Distance measures available in distance

Description

The great circle distance is calculated by the function rdist.earth in library fields.

Details

The distance measures implemented in sphet are:

• 'euclidean': √{∑{(x_i - y_i)^2}}

• 'chebyshev': max(|x_i - y_i|)

• 'braycur': frac{∑{|x_i - y_i|}}{∑{|x_i + y_i|}}

• 'canberra': frac{∑{|x_i - y_i|}}{∑{|x_i| + |y_i|}}

• 'gcircle': see spDists, which uses an approximation to the WGS84 spheroid.

Author(s)

Gianfranco Piras gpiras@mac.com

See Also

gstslshet, distance, distance

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