tm_grid

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Coordinate grid lines

Creates a tmap-element that draws coordinate grid lines. It serves as a layer that can be drawn anywhere between other layers. By default the coordinate system of the (master) shape object is used, which results in horizontal and vertical lines. Alternatively, grid lines can be reprojected, for instance to latitude longitude coordinates, and hence be curved.

Usage
tm_grid(x = NA, y = NA, n.x = NA, n.y = NA, projection = NA,
  col = NA, lwd = 1, alpha = NA, labels.size = 0.6, labels.col = NA,
  labels.margin.x = 0, labels.margin.y = 0, labels.inside.frame = TRUE)
Arguments
x
x coordinates for vertical grid lines. If NA, it is specified with a pretty scale and n.x.
y
y coordinates for horizontal grid lines. If NA, it is specified with a pretty scale and n.y.
n.x
prefered number of grid lines for the x axis.
n.y
prefered number of grid lines for the y axis.
projection
projection character. If specified, the grid lines are projected accordingly. See set_projection for projection details. Many world maps are projected, but still have latitude longitude ("longlat") grid lines.
col
color of the grid lines.
lwd
line width of the grid lines
alpha
alpha transparency of the grid lines. Number between 0 and 1. By default, the alpha transparency of col is taken.
labels.size
font size of the tick labels
labels.col
font color of the tick labels
labels.margin.x
margin between tick labels of x axis and the frame
labels.margin.y
margin between tick labels of y axis and the frame
labels.inside.frame
Show labels inside the frame?
Aliases
  • tm_grid
Documentation reproduced from package tmap, version 1.10, License: GPL-3

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