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A Library for Handling

World Coordinate Systems

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#### Description:

The
NormMap class implements a

Mapping which normalises coordinate values using the

astNorm
function of a supplied

Frame. The number of inputs and outputs of a NormMap are both
equal to the number of axes in the supplied Frame.

The forward and inverse transformation of a NormMap are both defined but are identical
(that is, they do not form a real inverse pair in that the inverse transformation does
not undo the normalisation, instead it reapplies it). However, the astSimplify function
will replace neighbouring pairs of forward and inverse NormMaps by a single UnitMap (so
long as the Frames encapsulated by the two NormMaps are equal - i.e. have the same
class and the same attribute values). This means, for instance, that if a CmpMap
contains a NormMap, the CmpMap will still cancel with its own inverse.

#### Constructor
Function

#### Inheritance

The NormMap class inherits from the Mapping
class.

#### Attributes

The NormMap class does not define any new attributes beyond
those which are applicable to all Mappings.

#### Functions

The NormMap class does not
define any new functions beyond those which are applicable to all Mappings.

Copyright (C) 2019 East Asian Observatory

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A Library for Handling

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