PBSmapping: nepacLL – R documentation

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nepacLL

Data: Shorelines of the NE Pacific Ocean and of the World

Description

PolySet of polygons for the shorelines of the northeast Pacific Ocean and of the world, both in normal and high resolution.

Usage

data(nepacLL)
  data(nepacLLhigh)
  data(worldLL)
  data(worldLLhigh)

Format

Data frame consisting of 4 columns: PID = primary polygon ID, POS = position of each vertex within a given polygon, X = longitude coordinate, and Y = latitude coordinate. Attributes: projection = "LL".

Note

In R, the data must be loaded using the data function.

Author(s)

Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
Last modified Rd: 2015-01-22

Source

Polygon data from the GSHHG (Global Self-consistent, Hierarchical, High-resolution Geography) Database.
Download the native binary files of shoreline polygons, rivers, and borders contained in the latest zip archive (version 2.3.4 ) at http://www.soest.hawaii.edu/pwessel/gshhg/.

nepacLL <- importGSHHS("gshhs_h.b", xlim=c(-190,-110), ylim=c(34,72), 
           level=1, n=15, xoff=-360)

nepacLLhigh <- importGSHHS("gshhs_f.b", xlim=c(-190,-110),
               ylim=c(34,72), level=1, n=0, xoff=-360)
nepacLLhigh <- thinPolys(nepacLLhigh, tol=0.1, filter=3)

worldLL <- importGSHHS("gshhs_l.b", xlim=c(-20,360), ylim=c(-90,90), 
           level=1, n=15, xoff=0)
worldLL <- .fixGSHHSWorld(worldLL)

worldLLhigh <- importGSHHS("gshhs_i.b", xlim=c(-20,360),
               ylim=c(-90,90), level=1, n=15, xoff=0)
worldLLhigh <- .fixGSHHSWorld(worldLLhigh)

References

Wessel, P. and Smith, W.H.F. (1996) A global, self-consistent, hierarchical, high-resolution shoreline database. Journal of Geophysical Research 101, 8741–8743.
http://www.soest.hawaii.edu/pwessel/gshhg/Wessel+Smith_1996_JGR.pdf