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Fig. 1. (A) A schematic depiction of a planar substratum showing its altitude
(
) and azimuth (
) angles. N, north. (B) For a limpet on a
vertical planar substratum, lines of sight (depicted by the broken arrow)
within arc S end at the sky, whereas lines of sight within arc
O end at the ocean (which in this hypothetical case extends to
infinity in a horizontal plane). Because arc S and arc O
each account for half the `visual field' of the limpet, each has a view factor
of 0.5. The fraction of the view factor allocated to sky and ocean depends on
the altitude angle of the substratum (see text, Eqn 1 and 2).
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