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The following describes the most significant changes which occurred in
the AST library between versions V1.2 and V1.3 (not the most recent
version):
- 1.
- A new set of functions, AST_RESAMPLE<X>, has been introduced to
provide efficient resampling of gridded data, such as spectra and
images, under the control of a geometrical transformation specified by
a Mapping. A variety of sub-pixel interpolation schemes are supported.
- 2.
- A new class, PcdMap, has been introduced. This is a specialised
form of Mapping which implements 2-dimensional pincushion or barrel
distortion.
- 3.
- A bug has been fixed which could cause a FitsChan to produce too
many digits when formatting floating point values for inclusion in a
FITS header if the numerical value was in the range -0.00099999...
to -0.0001.
- 4.
- A bug has been fixed which could cause a FitsChan to lose the
comment associated with a string value in a FITS header.
- 5.
- A FitsChan now reports an error if it reads a FITS header which
identifies a non-standard sky projection (previously, this was
accepted without error and a Cartesian projection used instead).
- 6.
- A bug has been fixed which could prevent conversion between the
coordinate systems represented by two CmpFrames. This could only occur
if the CmpFrames contained a relatively large number of nested Frames.
- 7.
- Further improvements have been made to the simplification of
compound Mappings, including fixes for several bugs which could cause
indefinite looping or unwanted error messages.
- 8.
- Some memory leaks have been fixed.
- 9.
- A small number of documentation errors have been corrected.
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Up: Changes and New Features
Previous: Changes Introduced in V1.2
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk
Copyright (C) 2003 Central Laboratory of the Research Councils