Connecticut, USA, areal and point-source uranium measurements from the United States Geological Survey (USGS) National Uranium Resource Evaluation (NURE) project.
The following variables are provided in the
NURE data frame:
uranium measurements in parts per million.
type of measurement: 1 = areal, 2 = point-source.
longitude coordinates of point-source measurements.
latitude coordinates of point-source measurements.
Universal Transverse Mercator easting coordinates - projected distances from the central meridian.
Universal Transverse Mercator northing coordinates - projected distances from the equator.
counties from which measurements were taken.
county land mass areas in square miles.
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
longitude coordinates of grid sites.
latitude coordinates of grid sites.
Areal measurements in
NURE can be matched to the grid coordinates in
NURE.grid via the shared
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.
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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)