Speeds up convergences and reduces ringing by excluding sources within a region
specified by an external mask file from the filtering performed by the FLT model FLT.ZERO_MASK
"
REF"
, "
MASK2"
or "
MASK3"
then an NDF will be obtained using the specified
ADAM parameter (REF, MASK2 or MASK3) and used as a user-defined mask. Setting flt.zero_mask to an
integer value larger than zero has the same effect as setting it to "
REF"
. Setting it to an integer less than or
equal to zero results in no external mask being used with the COM model. Note, using "
REF"
ensures that
the mask and the output image of MAKEMAP are on the same pixel grid - using "
MASK2"
or
"
MASK3"
does not provide this guarantee (it is then the users responsibility to ensure that the
supplied masks are aligned with the output image in pixel coordinates). The pixels in the map that
are to be included in filtering performed by the FLT model should be set to the bad value in the
mask. All other pixels will be excluded from the filtering (i.e. they will be replaced by artifical data
interpolated from the adjacent data). The mask for the first iteration can be set separately using
parameter "
flt.zero_mask0"
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