TSTEP

Determines the accuracy of each sample location within the map

Description:

The gap (in time slices if positive and seconds if negative) between full calculations of the output map bolometer positions. Setting a larger value for this will speed up the map maker but will introduce larger spatial errors. The default value of -0.5 (i.e. 100 samples at a sample rate of 200 Hz) seems to produce spatial errors of under 0.1 arc-sec. This level of errors seems to cause about 1% of bolometers samples to be pushed into a neighouring map pixel. For tstep=100, the calculation of bolometer positions speeds up by about a factor of 60. Setting tstep to 1 (or zero) causes all bolometer positions to be calculated in full, without any approximation. [-0.5]
Type:
real

SMURF Usage

MAKEMAP, CALCQU