Calculate resolution for target area

Uses the cell count formula N = d * aperture^res + 2, d the solid's diamond quads; on the icosahedron (d = 10) this is the 'ISEA3H'/'ISEA4H'/'ISEA7H' count, which matches 'dggridR' resolution numbering exactly.

Usage

calculate_resolution_for_area(
  target_area_km2,
  aperture = 3,
  radius_km = EARTH_RADIUS_KM,
  polyhedron = "icosahedron"
)

Arguments

target_area_km2

Target area in square kilometers

aperture

Aperture (3, 4, or 7)

radius_km

Radius of the body, in kilometers

polyhedron

The solid the grid is built on

Value

Resolution level, not rounded. A target larger than the cells of resolution 0 gives -Inf.