ozone {fields} | R Documentation

## Data set of ozone measurements at 20 Chicago monitoring stations.

### Description

The `ozone` data is a list of components, x and y. x component is longitude and latitude position of each of the 20 Chicago monitoring stations, y is the average daily ozone values over the time period 6/3/87-8/30/87.

### Format

This data set is a list containing the following components:

lon.lat
  Longitude-latitude positions of monitoring stations.
x
  An approximate Cartesian set of coordinates for the locations where the units are in miles. The origin is in the center of the locations.
y
  Average daily ozone values over 1987 summer.

### Source

AIRS, the EPA air quality data base.

### See Also

Tps, Krig

### Examples

    fit<- Tps(ozone$x, ozone$y)
    # fitting a surface to ozone measurements.
    surface( fit, type="I")

[Package fields version 6.01 Index]