paxes: Display axes for projected coordinates
In jpfrench81/autoimage: Multiple Heat Maps for Projected Coordinates

Description Usage Arguments Details See Also Examples

paxes addes x and y axes to an existing plot for projected coordinates.

1	paxes(proj, xlim, ylim, xaxp, yaxp, grid = TRUE, axis.args, ...)

`proj`	A character string indicating what projection should be used for the included `x` and `y` coordinates. The default is `"none"`. The other valid choices correspond to the `"projection"` argument in the `mapproject` function, which is used for the projection.
`xlim`	A vector with the minimum and maximum value of the x coordinates. Taken from `par("usr")` if not provided.
`ylim`	A vector with the minimum and maximum value of the y coordinates. Taken from `par("usr")` if not provided.
`xaxp`	A vector of the form `c(x1, x2, n)` giving the coordinates of the extreme tick marks and the number of intervals between tick marks. Overrides `xlim`.
`yaxp`	A vector of the form `c(x1, x2, n)` giving the coordinates of the extreme tick marks and the number of intervals between tick marks. Overrides `ylim`.
`grid`	A logical value indicating whether grid lines should be displayed with the axes. Default is `TRUE`.
`axis.args`	A named list with components matching the arguments of `axis`. See Details and Examples.
`...`	Other arguments passed to the `[graphics]{lines}` function used to plot the grid lines.

The mapproject function is used for projection.

axis.args should be a named list matching the arguments of axis. The exception is that xat and yat can be specified to induce different spacing of the ticks on the x and y axes. Thus, the at argument is ignored and replaced by xat and yat, as appropriate.

image, mapproject

data(narccap)
# plot image using mercator projection (w/o axes)
pimage(lon, lat, tasmax[,,1], proj = "mercator", axes = FALSE)
# add axes with grey grid lines, blue text, and custom spacing
paxes("mercator", xlim = range(lon), ylim = range(lat), 
      col = "grey", 
      axis.args = list(col.axis = "blue", 
                       xat = c(-160, -100, -90, -80, -20)))