Tickets/dm 5503 #37
Tickets/dm 5503 #37
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r-owen
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| class MakeHscRawVisitInfo(MakeRawVisitInfo): | ||
| """Make a VisitInfo from the FITS header of a Subaru HSC image | ||
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| Boresight rotation angle is apparently not available. |
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What about INR-STR and INR-END? I think these are "instrument rotator at start" and "instrument rotator at end". There's also INST-PA which must be "instrument position angle".
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Thanks. Do you have specifications for any of these? I would like to know exactly what 0 and 90 degrees mean for the orientation of N and E with respect to detector X and Y (assuming sky rotation, which seems most likely, but a similar question for any other kind of rotation).
INSTR-PA is in my sample HSC data, but not my sample sample Suprimecam data. It is probably the angle we want. INR-STR/END change over time and so are likely rotator mount angle (or similar), and if so, not useful enough to record in VisitInfo.
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There are no comments on the HSC engineering data I looked at. Here's what I have from a Suprime-Cam frame (SUPA01270732.fits):
INR-STR = 65.186 / [degree] Inst. rotator angle at start
INR-END = 65.185 / [degree] Inst. rotator angle at end
INST-PA = 90.000 / Position Angle of Instrument
Oooh! A more recent HSC exposure (HSCA08609518.fits) has comments on the headers too:
INR-STR = -26.982 / [degree] Inst. rotator angle at start
INR-END = -26.982 / [degree] Inst. rotator angle at end
INST-PA = 0.000 / [degree] Position Angle of the Instrument Flang
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Thanks. The subprime data I have also has that comment; I just don't know what "Position Angle of the Instrument" actually means. I could guess, but it is safer not to!
| from __future__ import print_function | ||
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| import astropy.units | ||
| import astropy.time |
r-owen
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I made all suggested changes, rebased and pushed. I documented the possibilities for setting rotator angle but did not implement them yet for lack of necessary information. It is trivial to add this later when the information becomes available. |
standardizeCalib is no onger required because lsst.daf.base.exposureFromImage can now do the job.
r-owen
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Note: I also looked for Calib.getExptime, Calib.getMidTime and Calib.setMidTime but did not find them.
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