$<$QUALITY$>$ Structure

This structure is used for storing data-quality information.

Table: Components of $<$QUALITY$>$ structure

Component Name	TYPE	Brief Description
[VARIANT]	$<$_CHAR$>$	registered variant
[QUALITY]	$<$p_array$>$	quality value of each pixel
[BADBITS]	$<$_UBYTE$>$	mask of allowed bad bits in quality

[VARIANT]

Currently can only be `SIMPLE'.

[QUALITY]

The data-quality value(s). If it is scalar it applies to all the pixels. The actual or equivalent primitive type must be $<$_UBYTE$>$. Mandatory.

The rôle of data-quality and how it can be used to advantage were described earlier.

[BADBITS]

A set of 8 one-bit flags which flag that the corresponding data quality bits indicate bad pixels; if omitted a default value of zero (i.e. data quality is ignored in deciding whether a pixel is bad or not) is assumed.