Spitzer Documentation & Tools
CUBISM Change Log

Reference Paper

The CUBISM algorithm and its implementation are described in detail in:

Smith, J.D.T. et al., Spectral Mapping Reconstruction of Extended Sources, 2007 PASP, 119.1133S

Please reference this paper for published use of the tool.

Changes for Version 1.8

- Updated calibration for IRS pipeline vesion S18.18.

- Updates for compatibility with IDL version 8.

- Fix crash which occurred with highly trimmed WAVSAMP boundaries.

- Backtracking pixels in the cubes updates selected records in a Visualization image (great for seeing where data which contributed to a given cube pixel came from on the sky).

- Sort by column in the Backtrack window - useful for quickly identifying outliers.

- Ensure proper units are saved in FITS cubes.

- Update IRAC filter curves (normalized and photon-counting) in CubeSpec.

- Handle NaN's more correctly in simple rectangular extractions.

Changes for Version 1.7

- Updated calibration for IRS pipeline version S18.7.

- Log scaling in CubeViewSpec.

- Scroll wheel to change selected region size or change wavelength in CubeViewSpec.

- Fixed "off by one pixel" error in DS9 .reg files *written* (not read) by CUBISM.

- Properly handle backtracking cubes with empty 'NaN' regions, and better NaN handling in cube creation and record stacks.

- Better memory handling during clipping, resulting in another 20-40% speedup of raw cube build.

- Higher precision C DLM clipping for identical results to IDL-native version.

Changes for Version 1.6

- Updated Calibration sets for IRS pipeline version S17 (with particular improvement in LH order stitching).

- CubeView: can now move box regions (histogram, stats, etc.) outside of zoomed area.

- Prompt before clearing bad pixels.

- Support reading/writing DS9 polygonal and circular regions (FK5 WCS coordinates only) for extraction apertures.

- Display saved extraction regions on visualization image.

- Reversible color tables.

- Squash many small bugs.

Changes for Version 1.5

- You can now directly load CUBISM-produced FITS cubes into CubeView. When opening a cube project (e.g. on the initial call to 'cubism'), select a FITS cube file instead of '.cpj' CUBISM project file. Not all operations are possible when viewing FITS cubes, but you can extract, make line maps, etc.

- Shipped with a calibration set for S15 IRS pipeline data.

- A completely new clipping architecture speeds up the initial cube build ("colored rectangles" phase) by 4-8x. This is true only for the auto-compiled C version (so it's even more important now to ensure IDL can find your compiler!).

- The speed of a full cube rebuild ("marching white boxes" phase) has also been improved by a factor of 5-10. These two improvements together make it far less important to save clipping accounts with the cube, since they can now be regenerated up to 10x faster.

- QuickBuild: when toggling or loading bad pixels, CUBISM keeps track of which cube pixels are affected, and only rebuilds these "dirty" pixels. Even for very large cubes, testing out a small batch of bad pixel changes is now very fast. Look for the new "Build Cube" button in the CUBISM Project window to change to "QuickBuild".

- Record-level bad pixels can now be marked on multiple records at once, when a stack of multiple records is being viewed.

- Correctly handle spaces in path names.

- Custom cursors in CubeView inform you which mode you are in (zoom, histogram, extraction, etc.).

- You can now keep cube backtracking enabled while switching to another tool (e.g. zoom, you can now zoom in and then resume backtracking).

- New option "These records" when right-clicking on a given pixel in the backtrack window, to set a record-level bad pixel in all the listed records with this pixel coordinate.

- When the assembled cube is updated, automatically re-extract any existing extracted spectrum being displayed. This is very useful with QuickBuild to check the effect of setting a small number of bad pixels on a (potentially spurious) spike in a spectrum.

- New CubeView key shortcuts 0-4, to resize the display window to fixed sizes 1-4, with 0 meaning large enough to show the full image at the current zoom level.

- Multi-extension FITS files can be read in as visualization images; you'll be prompted for which extension to read.

- CubeSpec can make "integrated" maps, integrating f_nu d_nu, and converting the units (e.g. to W/m^2/sr). Useful for line integrations.

- Weighted maps (e.g. MIPS 24um) are produced correctly, and can also be integrated over (weighted by d_nu, so the flux units are preserved).

- The CubeSpec window can be resized.

- On OSX, Cubism.app should correctly start X11 and target the correct X display for any version of IDL >= 6.1

- Numerous minor bug-fixes and improvements.

Changes for Version 1.02

- Problems with the VM version quitting after any error is acknowledged, and incorrect handling of errors.

- Single record only backgrounds complaining about the need to rebuild the cube.

- Can now accommodate spaces in the filepath for the Cubism.app MacOSX version, and/or .cpj files (this may have been responsible for some MacOSX users reporting trouble launching Cubism.app).

- Killing the window with window manager does not remove window until after prompting to save unsaved changes.

- Simplified panning of zoomed images in CubeView: similar to DS9 (middle or control-click to recenter).