Next: OverWriting Up: Quality processing commands Prev: Examples

QUALITY

This is the general quality manipulation command. The user interface of QUALITY is firstly concerned with selecting those points in the input dataset whose quality is to be manipulated, and then with the selection operation of the operation to be performed.

Selection of points is achieved by specifying zero or more of the following keywords,

AXSEL
Selection on basis of axis value ranges
FSEL
Selection on spatial axes using info in ARD file
DATSEL
Selection on basis of data value
MAGIC
Specialised version of DATSEL which locates data values containing a "magic" value
QSEL
Select on basis of existing quality value
If none of these options are chosen then all points are selected. If more than one is specified then the selections of points are combined in the AND sense (ie. only those points included by all selectors are picked).

QUALITY supports the following operations on the selected points. Note that an operation must be selected on the command line, otherwise the error "No QUALITY operation selected" will appear.

   QUALITY IGNORE  - Sets the temporary bad quality bit,    (=IGNORE)
                     leaving the rest unaltered.
   QUALITY RESTORE - Clears the temporary bad quality bit,  (=RESTORE)
                     restoring the original quality value.
   QUALITY SET     - Sets quality to a specified value.     (=SETQUAL)
   QUALITY NOT     - Complements existing quality values.
   QUALITY AND     - ANDs existing quality with specified
                     value.
   QUALITY OR      - ORs existing quality with specified
                     value.
   QUALITY EOR     - EORs existing quality with specified
                     value.

Subtopics:

Next: OverWriting Up: Quality processing commands Prev: Examples