From: "Hecht, Michael H (3820)" <michael h hecht AT jpl nasa gov>
To: Ludmilla Kolokolova
Cc: "Steele, Andrew" <asteele AT ciw edu>
Subject: One more MIDAS RID


RID: TARGET HISTORY FILES (TGH_xxx_nn).

 

Under “Filenaming Convention” the ICD indicates that the “nn” above refers
to “facet number.” The Lutetia dataset includes three TGH files, for facets
01-03. The label in all three .IMG files refer to
“ROSETTA:MIDAS_TARGET_NUMBER     = 37”

 

Problems:

·         Are “targets” and “facets” the same thing? If so, pick one term.
Preferably that term is “facets,” since the same label also includes the
keyword “TARGET_NAME  = "(21) LUTETIA", though that might mean changing the
designation “TGH.”

·         Assuming that facets and targets are the same, then the facet used
for the Lutetia observation (37) was not included in the dataset.

·         In addition to the filename designation, there should be a keyword
in the TGH LBL file indicating the facet number.

·         There is no information in TGH files indicating what segment or
coordinates were previously scanned. This is important both for change
monitoring, and in recognition of the fact that the scan itself can (and
usually does) modify the target.

·         Presumably, in addition to “Scanning” there will be fields
designating “Exposure,” or “shutter open/close.” This should be documented
in the ICD.

 

Mike

 

Michael Hecht

Senior Research Scientist

Jet Propulsion Laboratory, California Institute of Technology