NURE | R Documentation |
Connecticut, USA, areal and point-source uranium measurements from the United States Geological Survey (USGS) National Uranium Resource Evaluation (NURE) project.
data(NURE)
The following variables are provided in the NURE
data frame:
ppm
uranium measurements in parts per million.
measurement
type of measurement: 1 = areal, 2 = point-source.
lon
longitude coordinates of point-source measurements.
lat
latitude coordinates of point-source measurements.
easting
Universal Transverse Mercator easting coordinates - projected distances from the central meridian.
northing
Universal Transverse Mercator northing coordinates - projected distances from the equator.
county
counties from which measurements were taken.
area
county land mass areas in square miles.
id
unique identifiers for measured counties or sites.
A grid of coordinates is provided by the NURE.grid
data frame to facilitate Monte Carlo integration in geostatistical modeling of areal measurements. The included columns are
lon
longitude coordinates of grid sites.
lat
latitude coordinates of grid sites.
id
county identifiers.
Areal measurements in NURE
can be matched to the grid coordinates in NURE.grid
via the shared "id"
variable.
Duval, J.S., Jones, W.J., Riggle, F.R., and Pitkin, J.A. (1989) “Equivalent uranium map of conterminous United States”, USGS Open-File Report 89-478.
Smith, S.M.(2006) “National Geochemical Database Reformatted Data from the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) Program”, USGS Open-File Report 97-492.
data(NURE)
## Map areal and point-source measurements
ppm1 <- NURE$ppm[NURE$measurement == 1]
level <- (max(ppm1) - ppm1) / diff(range(ppm1))
map("county", "connecticut", fill = TRUE, col = gray(level))
title("Connecticut Uranium Measurements")
points(NURE$lon, NURE$lat)
## Map grid sites
map("county", "connecticut")
title("Regular Grid of Coordinates")
points(NURE.grid$lon, NURE.grid$lat)
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