read_shoreline: Read shoreline from GSHHG

In jiho/shoreliner: Download and Process Shorelines from the GSHHG database

Description

Read shoreline from GSHHG

Usage

read_shoreline(resolution = "c", levels = c(1, 5),
  path = getOption("shoreline.path"))

Arguments

resolution	resolution at which the data should be read; either the full name, an abbreviation, or a number. 1 : cruise (c) 2 : low (l) 3 : intermediate (i) 4 : high (h) 5 : full (f)
levels	levels of the data that should be read 1: Continental land masses and ocean islands, except Antarctica. 2: Lakes 3: Islands in lakes 4: Ponds in islands within lakes 5: Antarctica based on ice front boundary. 6: Antarctica based on grounding line boundary.
path	path to the GSHHG data. By defautl this is set by an option. If the data is not found, it will be downloaded.

Value

A "simple feature" (sf) object.

Examples

shorepath <- system.file("extdata", ".", package="shoreliner")
# NB: this is a very reduced version of the data, only for tests

# various abbreviations can be used
w <- read_shoreline("cruise", 1, path=shorepath)
w <- read_shoreline("c", 1, path=shorepath)
w <- read_shoreline(1, 1, path=shorepath)
plot(w, max.plot=1)

# the resulting objet can be manipulated with all the functions in sf
sf::st_bbox(w)
plot(sf::st_crop(w, xmin=-10, xmax=50, ymin=30, ymax=70), max.plot=1)
# etc.

jiho/shoreliner documentation built on May 21, 2019, 1:43 a.m.