TABLE OF CONTENTS
MBARI SATELLITE SYSTEM *
Updating the SeaWiFS encryption key *
Changing Backup Tapes for the Satellite System *
Writing Unarchived Passes to Tape *
TABLE OF FIGURES
Figure 1 Locating the new encryption page using the internet.
Figure 2 MBARI's encryption code is denoted by the site
code of HMBR *
Figure 3 Diagram of the 'black box' , used for setting
the encryption key *
Figure 4 Output from the command 'run lsall' Archived
passes are denoted by the off-line status. In this example the pass obv2
98087073821 was not archived. The alpha string at the beginning of the
line denotes the type of satellite, noac is NOAA 12, noae is NOAA 14, the
second field is a numeric string containing YYDDDDHHMMSS. *
Figure 5 Output from the command 'run tailhda' *
MBARI SATELLITE SYSTEM
This document describes some of the maintenance tasks for the MBARI
satellite system, primarily the encryption key process and the archiving
As of March 1998, the MBARI Global Imaging Satellite System, is currently
loaded on the workstation foam, which is located in the Communications
room. This room is accessible by the MBARI card-key. If you need access
privileges added to your card-key, please see facilities (Charlene Smith
or Monty Perry). Foams console sits on top of the Silicon Graphics workstation
crimson, which is the first computer set up you will see
upon entering the communications room. Foams console should be displaying
4 windows, each window represents one of the satellite imaging processes:
HRPTDI (data ingestion), HRPTPG (product generation), HRPTPD (product distribution,
HRPTDS (data stream).
Francisco Chavez is the P.I. for the Satellite Project. MBARI began
using the satellite system in 1994. Tom OReilly, who has since moved to
the Engineering Department, was hired to setup and process the satellite
data. Tom set up both the AVHRR and SeaWIFs systems. The MBARI Satellite
system is made up of several workstations, figure 1. The Telonics system
captures the passes. Foam, to a certain extent, processes the passes. Further
processing of the SeaWIFs data is carried out on lepas.
Until April 1998, Steve Lowder had been taking care of the archiving
of the Satellite AVHRR data. This task has been assigned to Reiko
Both the AVHRR and SeaWIFs images are available on the internet.
More to come...
Updating the SeaWiFS encryption
The SeaWiFS encryption key is changed every two weeks. The key is published
on the web.
Changing Backup Tapes for the
Obtain the new key from the orbi webpage: http://www.orbimage.com/keys/keys/
Select the date range applying to the current date. In the example below
the range was selected on March 24, as such the Mar25-Apr7 key was selected.
Figure 1 Locating
the new encryption page using the internet.
Find MBARIs new key under the code HMBR. It is a good idea to print this
page and take it to the communications room. A notebook holds the previous
Figure 2 MBARI's encryption
code is denoted by the site code of HMBR
In the Communications Room, under the Foam console, is the black box.
On the front panel, to the right there is an alpha-numeric key pad. First
hit the key CMD. This will bring up a menu on the lcd window on the left
side of the box.
Figure 3 Diagram of
the 'black box' , used for setting the encryption key
Using the key DN, scroll through the menu until you find the Set
KeyID selection. Select using the ENT key.
Type in the new MBARI key acquired in step 2, in the example above the
new MBARI key is: 4e91913984db0962. Hit the ENT key. The program will request
you type in the key again for validation. Hit the ENT key to finish.
Using the DN key scroll to Set Real Time Mode.
Satellite passes are archived to DAT tape (90 meter DDS-1 data cartridges).
While TSD does have spare DAT tapes, it is our responsibility to order
tapes. One DAT tape will record approximately 3.5 days of data. If the
DAT tape fills before you are able to replace the tape, the system will
buffer the unarchived passes. However, you must manually write the unarchived
passes to tape. See section below.
Writing Unarchived Passes to
Log on to foam using the user name HRPT. This user account is not password
protected and will not request a password. To view the schedule of passes
type in : run lsall . This will show which passes were archived
and which passes were not archived. Archived passes are denoted by the
off-line status. Please see next section for archiving passes manually.
Figure 4 Output from
the command 'run lsall' Archived passes are denoted by the off-line status.
In this example the pass obv2 98087073821 was not archived. The alpha string
at the beginning of the line denotes the type of satellite, noac is NOAA
12, noae is NOAA 14, the second field is a numeric string containing YYDDDDHHMMSS.
To view the end of the tape catalog type in: run tailhda. The third
column shows the number of passes. The first field is as described for
the run lsall command. While you may login to foam from any workstation
you must go to the communications room to remove the old tape which is
on the workstation foam. To remove the tape press the square button below
and to the right of the DAT tape drive. Insert the new DAT tape; the lights
beneath the tape drive will blink for a couple of minutes. When the light
stops blinking the tape is ready to write.
Figure 5 Output from
the command 'run tailhda'
To initialize the new tape type in: run newhda.
The system has the ability to buffer passes that have not been archived.
This is a time consuming process and should be avoided if possible. To
perform this process one must be logged on to foam as user
View the unarchived passes using the command, run lsall, see figure
4. The passes that have not been written to tape have the on-line status,
but not the off-line status. The second column contains the pass ID,
an 11 digit numeric code. This code is used to tell the system which pass
At the command line, type in the following command, substituting the numeric
pass ID for <passID>. Type the command, run archive pass=<passID>.
As an example, using figure 4 , we see that pass ID 98087073821 was not
archived. We would use the command, run archive pass=98087073821
to archive this pass. Each pass takes approximately 15-20 minutes to write