Fulmaris glacialis data

Airborne counts of Fulmaris glacialis during the Aug/Sept 1998 and 1999 flights on the Dutch (Netherlands) part of the North Sea (NCP, Nederlands Continentaal Plat).

Usage

data(fulmar)

Format

This data frame contains the following columns:

year

year of measurement: 1998 or 1999

x

x-coordinate in UTM zone 31

y

y-coordinate in UTM zone 31

depth

sea water depth, in m

coast

distance to coast of the Netherlands, in km.

fulmar

observed density (number of birds per square km)

Author

Dutch National Institute for Coastal and Marine Management (RIKZ)

See also

ncp.grid

E.J. Pebesma, R.N.M. Duin, P.A. Burrough, 2005. Mapping Sea Bird Densities over the North Sea: Spatially Aggregated Estimates and Temporal Changes. Environmetrics 16, (6), p 573-587.

Examples

data(fulmar)
summary(fulmar)
#>       year            x                y               depth     
#>  Min.   :1998   Min.   :476210   Min.   :5694947   Min.   : 1.0  
#>  1st Qu.:1998   1st Qu.:535522   1st Qu.:5806777   1st Qu.:13.0  
#>  Median :1999   Median :568618   Median :5896021   Median :25.0  
#>  Mean   :1999   Mean   :576982   Mean   :5889112   Mean   :23.6  
#>  3rd Qu.:1999   3rd Qu.:604579   3rd Qu.:5946550   3rd Qu.:32.0  
#>  Max.   :1999   Max.   :739042   Max.   :6150942   Max.   :54.0  
#>      coast             fulmar      
#>  Min.   :  1.024   Min.   : 0.000  
#>  1st Qu.:  4.857   1st Qu.: 0.000  
#>  Median : 38.696   Median : 0.000  
#>  Mean   : 56.642   Mean   : 1.005  
#>  3rd Qu.: 89.929   3rd Qu.: 0.000  
#>  Max.   :263.205   Max.   :46.487  
if (FALSE) { # \dontrun{
demo(fulmar)
} # }