Plate.TDIMode Property

Plate.TDIMode (read-write, Boolean)

Set True to apply TDI (drift-scan) observation time corrections to objects (default = False)

Syntax

Plate.TDIMode [= Boolean]

The property syntax has these parts:

Part	Description
Value (Boolean)	Set True to apply TDI (drift-scan) observation time corrections to objects (default = False)

Remarks

Time Delay Integration (TDI, or drift-scan) images are formed by shifting the CCD data along with the motion of the image on the CCD. As a result, the time of observation of objects in the image varies across the frame. If this property is set to True, the PlateStar.ObservationTime for an object will be computed assuming the image is a drift-scan image. Likewise, the time of observation reported in the MPC report lines generated by PlateStar.MakeMPC() will also be so adjusted.

NOTE: The time correction assumes that the scan rate is correct for the declination of the image centerline, and that the exposure start time is the time at which the first row is clocked out of the imager array. Thus the exposure start time is the observation time for objects along the center row of the image.