Bug #1335
open
No date present in output image header
100%
Description
In some cases Swarp does not include any date information (MJD-OBS or DATE-OBS) in the header of the output image, even though it is present in each of the individual input image.
Updated by Herve Bouy over 2 years ago
A sample of 3 DECam images, associated weight files and external headers (from scamp) and default.swarp are available on morpho in:
/raid/hbouy/debug_swarp/1335
Updated by Emmanuel Bertin over 2 years ago
- % Done changed from 0 to 10
- Estimated time set to 2.00 h
Actually SWarp does not output such keyword by default. But it can certainly be done. Merging images from different epochs will lead to an output DATE-OBS (or MJD-OBS) taken from the earliest exposure.
Note that the epoch of the middle of the new "virtual" exposure won't be MJD-OBS + EXPTIME / 2.0, so it will be of limited use for general usage. But I get your point and I will implement this.
Updated by Emmanuel Bertin over 2 years ago
- Status changed from New to In Progress
Updated by Herve Bouy over 2 years ago
Emmanuel Bertin wrote:
Actually SWarp does not output such keyword by default. But it can certainly be done. Merging images from different epochs will lead to an output DATE-OBS (or MJD-OBS) taken from the earliest exposure.
But in the case of these images, no MJD-OBS is present in the coadd even though the individual input images each had an MJD-OBS in their header.
Note that the epoch of the middle of the new "virtual" exposure won't be MJD-OBS + EXPTIME / 2.0, so it will be of limited use for general usage. But I get your point and I will implement this.
Updated by Emmanuel Bertin over 2 years ago
- % Done changed from 10 to 100