tmap_CreateBasemap: Create a basemap layer for maps based on the tmap package

In wStockhausen/wtsGIS: Functions, Rmd scripts, and datasets to facilitate GIS operations

Create a basemap layer for maps based on the tmap package

Description

This function creates a basemap layer for maps based on the tmap package.

Usage

tmap_CreateBasemap(
  layer.land = getPackagedLayer("Alaska"),
  layer.bathym = getPackagedLayer("ShelfBathymetry"),
  final.crs = get_crs("WGS84"),
  bbox = getStandardBBox("EBS"),
  colors.bg = "white",
  colors.land = "grey85",
  colors.bathym = "darkblue",
  alpha.bathym = 1,
  points.size = 0.01
)

Arguments

layer.land	a sf::sf object representing land
layer.bathym	a sf::sf object representing bathymetry
final.crs	representation of final (display) coordinate reference system (see details)
bbox	a bounding box (see details)
colors.bg	background color
colors.land	color for land
colors.bathym	color for the bathymetry
alpha.bathym	transparency for the bathymetry
points.size	size of points, in map units

Details

The basemap contains a land layer (polygons) and a bathymetry layer (lines). Uses getPackagedLayer() or readShapefile() to create the land and bathymetric layers. If bbox is NULL, then the bounding box for the land layer is used as the bounding box for the basemap.

The final coordinate reference system (final.crs) can be any object that can be converted to a sf::st_crs() object using get_crs().

The bounding box (bbox) can be any object that can be converted to a sf::bbox using getBBox().

Value

• basemap layer based on the tmap package

wStockhausen/wtsGIS documentation built on Aug. 23, 2023, 2:31 a.m.