Takes a bounding box and a cell size in degrees and returns a
data-FeatureCollection of flat-topped hexagons
(data-Polygon features) aligned in an "odd-q" vertical
grid as described in Hexagonal Grids
Usage
lawn_hex_grid(extent, cellWidth, units)
Arguments
extent
(numeric) Extent in [minX, minY, maxX, maxY] order.
cellWidth
(integer) Width of each cell.
units
(character) Units to use for cellWidth, one of 'miles' or
'kilometers'.