ alphanumeric station id codes}
\item{CO.loc}{locations in lon/lat}
\item{CO.Grid}{Just the grid.list used in the CO.elevGrid.}
\item{CO.ppt CO.tmax CO.tmin}{Monthly means as three dimensional arrays ( Year, Month, Station).
Temperature is in degrees C and precipitation in total monthly
accumulation in millimeters.}
\item{CO.ppt.MAM CO.tmax.MAM CO.tmin.MAM}{Spring seasonal means
(March, April,May) as two dimensional arrays
(Year, Station).}
\item{CO.MAM.ppt.climate CO.MAM.tmax.climate CO.MAM.tmin.climate}{Spring seasonal means
(March, April,May) means by station for the period 1960-1990. If less than 15 years are present over this period an NA is recorded.
No detreding or other adjustments have been made for these mean estimates.
}
}
}
\examples{
data(COmonthlyMet)
#Spatial plot of 1997 Spring average daily maximum temps
quilt.plot( CO.loc,CO.tmax.MAM[103,] )
US( add=TRUE)
title( "Recorded MAM max temperatures (1997)")
# min and max temperatures against elevation
matplot( CO.elev, cbind( CO.tmax.MAM[103,], CO.tmin.MAM[103,]),
pch="o", type="p",
col=c("red", "blue"), xlab="Elevation (m)", ylab="Temperature (C)")
title("Recorded MAM max (red) and min (blue) temperatures 1997")
#Fitting a spatial model:
obj<- Tps(CO.loc,CO.tmax.MAM.climate, Z= CO.elev )
good<- !is.na(CO.tmax.MAM.climate )
out<- MLE.Matern(CO.loc[good,],CO.tmax.MAM.climate[good],
smoothness=1.0, Z= CO.elev[good] )
#MLE search on range suggests Tps model
}
\section{Creation of data subset}{
Here is the precise R script used to create this data subset from the
larger US monthly data set. This parent, R binary file can be obtained
by contacting Doug Nychka (nychka@mines.edu).
These technical details are not needed for casual use of the data --
skip down to examples for some R code that summarizes these data.
\preformatted{
attach("RData.USmonthlyMet.bin")
#To find a subset that covers Colorado (with a bit extra):
indt<- UStinfo$lon< -101 & UStinfo$lon > -109.5
indt<- indt & UStinfo$lat<41.5 & UStinfo$lat>36.5
# check US(); points( UStinfo[indt,3:4])
#find common names restricting choices to the temperature names
tn<- match( UStinfo$station.id, USpinfo$station.id)
indt<- !is.na(tn) & indt
# compare metadata locations and elevations.
# initial matches to precip stations
CO.id<- UStinfo[indt,1]
CO.names<- as.character(UStinfo[indt,5])
pn<- match( CO.id, USpinfo$station.id)
loc1<- cbind( UStinfo$lon[indt], UStinfo$lat[indt], UStinfo$elev[indt])
loc2<- cbind( USpinfo$lon[pn], USpinfo$lat[pn], USpinfo$elev[pn])
abs(loc1- loc2) -> temp
indbad<- temp[,1] > .02 | temp[,2]> .02 | temp[,3] > 100
# tolerance at 100 meters set mainly to include the CLIMAX station
# a high altitude station.
data.frame(CO.names[ indbad], loc1[indbad,], loc2[indbad,], temp[indbad,] )
# CO.names.indbad. X1 X2 X3 X1.1 X2.1 X3.1 X1.2 X2.2 X3.2
#1 ALTENBERN -108.38 39.50 1734 -108.53 39.58 2074 0.15 0.08 340
#2 CAMPO 7 S -102.57 37.02 1311 -102.68 37.08 1312 0.11 0.06 1
#3 FLAGLER 2 NW -103.08 39.32 1519 -103.07 39.28 1525 0.01 0.04 6
#4 GATEWAY 1 SE -108.98 38.68 1391 -108.93 38.70 1495 0.05 0.02 104
#5 IDALIA -102.27 39.77 1211 -102.28 39.70 1208 0.01 0.07 3
#6 KARVAL -103.53 38.73 1549 -103.52 38.80 1559 0.01 0.07 10
#7 NEW RAYMER -103.85 40.60 1458 -103.83 40.58 1510 0.02 0.02 52
# modify the indt list to exclude these mismatches (there are 7 here)
badones<- match( CO.id[indbad], UStinfo$station.id)
indt[ badones] <- FALSE
###### now have working set of CO stations have both temp and precip
##### and are reasonably close to each other.
N<- sum( indt)
# put data in time series order instead of table of year by month.
CO.tmax<- UStmax[,,indt]
CO.tmin<- UStmin[,,indt]
CO.id<- as.character(UStinfo[indt,1])
CO.elev<- UStinfo[indt,2]
CO.loc <- UStinfo[indt,3:4]
CO.names<- as.character(UStinfo[indt,5])
CO.years<- 1895:1997
# now find precip stations that match temp stations
pn<- match( CO.id, USpinfo$station.id)
# number of orphans
sum( is.na( pn))
pn<- pn[ !is.na( pn)]
CO.ppt<- USppt[,,pn]
# checks --- all should zero
ind<- match( CO.id[45], USpinfo$station.id)
mean( abs( c(USppt[,,ind]) - c(CO.ppt[,,45]) ) , na.rm=TRUE)
ind<- match( CO.id[45], UStinfo$station.id)
mean( abs(c((UStmax[,,ind])) - c(CO.tmax[,,45])), na.rm=TRUE)
mean( abs(c((UStmin[,,ind])) - c(CO.tmin[,,45])), na.rm=TRUE)
# check order
ind<- match( CO.id, USpinfo$station.id)
sum( CO.id != USpinfo$station.id[ind])
ind<- match( CO.id, UStinfo$station.id)
sum( CO.id != UStinfo$station.id[ind])
# (3 4 5) (6 7 8) (9 10 11) (12 1 2)
N<- ncol( CO.tmax)
CO.tmax.MAM<- apply( CO.tmax[,3:5,],c(1,3), "mean")
CO.tmin.MAM<- apply( CO.tmin[,3:5,],c(1,3), "mean")
CO.ppt.MAM<- apply( CO.ppt[,3:5,],c(1,3), "sum")
# Now average over 1961-1990
ind<- CO.years>=1960 & CO.years < 1990
temp<- stats( CO.tmax.MAM[ind,])
CO.tmax.MAM.climate<- ifelse( temp[1,] >= 15, temp[2,], NA)
temp<- stats( CO.tmin.MAM[ind,])
CO.tmin.MAM.climate<- ifelse( temp[1,] >= 15, temp[2,], NA)
CO.tmean.MAM.climate<- (CO.tmin.MAM.climate + CO.tmin.MAM.climate)/2
temp<- stats( CO.ppt.MAM[ind,])
CO.ppt.MAM.climate<- ifelse( temp[1,] >= 15, temp[2,], NA)
save( list=c( "CO.tmax", "CO.tmin", "CO.ppt",
"CO.id", "CO.loc","CO.years",
"CO.names","CO.elev",
"CO.tmin.MAM", "CO.tmax.MAM", "CO.ppt.MAM",
"CO.tmin.MAM.climate", "CO.tmax.MAM.climate",
"CO.ppt.MAM.climate", "CO.tmean.MAM.climate"),
file="COmonthlyMet.rda")
}
}
\keyword{datasets}
% docclass is data
% Converted by Sd2Rd version 1.21.