lsst.obs.decam.makeTransmissionCurves Namespace Reference

Functions
	getDESAtmosphereTransmission ()
	getDESSystemTransmission ()

Variables
	DATA_DIR = os.path.join(getPackageDir("obs_decam_data"), "decam", "transmission_curves")
str	DECAM_BEGIN = "2012-09-12"

Function Documentation

getDESAtmosphereTransmission()

lsst.obs.decam.makeTransmissionCurves.getDESAtmosphereTransmission

(

)

Return a dictionary of TransmissionCurves describing the atmospheric
throughput at CTIO.

Dictionary keys are string dates (YYYY-MM-DD) indicating the beginning of
the validity period for the curve stored as the associated dictionary
value.  The curve is guaranteed not to be spatially-varying.

Definition at line 37 of file makeTransmissionCurves.py.

def getDESAtmosphereTransmission():
    """Return a dictionary of TransmissionCurves describing the atmospheric
    throughput at CTIO.
 
    Dictionary keys are string dates (YYYY-MM-DD) indicating the beginning of
    the validity period for the curve stored as the associated dictionary
    value.  The curve is guaranteed not to be spatially-varying.
    """
    table = astropy.io.fits.getdata(os.path.join(DATA_DIR, "des", "des_atm_std.fits"))
 
    atm = TransmissionCurve.makeSpatiallyConstant(
        throughput=table["throughput_atm"].astype(np.float64),
        wavelengths=table["lambda"].astype(np.float64),
        throughputAtMin=table["throughput_atm"][0],
        throughputAtMax=table["throughput_atm"][-1],
    )
 
    return {DECAM_BEGIN: atm}
 
 

getDESSystemTransmission()

lsst.obs.decam.makeTransmissionCurves.getDESSystemTransmission

(

)

Return a nested dictionary of TransmissionCurves describing the
system throughput (optics + filter + detector) at the location of
each detector.

Outer dictionary keys are string dates (YYYY-MM-DD).  The next level
dictionary maps the physical filter name to another dict.  The inner
dict is keyed by detector number.

Definition at line 57 of file makeTransmissionCurves.py.

def getDESSystemTransmission():
    """Return a nested dictionary of TransmissionCurves describing the
    system throughput (optics + filter + detector) at the location of
    each detector.
 
    Outer dictionary keys are string dates (YYYY-MM-DD).  The next level
    dictionary maps the physical filter name to another dict.  The inner
    dict is keyed by detector number.
    """
    # We have DES detector throughputs for the grizy bands.
 
    bands = ["g", "r", "i", "z", "Y"]
 
    filter_dict = {}
    for band in bands:
        for filter_def in DECAM_FILTER_DEFINITIONS:
            if band == filter_def.band:
                physical_filter = filter_def.physical_filter
                break
 
        table = astropy.io.fits.getdata(
            os.path.join(DATA_DIR, "des", f"{band}_band_per_detector_throughput.fits"),
        )
 
        detector_dict = {}
        for index in range(table['throughput_ccd'].shape[1]):
            # The DECam detector starts at 1.
            detector = index + 1
 
            tput = TransmissionCurve.makeSpatiallyConstant(
                throughput=table["throughput_ccd"][:, index].astype(np.float64),
                wavelengths=table["lambda"].astype(np.float64),
                throughputAtMin=0.0,
                throughputAtMax=0.0,
            )
 
            detector_dict[detector] = tput
 
        filter_dict[physical_filter] = detector_dict
 
    return {DECAM_BEGIN: filter_dict}

Variable Documentation

DATA_DIR

lsst.obs.decam.makeTransmissionCurves.DATA_DIR = os.path.join(getPackageDir("obs_decam_data"), "decam", "transmission_curves")

Definition at line 32 of file makeTransmissionCurves.py.

DECAM_BEGIN

str lsst.obs.decam.makeTransmissionCurves.DECAM_BEGIN = "2012-09-12"

Definition at line 34 of file makeTransmissionCurves.py.