Remove dependence of obs_lsstSim for geometry information.

[cwwalter]

This is different than #121 which addresses using the camera objects to get sensor information for writing the amp files. This work primarily involves how sims_galSimInterface gets various geometry information.

[cwwalter]

@danielsf and @jchiang87 I lost track of the status of this one. There were some failing tests etc which stopped previous work last I heard. Has anything changed?

[jchiang87]

As far as I know, no new work had been done on this. It's still an open issue.

[cwwalter]

OK. Can we live with this for DC2? Or should we target it for changing?

[jchiang87]

I think we should just live with it for DC2. I doubt Scott or I have time to deal with it.

[cwwalter]

OK removing not adding a DC2 label to this (but not pushing all the way to DC3).

[cwwalter]

Note: sims_galSimInterface is also depending on obs_lsstSim through its use of an LsstObservatory() object used to return telescope position with code like:

        observatory = LsstObservatory()
         self.fitsHeader.set('OBS-LONG', observatory.getLongitude().asDegrees())
         self.fitsHeader.set('OBS-LAT', observatory.getLongitude().asDegrees())
         self.fitsHeader.set('OBS-ELEV', observatory.getElevation())
         obs_location = observatory.getLocation()
         self.fitsHeader.set('OBSGEO-X', obs_location.geocentric[0].value)
         self.fitsHeader.set('OBSGEO-Y', obs_location.geocentric[1].value)
         self.fitsHeader.set('OBSGEO-Z', obs_location.geocentric[2].value)

Are there other ways to get this information?

[jchiang87]

I think the equivalent of https://github.com/lsst/obs_lsstSim/blob/master/python/lsst/obs/lsstSim/makeLsstSimRawVisitInfo.py#L37 needs to be implemented in obs_lsst. Note that LsstObservatory is just a class in sims_GalSimInterface: https://github.com/lsst/sims_GalSimInterface/blob/master/python/lsst/sims/GalSimInterface/galSimDetector.py#L684

[cwwalter]

Per @danielsf this work is currently planned on a June 2019 timescale.

[cwwalter]

We now rely on the science pipelines obs_lsst for camera information.