PDS_VERSION_ID = PDS3
LABEL_REVISION_NOTE = "
12 Nov 2002 S.McLaughlin Modified notes based on the replacement of the
original Hand Laid Mosaic Browse Facility with
the newer version of the tool found on Robinson's
NEAR website at Northwestern University.
1 Jan 2004 E. Grayzeck Text converted to tables (with labels) if wide.
"
RECORD_TYPE = STREAM
OBJECT = TEXT
NOTE = "MSI BROWSE Directory information file"
PUBLICATION_DATE = 2001-07-13
END_OBJECT = TEXT
END
***** File BROWINFO.TXT
This directory (BROWSE/) contains the two browse facilities, the MSI Hand
Laid Mosaic Browse Facility, and the MSI Sequence Browse Facility,
for the NEAR Multispectral Imager (MSI) archive. It consists of two
directory structures ('BROWSE/HANDLAID/' and 'BROWSE/SEQUENCE/',
respectively), each with an HTML table file ('time_order.htm' and
'msibrowse.htm', respectively), and the associated files for each browse
facility, stored under those subdirectory structures. The HTML and image
files are accessible to the contemporary, popular browsers.
NOTE
====
The labels and manifest tables ('manifest.tab') written for these
files and the approach used in archiving this facility make use
of prototype standards which have not yet been formally incorporated
into the PDS system. For this reason, support for this facility
within the PDS is extremely limited. Once the standards have been
fully accepted and integrated into the PDS archives, the labels and
files in this directory will be updated by the Small Bodies Node to
reflect the final version of the standard.
Structure
=========
Each browse facility consists of two parts:
1. An HTML file containing a table of MSI items, listing
parameters and links to various related images and other
files; and
2. A subdirectory structure containing the referenced files.
The image subdirectory is subdivided based on the content of
the images to be displayed. The main subdirectories and their
contents are described below.
====================================
MSI Hand Laid Mosaic Browse Facility
====================================
HTML table: BROWSE/HANDLAID/TIME_ORDER.HTM
NEAR Shoemaker - MSI Hand Laid Mosaics
--------------------------------------
Time Ordered (Hand laid Mosaics, Updated June 21, 2002)
Produced by: M. Robinson, B. Bussey, J. Edmonds, J. Lutsey, K. Moore,
L. Prockter, A. Milne, B. Wilcox, M. Malin
These mosaics are not strict cartographic products, but rather they
are hand laid "quick looks" at the asteroid. Sequences were taken by
slewing the spacecraft in a 2x2 or 3x3 (etc) pattern and images were
taken to build a larger view than possible from a single frame.
These sequences were calibrated and imported into Adobe Photoshop,
where they were mosaicked by matching overlapping features. This
required translating and sometimes rotating frames to get the best fit.
Since the spacecraft position was changing relative to the asteroid
during image acquistion, the images do not always fit perfectly.
Geometric mismatches were minimized by making irregular cut lines
between frames that skirted craters and other obvious features. The
mosaics are a great tool for studying the surface, but should not be
used to make exacting measurements.
As of November 2002, Mark Robinson continues to maintain MSI Hand laid
Mosaics. The most recently updated version of the MSI Hand laid Mosaics
Browse Facility resides on M. Robinson's NEAR website at Northwestern
University, http://www.earth.northwestern.edu/research/robinson/near.html.
This site also provides a copy of the 2002 Lunar and Planetary Science
Conference Abstract (PDS) that presents details about the mosaics.
Questions concerning the hand laid mosaics and the most recent version
of the browse facility should be directed to Mark Robinson,
1847 Sheridan Road, Evanston, IL, 60208, robinson@earth.northwestern.edu.
============================
MSI Sequence Browse Facility
============================
HTML table: BROWSE/SEQUENCE/MSIBROWSE.HTM
[The rest of this section is a copy of BROWSE/SEQUENCE/WELCOME.TXT]
INTRODUCTION
------------
Welcome to the MSI documentation browse page.
This browse facility is a website that provides an overview, sequencing
information and observational guides to the entire MSI data submission.
This site is intended to give the user of the MSI data set an overview of
what is available in terms of the raw data set. It answers the questions
of why and how we acquired these data through the mission. It does not
contain information about multiple calibration sets available for each
raw frame.
This file, welcome.txt, describes what is available in this web site, how
it is organized, AND how to use the web site. Since the data set is so
large, a complex organizational scheme was necessary to include all
of the supporting information provided here. There is a wealth of
information available, but unfortunately, some of the most useful tools
are not not obvious by just logging into the front page. For the casual
user it may not seem particularly user-friendly. For the serious user, the
extra time spent getting to understand the organization will pay off in
providing a greater understanding of and thus a greater facility with the
data set.
There are two sections in this text file:
I. ORGANIZATIONAL OVERVIEW - This thoroughly describes what is available
and how it is organized.
II. HOW TO USE THE WEBSITE - This section contains some notes about how
to best use this website.
I. ORGANIZATIONAL OVERVIEW
--------------------------
Below is an overview of the directory structure and contents. Directories
and subdirectories are shown with an underline. Listed below each directory
are the unique files, each with a brief description, as well as file
'types' and descriptions.
This top level directory has two subdirectories: 1) pre_eros, and 2) eros.
The major subdivision into 'eros' and 'pre-eros' directories was a logical
one, but also reflects the transition to using SEQGEN for sequence
building. All sequences in the 'pre-eros' section were built by hand using
STOL; everything after was done with SEQGEN and these are contained in
the 'eros' subdirectory. Organization of the ancillary files is thus
different for each subdirectory. In the pre-eros subdirectory, there are
just four subdirectories as shown that represent the major observational
events. In the eros section, the files are organized by 'sequence week'.
Throughout this period we built one sequence per week and the name of the
sequence was the last two digits of the year, plus the day of year. In
the 'eros' subdirectory there is an additional subdirectory called
'descript'. Here you will find sorted subsets of the main spreadsheet
for the different observation types.
Additional information which will help with interpretation of the following
files can be found in the /eros/eros_seq_archive.txt and
/pre_eros_seq_archive.txt files.
sequence
--------
msibrowse.htm - main page of website; contains tables with links to the
spreadsheets, and other text information files.
welcome.txt - this file; explains what is available in the sequence
directory and how to use it
observation_overview.txt - text description of all MSI activities
throughout the mission, linked from all
spreadsheets.
sequserguide.pdf - this files contains details about how these data were
sequenced; useful if user wants to interpret the
sequence files provided
pre-eros
--------
pre_eros_obsv_guide.xls - spreadsheet with description of observations;
covers time period 1996/051 to 1998/026.
pre_eros_obsv_guide.htm - spreadsheet in HTML format, linked from
front page, contains links to plots and
text files that explain the observations.
pre_eros_columns.txt - describes columns in the above spreadsheet,
linked from pre_eros spreadsheet
pre_eros_seq_archive.txt - describes in more detail what ancillary
sequence files are available and how they
are organized; also describes how to
interpret the files. This file is linked
from the main page, and from the
spreadsheet.
cruisecals_1
-----------
mathilde
--------
cruisecals_2
------------
earthmoon_flyby
---------------
>>>>>> The above four directories may contain some or all of the
following types of files:
obsv_seq.txt - text description and STOL sequence script; linked
from the spreadsheet Sequence column; referenced
from the observation_overview.txt file
obsv_name.gif - some sequence design plots are available;
linked from spreadsheet in Predict column
obsv_name.txt - a few description files are available, linked
from spreadsheet Detailed Description column
and referenced individually from the
observation_overview.txt
obsv_imagelist.txt - several imagelists are available,
referenced from observation_overview.txt
event_orbital_info.txt - trajectory information files
eros
----
The spreadsheets and html files:
a_appr_orbinsert_trns.xls......1998/210 to 2000/063
a_appr_orbinsert_trns.htm
b_200km_100km_north.xls...........2000/063 to 2000/121
b_200km_100km_north.htm
c_50kma.xls.......................2000/121 to 2000/185
c_50kma.htm
d_35kma_50kmb.xls.................2000/185 to 2000/234
d_35kma_50kmb.htm
e_100kmsouth_lowalt1.xls..........2000/234 to 2000/297
e_100kmsouth_lowalt1.htm
f_200kmsouth.xls..................2000/300 to 2000/348
f_200kmsouth.htm
g_35kmbc_lowalt2_land.xls......2000/348 to 2001/043
g_35kmbc_lowalt2_land.htm
Other files:
eros_columns.txt - describes columns in the spreadsheets, linked from
spreadsheets
eros_seq_archive.txt - describes what ancillary sequence files are
available, how they are organized and how to
interpret them; linked from main page, and from
the spreadsheets
msi_seqid_log.tab - log of when MSI sequence definitions were changed
starting on 1998/309; linked from spreadsheets
eros_orbital_info.tab - table file(s) that gives information about
spacecraft(s) range and viewing to Eros through
the orbital mission (erosflyby_orb_info for flyby);
linked from main page
descript
--------
This is an important subdirectory of ../eros that contains
description files for observation sub-types, and companion
spreadsheets that contain a sorted listing of just those
observations.
This subdirectory is NOT linked from anywhere in the
spreadsheets. However an overview file (observation_key.txt)
which lists the files is linked from front page. In addition
most of the .txt files ARE linked from the individual
observations in the Detailed Description column of the
spreadsheets. The .xls files are not linked from anywhere and
must be downloaded for use.
observation_key.txt - this is a useful file for getting an
overview the various observation types
available; gives a brief description of
the sorted files listed below.
approachmovies.xls .txt
lightcurves.xls .txt
canopuscals.xls .txt
rastertests.txt
mirrorgeom.txt
mirrorplane.txt
satsearches.txt
misc_cals.xls
global.xls .txt
globalmovies.xls .txt
featuretracks.xls .txt
flyover.xls .txt
lonscans.xls .txt
lowrobitopnavs.xls --> high orbit opnavs are listed in global.xls
opnav.txt --> description for high and low orbit opnavs
xreqs.xls .txt
color200.xls .txt
color100.xls .txt
color50km.xls .txt
color35km.xls .txt
colorflyovers.xls only
/traj
This subdirectory contains trajectory plots for the orbital
phases of the mission. There are three types of files, listed
below.
trajectory_plots.txt - describes the files contained in this
subdirectory.
traj_xxxxxxx_rtc.txt - range to center vs. time
traj_xxxxxxx_lat.txt - sub-s/c latitude vs. time
traj_xxxxxxx_rts.txt - range to surface vs. time
/loworbit
This subdirectory contains maps of the low orbit coverage
loworbit_maps.txt - this file lists the maps available with
brief description.
xreqs_xxxxx.gif - example of a map
>>>> The following subdirectories of /eros ARE linked from the
Sequence column in the 7 major Eros spreadsheets. The link will
take you to the directory itself where the files can be accessed.
Only the .gif files are linked directly from the spreadsheets
(in the Predict columns).
99201
-----
-- through --
01036
-----
>>>>> The above subdirectories may contain some or all of the
following file types:
yydoy_final_sasf.txt - sequence file for sequencing week 'yydoy'
yydoy.msi - command expansion of the above sequence for msi
with pointing
yydoy.nis - command expansion of the above sequence for nis with
pointing (the above two files are not available for
some of the early sequence weeks)
yydoy.imagelist - One line for each image, gives summary info
about each image. Only available for 98357
and all weeks after week 99340.
obsv_name.gif - One or more plots exists for most of the
observations. Some observations have none.
These ARE linked from the 'Predict' columns in
the spreadsheets. See ../eros/eros_columns.txt
for explanation.
I. HOW TO USE THIS WEB PAGE
----------------------------
The main portion of the front page of this website is dedicated to the
8 spreadsheets that collectively list each observation acquired through
the mission. Links are available directly from those spreadsheets which
can take you to description files and plots as well as the subdirectories
containing sequence files and imagelists. These will be an invaluable
resource for the user that has an overall understanding of what is
available.
Unfortunately, I have found them difficult to work with on the web page
because they are so wide and also because they take too much time to reload
after looking at the linked files. In fact, the primary reason we broke
them into the eight separate files was because some commonly available web
browsers (Netscape, for example) were incapable of loading the full
spreadsheet. I would suggest downloading the Excel versions of the
spreadsheets to your local computer. To access the the associated files
(gif plots, imagelists and so forth) from the web page, it is easiest to go
to the appropriate subdirectory and click on the files to open them up
directly. The files pop up and down more quickly this way. Manuevering
through the directories is much faster as well.
The other problem is that there is just so much data contained in the
spreadsheets that they are not a good way to get an overview of what is
available.
How to get the overview:
1) The observation_overview.txt file (linked from the main page, and also
from the top of each spreadsheet) contains a descriptive overview of
why and how all of these data were acquired. This file is also somewhat
cumbersome, but it is well organized. This file is divided into chapters
that progressively move through each time period in the mission.
Chapter 1 contains the directory contents, and lists what time period
is covered by each chapter. It also has a guide to supporting files
available. You can proceed to the chapter containing the part of the
mission of interest to you.
Each chapter has a sub-section that describes historical context, and
one that describes sequence design. In the sequence design section
you will find description of observation TYPES for that orbital phase.
Take a little time to scan through through the observation_overview.txt,
at least enough to get a feel for what was done during the different
orbital phases of the mission. This will provide a important context
for understanding what data was acquired and why. Because the viewing
geometry changed so dramatically as a function of orbital phase, the
science goals as well as observation designs varied correspondingly.
There simply was no quick way to summarize this information without
being vague and misleading.
***>>> Chapter 11 is a nice overview of the orbital mission. That is a
good place to start if you are just interested in the Eros
orbital data.
2) The second most useful way to get an overview is go to the
/eros/descript/ subdirectory and look at the file called
observation_key.txt. This file describes the contents of this
subdirectory which basically contains a set of excel spreadsheets are
are subsets of the larger spreadsheets. I have sorted out all
observations for specific catagories and put them in these
separate spreadsheets (e.g., color100.xls, approachmovies.txt,
lightcurves.txt, etc.). These .xls files are not directly linked from
anyplace on the main 7 eros spreadsheets. They must be downloaded for
use.
Also, html versions are not available.
For almost all of the spreadsheets in this directory, a companion
.txt file exists that provides a descriptive summary of the
observations. This gives a little more information about the
observations than was possible in the Brief Description column of
the spreadsheets. Most of these .txt files ARE actually LINKED from
the Detailed Description column in the 7 main eros spreadsheets for
each observation.
I expect that these will be very useful for people working with
specific data sub-types.
Good luck!
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