gshhsMask: A land mask based on the GSHHS data set

Description Usage Arguments Value References See Also Examples

View source: R/landmask.R

Description

Generate a land mask function based on the Global Self-consistent, Hierarchical, High-resolution Geography Database. The mask is provided at two (approximate) spatial resolutions: 0.1 degree and 0.05 degrees. The latter requires significantly more memory. The mask is constant and the tm argument to the mask is ignored.

Usage

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gshhsMask(res = 0.1)

landmask_init(res = 0.1)

Arguments

res

numeric: the spatial resolution of the mask, in degrees (either 0.1 or 0.05)

Value

function that returns a logical indicating whether the point is at sea (TRUE) or on land (FALSE)

References

Wessel, P., and W. H. F. Smith, A Global Self-consistent, Hierarchical, High-resolution Shoreline Database, J. Geophys. Res., 101, #B4, pp. 8741-8743, 1996. https://www.ngdc.noaa.gov/mgg/shorelines/gshhs.html

See Also

surrogateAR

Examples

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mask  <- gshhsMask() ## initialize land mask function
mask(0,c(100,-65)) ## test point lon,lat

AustralianAntarcticDataCentre/availability documentation built on Nov. 28, 2018, 3:46 a.m.