ggMap_getBasemapLayers: Create basemap layers for maps based on the 'ggplot2' package

In wStockhausen/rDisMELS: Basic functions for dealing with DisMELS IBM model output

Create basemap layers for maps based on the ggplot2 package

Description

This function creates a basemap layer for maps based on the ggplot2 package.

Usage

ggMap_getBasemapLayers(
  layer.land = wtsGIS::getPackagedLayer("Alaska"),
  layer.bathym = wtsGIS::getPackagedLayer("ShelfBathymetry"),
  final.crs = wtsGIS::get_crs("WGS84"),
  bbox = wtsROMS::getStandardBBox("CGOA shelf"),
  colors.bg = "white",
  colors.land = "grey85",
  colors.bathym = "darkblue",
  alpha.bathym = 1
)

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; default is "CGOA shelf")
colors.bg	- background color
colors.land	- color for land
colors.bathym	- color for the bathymetry
alpha.bathym	- transparency for the bathymetry

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.

This convenience function delegates all work to gg_CreateBasemapLayers. The final coordinate reference system (final.crs) can be any object that can be converted to a sf::crs object using get_crs.

The bounding box (bbox) can be any object that can be converted to a link[sf]{bbox} using getBBox.

Value

- a list of basemap layers based on the ggplot2 package, with elements #'

• bathym - geom_sf layer for bathymetry-based grid polygons

• land - geom_sf layer for land-based grid polygons

• map_scale - ggplot2 coord_sf object

• theme - partial ggplot2 theme with axis titles removed

See Also

See also gg_CreateBasemapLayers, getBBox, get_crs, getPackagedLayer, getPackagedLayer, getStandardBBox.

wStockhausen/rDisMELS documentation built on March 27, 2022, 1 a.m.