| nepacLLhigh {PBSmapping} | R Documentation |
PolySet of polygons for the northeast Pacific Ocean shoreline.
data(nepacLLhigh)
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".
In R, the data must be loaded using the data function.
In S, the data are loaded automatically on demand.
Polygon data from the GSHHS (Global Self-consistent, Hierarchical, High-resolution Shoreline) database.
We thinned the full resolution GSHHS binary data with a tolerance of
0.1 km and then converted it to ASCII data using the supplied software
(gshhs_dp.exe and gshhs.exe, respectively). Using a
Perl script (gshhs2r.pl), we then converted this ASCII format
to ours and removed the lakes, islands in lakes, and ponds in
islands. We then clipped the data to 170 <= x <= 250 degrees and 34 <= y <= 72 degrees (the GSHHS coordinates roughly span
0 degrees to 360 degrees). Finally,
we subtracted 360 degrees from all of the remaining
x-coordinates, so that the Greenwich meridian becomes
0 degrees and the northeast Pacific Ocean has negative
x-coordinates corresponding to longitudes west of 0
degrees.
Wessel, P., and W.H.F. Smith. 1996. A global, self-consistent,
hierarchical, high-resolution shoreline database, Journal of
Geophysical Research 101: 8741-8743.
http://www.soest.hawaii.edu/pwessel/pwessel_pubs.html
addPolys,
bcBathymetry,
clipPolys,
nepacLL,
plotPolys,
plotMap,
PolySet,
thickenPolys,
thinPolys.