ssfctopolar(ssfc [, level)
Converts SSFCs (SierpiÅski Surface-Filling Coordinates) to polar coordinates. An ssfc (http://ssfc.quae.nl) indicates a position on the surface of a sphere with just one coordinate rather than with the usual two coordinates.
ssfc is of an integer type, then its values are
interpreted as ssfc indices at the indicated
are interpreted modulo
2^level. If no
is indicated, then it is taken to be equal to the least number that
accommodates the greatest value found in
ssfc, such that
max(ssfc < 2^level.
ssfc is of a floating-point type, then its values are
interpreted modulo 1, as decimal SSFCs. If
level is not
specified, then it is taken equal to the maxmimum value commensurate
with the data type.
The returned value is an array with 3 elements in its first dimension,
and with a set of 3 values for each value of
ssfc. The 3
values are the latitude, longitude, and angular size, all measured in
radians. Multiply by
#rad to get degrees (#rad).
The angular size is a measure for the size of the area on the surface
of the sphere that is indicated by the ssfc at the specified level.
See also: polartossfc