Predict
Simulate visibilities for a given sky model .
inputs
type
- type:
string- doc:
Case-insensitive step type; must be ‘predict’ .
applycal.*
- doc:
Set of options for applycal to apply to this predict. For this applycal-substep, .invert is off by default, so the predicted visibilities will be corrupted with the parmdb .
beammode
- type:
enum- doc:
Same as in ApplyBeam step .
- symbols:
array_factor,element,default
beamproximitylimit
- type:
float- doc:
Same as in ApplyBeam step .
correctfreqsmearing
- type:
boolean- default:
False- doc:
Simulate frequency smearing based on the channel width, by multiplying the visibility with a sinc function .
correcttimesmearing
- type:
int- default:
1- doc:
Apply time smearing correction by upsampling the uvw values before predicting and averaging the predicted data afterwards. The value is the upsampling and averaging factor. A value of 0 or 1 disables time smearing.
elementmodel
- type:
enum- default:
hamaker- doc:
Specifies which beam model to use .
- symbols:
hamaker,lobes,oskar,oskardipole
onebeamperpatch
- type:
boolean- doc:
Same as in ApplyBeam step .
operation
- type:
string- default:
replace- doc:
Should the predicted visibilities be output as is (
replace, default), should they be subtracted from the input visibilities (subtract) or added to them (add) .
outputmodelname
- type:
string- default:
""- doc:
Name for writing the predicted visibilities in the output DPBuffer. If empty (default), write the output in the main/default visibility buffer, thereby replacing the input visibilities. Otherwise, write the output to an extra (model) data buffer in the output DPBuffer with the given name .
parallelbaselines
- type:
boolean- default:
False- doc:
Parallelize sky model prediction over baselines instead of sources. Will speed up performance in certain cases .
sourcedb
- type:
string- doc:
Path of sourcedb in which a sky model is stored (the output of makesourcedb) . When the path ends with
.skymodelor.txtDP3 expects a skymodel file as used by makesourcedb. This makes it possible to directly use a skymodel file without using makesourcedb to convert the file. The sourcedb format is described at https://www.astron.nl/lofarwiki/doku.php?id=public:user_software:documentation:makesourcedb . In DP3 v5.3 a change was introduced to fix the projection of Gaussian sources. For backward compatibility, also the old behavior is still supported, using the keyOrientationIsAbsolutein the sky model. To make sure you use the new (and most correct) behavior, addOrientationIsAbsolute=trueto your sky models .
sources
- type:
array- default:
[]- doc:
Patches to use in the predict step of the calibration .
usebeammodel
- type:
bool- default:
False- doc:
Use the beam model in the predict part of the calibration .
usechannelfreq
- type:
boolean- doc:
Same as in ApplyBeam step .