next up previous
Next: Changes Introduced in V1.5
Up: CHANGES AND NEW FEATURES
Previous: Changes Introduced in V1.3

Changes Introduced in V1.4

The following describes the most significant changes which occurred in the NDF_ system between versions V1.3 and V1.4 (not the current version):

1.
The routines NDF_TUNE and NDF_GTUNE have been extended to support the new DOCVT tuning parameter. This allows automatic conversion of foreign format data files (SSN/20) to be disabled when not required.
2.
The maximum number of foreign data formats that can be recognised by the NDF_ library (SSN/20) has been increased from 20 to 50.

3.
Two new routines NDF_GTWCS and NDF_PTWCS have been provided to read and write World Coordinate System (WCS) information to an NDF. These WCS facilities are implemented using the new AST library (see SUN/210). NDF_GTWCS returns an AST pointer to a FrameSet and NDF_PTWCS expects a similar pointer to be supplied.

Note that this constitutes only a preliminary introduction of WCS facilities to the NDF library, mainly to permit the writing of data format conversion applications that support WCS information. Descriptions of the new routines are included in this document, but the main text does not yet contain an overview of the WCS facilities, for which you should consult SUN/210 at present. Further recommendations on the use of AST with the NDF_ library will be given in future, once experience with the new facilities has been gained.

4.
The new ``WCS'' component is now supported by other NDF_ routines, where appropriate (e.g. NDF_PROP, NDF_RESET, NDF_SCOPY, NDF_SECT and NDF_STATE).

5.
A bug has been fixed in the NDF_SBB routine which could occasionally cause it to access the bad-bits value for the wrong NDF.

6.
A bug has been fixed which could result in failure to access a named NDF data structure comprising one of the AXIS components of another NDF (for example, ``NDF.AXIS(2)'').

7.
The documentation (SUN/33 and SSN/20) has been updated to reflect these changes.



next up previous
Next: Changes Introduced in V1.5
Up: CHANGES AND NEW FEATURES
Previous: Changes Introduced in V1.3


Starlink User Note 33
R.F. Warren-Smith
11th January 2000
E-mail:rfws@star.rl.ac.uk

Copyright © 2000 Council for the Central Laboratory of the Research Councils