MODIS Ocean Processing and Data Distribution

Jasmine S. Nahorniak Mark R. Abbott

Curt Vandetta

College of Oceanic and Atmospheric Sciences

OREGON STATE UNIVERSITY

updated Feb 22 2007

Our goal:

To collect, process, and distribute MODIS oceans data off Oregon in near real-time.

Current status

• MODIS passes automatically collected day and night

• data processed to level 2 oceans within 1 hour of pass

• data processed to level 3 oceans (daily, 1 km resolution) daily

• data available online, via ftp, and by subscription

Our starting point:

• satellite dish from Apogee Solutions, Ltd.

• pass collection software• Ground Station Commander• tracker/ingest/jpl• ERSDEM2 demodulator

How do we get to level 3 oceans data from here?

photo by Tom Leach

Ancillarydata

Key: SUNPCLinux

1

2

3

12:00

13:00

GSC &browser

PC

PC passcollection

Linux

SUN

outsideusers

camera

ftpserver

webserver

database

ERSDEM2demodulator

Linux

main scripts,raw to level 3

Linux

Simulcastserver

Linux

Ancillary data

ancillarydata

1

Pass collection:

• iirv files (eph*)• tle files

Level 0 to 3 processing:

• leap seconds file (leapsec.dat)• earth motion file (utcpole.dat)• attitude and ephemeris (*ATT*, *EPH*)

Oceans processing:

• ozone data (S*.OZONE)• meteorological data (S*.MET)• Reynolds’ weekly SST (oi.mean.bias.*)

Pass collection process

2 12:00GSC &browser

PC

passcollection

Linux

camera

ERSDEM2demodulator

Linux

Pass collection issues

• regular data dropouts due to Goldstone downlinks

Raw data to level 3 processing

main scripts,raw tolevel 3

Linux

Level 3 oceans data

nLw(443) chlorophyll SST

Processing issues

• oceans code is frequently updated (but simple to update)

• oceans ancillary data availability slows processing• data are processed twice

Output for the community

3 13:00

PC

SUN

outsideusers

ftpserver

webserver

database

Simulcastserver

Linux

Data requests received

• level 1b data for fire research

• chlorophyll data during cruises

• specific regions on a regular basis

• events• earthquake• oil spill• fire

Summary

• direct broadcast system functioning well

• level 1b and 2 oceans data are available within 1 hour of the pass

• data and images are available to users online, via ftp, via subscription and through the Simulcast client.

Special thanks to:

Torben Nielsen (University of Hawaii)Scott Gennari (University of Hawaii)Dan Watanabe (University of Hawaii)Sue Walsh (RSMAS)Jim Brown (RSMAS)Bob Evans (RSMAS)Patrick Coronado (GSFC, NASA)Kelvin Brentzel (GSFC, NASA)Chris Lynnes (GSFC, NASA)Jim Dodge (NASA)Peter Baylis (Dundee Satellite Systems Ltd.)John Brush (University of Dundee)Jim Croal (Farmor Engineering Ltd.)Gene Feldman (NASA)Angie Kelley (NASA)Bryan Franz (NASA)Mike MacDonald (NASA)and many others.

Funding provided by NASA HQ.

Acknowledgments