deg_grid_polar: Decimal degree grid from polar stereographic spatial objects

In MikkoVihtakari/PlotSvalbard: PlotSvalbard - Plot research data from Svalbard on maps

Decimal degree grid from polar stereographic spatial objects

Description

Outputs a list of grid lines that can be used to plot a grid on polar stereographic maps. Requires a spatial object projected using UTM coordinates

Usage

deg_grid_polar(
  dat,
  lat.interval = 10,
  lon.interval = 45,
  n.points = 1000,
  proj4.utm = TRUE,
  proj4.deg = "+proj=longlat +datum=WGS84"
)

Arguments

dat	Spatial object projected using UTM coordinates, such as readShapeSpatial OR a numeric vector of length 4 where first element defines the minimum longitude, second element the maximum longitude, third element the minimum latitude and fourth element the maximum latitude of the bounding box.
lat.interval	the interval of latitude grids for polar stereographic maps (type = "arctic50" or "arctic60")
lon.interval	the interval of longitude grids for polar stereographic maps (type = "arctic50" or "arctic60")
n.points	number of points used in creating the grid lines. The more points, the smoother the lines.
proj4.utm	projection in dat. If TRUE (default), fetches the projection from dat. If dat is a numeric vector and proj4.utm = TRUE, CRS("+init=epsg:32633") is used as UTM projection (the same projection than in Svalbard shapefiles).
proj4.deg	desired decimal degree projection. Uses a reasonable default projection. Do not change.
round.map	logical indicating whether the desired map is round TRUE or square FALSE. Bypasses certain routines, which caused errors.

Value

Returns a UTM coodrinate grid.

Author(s)

Mikko Vihtakari

See Also

basemap

MikkoVihtakari/PlotSvalbard documentation built on July 12, 2022, 10:20 a.m.