For map distance unit, append unit d for arc degree, m for arc minute, and s for arc second, or e for meter [Default unless stated otherwise],
f for foot,
k for km,
M for statute mile,
n for nautical mile, and
u for US survey foot. By default we compute such distances using a spherical approximation with great circles (
spherical=:greatcircle) using the authalic radius (see
PROJ_MEAN_RADIUS). You can use
spherical=:flat to perform “Flat Earth” calculations (quicker but less accurate) or
spherical=:ellipsoidal to perform exact geodesic calculations (slower but more accurate; see
PROJ_GEODESIC for method used).
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