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Units
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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