NURE {ramps}

Dataset of USGS NURE Uranium Measurements

Description

Connecticut, USA, areal and point-source uranium measurements from the United States Geological Survey (USGS) National Uranium Resource Evaluation (NURE) project.

Usage

data(NURE)

Format

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.

References

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.

Examples

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)