PDS LDN Data Review
7 December 2007
Review Summary


Apollo 15 and 16 X-Ray Flourescence Spectrometer

Reviewers - Ann Parsons (present), Pam Clark (not present, sent comments)

The normal data mode is listed as 14 in the dataset.cat and label files,
should be 16. Update files.

Label files - units should be raw counts not KeV, fix unit keyword

In the Apollo 16 catalog there is a .rpt file - delete this

Apollo 15, 16 catinfo.txt, Apollo 16 calibration.lbl - line terminator
errors - fix these

List the original data sources used for this data set (magnetic tapes
and digital tables) and describe any processing to get to PDS data.

The instrument alternated between normal and extended mode, there are
separate tables for the two modes, so it appears that there are data
gaps when it is in the other mode.  Make a note of this switching so as
not to confuse users, explain in dataset.cat file.

There are also real data gaps due to the instruments being turned off
for various reasons, note that the instrument was turned off and give
the data gaps explicitly, either by orbit number they occur in or the
time span they cover. (Pam has listed orbits for both Apollos. Ann has
time spans for Apollo 16)

At the entrance to and/or exit from calibration mode there appears to be
some "contamination" of the data point immediately before or after
calibration mode starts.  Need to talk to Mike Bielefeld for more detail
on this. This should be noted so those points can be treated properly by
researchers.

How was the subspacecraft latitude and longitude calculated?  What
reference frame was used? (talk to Pam C. or Jeff P.) How are pitch,
roll, and yaw referenced?  Do we have diagrams or other information on
this we can add to the documentation?  Supposedly coordinate frame is in
PSRs.  Note that subspacecraft longitude and latitude were merged into
the science data long ago.

There is more calibration information available from Mike Bielefeld, on
the beryllium window, the point-spread function, etc.

What was the thickness and transmission characteristics of the extra Be
window used on Apollo 16?  Mike Bielefeld may have this information, add
in to dataset.cat if possible

Mike also has data from Solrad 9 and 10 taken at the time of the X-ray
measurements which could be useful since the state of the solar flux is
needed to accurately model the X-ray return.  These could be put in an
"Extras' directory as a supplement to the solar monitor data (Apollo 15
solar monitor was saturated and data were mostly useless).

Include a copy of the relevant Apollo Preliminary Science Report with
the data set.

Talk to reviewers about adding more documentation

Add notes on spatial resolution at surface - may already be in
instrument.cat, can also add to dataset.cat

Should we include Mike Bielefeld's fortran software that he used to
process the data?