Changes in Version 1.4

The main purpose of this upgrade is to add polarimetry support to SURF.

New Tasks

• remip can be used to remove instrumental polarisation.
• add_dbm can be used to generate simulated dual beam images
• scusetenv for setting environment variables at the JAC.

Changes to existing tasks

• Units should now be propagated correctly through all tasks (ie calibration units are not lost after rebin or scuphot)

• SURF version number is now written to history information

• scan_rlb: Area to use for baseline removal can now be specified as a SCUBA section.

• remdbm : The -filter option will filter out high frequencies before inverting the Fourier transform.

• rebin:
  • Add TRIM parameter to trim edge regions from rebinned images (useful when trying to mosaic)

  • Astrometry information is now entirely contained in the AST/WCS component. No longer written to FITS or IRAS90 extensions. Also, the pixel origin is now centred on the specified RA/Dec centre of the image and not the bottom left hand corner.

  • REFPIX parameter has been added to make it easier to specify the reference pixel location when changing the map size (in the past the reference pixel was always the middle of the map when specifying the map size)

  • The output file is now propagated from the input when processing a single file (keeps history intact)

• intrebin: Waveplate position and sky rotation angle are now written to the fits headers for polarimetry observations.

• extinction: Can process FAST_AXIS polarimetry information correctly.

• skydip: Add preliminary support for RASTER mode (not yet stable)

• obssum: POLMAP and POLPHOT are now supported modes.

• scuphot: now recognizes measurements as well as integrations (required for polarimetry observing)

• scumakewt: Now can make a weights image like a reference image (ie same size, chop throw and position angle). See the LIKE parameter.