extract_gshhg: Extract Region from GSHHG

In jmlondon/nPacMaps: North Pacific Maps

Description

Functions to extract specified N. Pacific regions from the GSHHG dataset

This map region is centered on the Bering Sea. Coordinates are returned in the Lambert-Azimuthal Equal Area Bering Sea Projection (epsg:3571)

This map region covers the extent of Alaska. Coordinates are returned in the Alaska Albers Projection (epsg:3338)

This map region covers the US Arctic region centered on northern Alaska. The region extends into the Russian East Siberian Sea and the Eastern Beaufort Sea of Canada. Coordinates are returned in the Lambert-Azimuthal Equal Area Alaska Projection (epsg:3572).

This map region covers the entire North Pacific Ocean from Hawaii in the south to the Bering Sea in the north. Coordinates are returned in the PDC Mercator Projection (epsg:3832)

This map region covers the California current off of the west coast of the United States. The region extends from southern British Columbia, Canada to the Baja Peninsula of Mexico. Coordinates are returned in the California (Teale) Albers Projection (epsg:3310).

Usage

extract_gshhg(xlims, ylims, resolution = "i", epsg, fortify = TRUE,
  sf = FALSE)

bering(xlims = c(180 - 50, 180 + 55), ylims = c(35, 80), resolution = "i",
  epsg = "3571", fortify = TRUE)

alaska(xlims = c(180 - 5, 180 + 50), ylims = c(35, 75), resolution = "i",
  epsg = "3338", fortify = TRUE)

us_arctic(xlims = c(180 - 2, 180 + 50), ylims = c(60, 90),
  resolution = "i", epsg = "3572", fortify = TRUE)

npac(xlims = c(180 - 50, 180 + 70), ylims = c(20, 67), resolution = "i",
  epsg = "3832", fortify = TRUE)

calcur(xlims = c(180 + 35, 180 + 70), ylims = c(26, 52), resolution = "i",
  epsg = "3310", fortify = TRUE)

Arguments

xlims	a vector of x coordinate limits; 0-360 degrees in most cases. When straddling 0, pass -longitude values (up to -180) for the left side.
ylims	a vector of y coordinate limits: 0-90 degrees
resolution	either "f", "h", "i", or "c"
epsg	character indicating the numeric epsg value (e.g. "3571")
fortify	TRUE/FALSE whether to return a fortified data.frame for ggplot (now relies on broom::tidy instead of ggplot2::fortify())
sf	TRUE/FALSE whether to return and sf (simple features) object

jmlondon/nPacMaps documentation built on May 5, 2018, 6:37 p.m.