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== Known issues ==
* There is a known threading problem that prevents the Java application Treeview from working on HDS Version 5 (HDF5) files.
Starlink Software Collection — 2018A Release Notes
The new HDS-V5 data format (which uses HDF5) is now available. In this release the default will be to write all files as HDS-V4, unless the environmental variable HDS_VERSION is set to 5. This is described in Jenness 2015 2015A&C....12..221 . We are planning to make this file format the default starting with our next release, so we would please request any issues or comments be sent on to us: either on the Starlink users' mailing list, the Starlink developers' mailing list, or sent directly to EAO with the helpdesk AT eaobservatory.org email address.
- The ARY library has been converted to C.
- Perl updated to Version 5.26.1.
- Further improvements to POL-2 data reduction software, including (experimental) skyloop modes and (experimental) 450 micron reductions.
- Expanded cookbook for heterodyne data reduction, including spectral analysis with SPLAT.
Changes to Applications
- The FINDCLUMPS command now uses a better method for finding elliptical approximations for highly non-elliptical clumps. The previous method could produce extremely long thin ellipses for such clumps.
- When reading a multiple-line ARD region to extract a spectrum, all newlines and spaces are removed so that it can be saved.
- Key fonts with compound names can now be saved to the configuration of the contour toolbox.
- HTTP request headers should now use the correct line termination.
A new estimator, "FastMed" has been added to COLLAPSE. It offers faster much faster calculation of unweighted medians.
- WCSALIGN can now use a catalogue such as produced by POLPACK to define the reference grid (previously only an NDF could be used).
- The weighting scheme used by ALIGN2D has been changed so that alignment is determined more by the brighter sections of the map than previously.
- In WCSMOSAIC, each input NDF can now have a specified weight in the final mosaic.
- SETAXIS has a new mode that reads the new axis values from the "Data" component of another NDF.
- New command POLCONCAT to concatenate multiple vector catalogues.
- New command POLSELECT allows vectors to be selected in various ways, including using an NDF as a mask.
- The dome status has been added to scuba2_index / acsis_index.
- POL2MAP: New parameter "binsize" allows he size of the bins in the final catalogue to be specified.
- POL2MAP: New IP models at 450 um and 850 um.
- POL2MAP: Improve pointing correction.
- POL2MAP: Change default 450 um pixel size to 4 arc-sec.
- POL2MAP: Allow SKYLOOP to be used to create maps rather than MAKEMAP.
- POL2MAP: Allow observations to be weighted on the basis of how similar they are to the mean of the other observations.
- POL2MAP: Allow minor changes in FCF to be detected and corrected when mosaicing observations.
- POL2MAP: An error is now reported if the input data is not all for the same source.
- SKYLOOP: Allow maps made from individual observations to be saved.
- SKYLOOP: Allow data models to be stored in a specified directory rather than the current directory.
- The included JCMT source catalog has been updated.
- A bug relating to the receipt of spectra through local URLs via SAMP has been fixed.
- The submillimetre line identifier catalog has been updated.
- Updated to Version 3.1-4.
- Updated to Version 4.6-1.
Changes to Libraries
- The Fortran ARY library has been completely re-written in C.
- New function !astActiveObjects returns pointers for all currently active AST objects, filtered by class.
- New function !astCreatedAt returns information about where an object was created.
- The 1astChannel class now uses more precision when writing out floating point values, resulting in write-read round trips being lossless.
The FitsChan class has a new attribute "FitsTol" that specifies the maximum deviation from linearity allowed for the Mapping from pixel coordinates to intermediate world coordinates when writing out a FrameSet using FITS-WCS encoding.
!astSimplify will now merge a diagonal MatrixMap with an adjacent WinMap to create a modified WinMap.
The FitsChan class has a new attribute "SipReplace", which can be used to prevent the automatic replacement of inverse SIP coefficients when a FITS-WCS header including SIP distortion is read.
Improved simplification of CmpMaps including WcsMaps.
The FitsChan !astWrite method can now create FITS-WCS headers that include SIP distortion keywords, given a suitable FrameSet.
- A few small memory leaks have been fixed.
- The astRebinSeq function can now use a specified weight with each input data array.
Improvements to the accuracy of the iterative inverse used by the PolyMap class.
- Several new string manipulation functions.
- The maximum length of a group expression has been increased from 255 to 2047 characters.
- A new package called "hds-v5" has been created that contains a complete re-write of the existing HDS API using HDF5. The original code that deals with "native" HDS files has been moved to a new package called "hds-v4". The "hds" package is now simply a layer that chooses whether to call the appropriate function from hds-v4 or hds-v5. When reading an existing "HDS" file it chooses the package corresponding to the format of the existing file (either v4 or v5). When creating a new "HDS" file, it chooses the format specified by the HDS_VERSION environment variable (which currently defaults to v4).
- C wrappers have been added for more routines.
- Limits on the length of the command line and on the length of individual file paths have been relaxed.
- Updated to Version 3.3-1.
Updated to current upstream version 3.43. This includes a security fix that NASA/HEASARC recommended all CFITSIO users should install. See https://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/docs/changes2.txt
- The shell "login" and "profile" scripts now add Starlink to the start (rather than the end) of LD_LIBRARY_PATH.
- The shell "login" and "profile" scripts now define ORAC_PERLBIN.
Changes to Cookbooks and Guides
- SC/20 (Heterodyne Data Reduction) expanded to include an illustrated chapter on spectral analysis (e.g. identification of telluric lines, noise estimation, and line fitting) with SPLAT, and various small corrections to Chapters 3 and 5 to 8.
- SC/21 (SCUBA-2 Data Reduction) was given a spring clean, that includes clarifications, and fixes to typo's and cross references.
- SC/22 (POL-2 Data reduction) updated to match the current software. It has a new chapter on using TOPCAT with vector catalogues, and example maps created using OBSWEIGHT and SKYLOOP.
- There is a known threading problem that prevents the Java application Treeview from working on HDS Version 5 (HDF5) files.