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Satellite Data Provided by the NASA Ocean Biology Processing Group (OBPG)
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Satellite Data Provided by the NASA Ocean Biology Processing Group (OBPG). Deep-Water Chlorophyll Images common-bin 12-day composite, Winter 2002. 0.01-1 mg/m^3. SeaWiFS R5. MODIS/Aqua R1. OBPG Satellite Data. - MODIS Aqua (2002-present) - MODIS Terra (2000-present)
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Satellite Data Provided by the NASA Ocean Biology Processing Group (OBPG)
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- common-bin 12-day composite, Winter 2002
- 0.01-1 mg/m^3
SeaWiFS R5
MODIS/Aqua R1
- MODIS Aqua (2002-present)
- MODIS Terra (2000-present)
- SeaWiFS (1997-present)
- OCTS (1996-1997)
- CZCS (1978-1986)
- Hierarchical Data Format (HDF) is a data file format
- OBPG data files stored as HDF (L1A, L1B, L2, L3)
- HDF can be thought of as a “container” to store a variety of data types and meta data in a single file
- OBPG files stored in HDF-EOS format:
- specialized form of HDF
- created by NASA in 1993
- standard format for all EOS data
- SeaDAS is compatible with OBPG HDF-EOS
Level 0
raw digital counts
native binary format
Level 1A
raw digital counts
HDF formatted
Data Levels & Flow- ATT & EPH
- spacecraft attitude
- spacecraft position
- GEO
- geolocation
- radiant path geometry
- Level 1B
- calibrated reflectances
- converted telemetry
- Ancillary data
- wind speed
- surface pressure
- total ozone
- Reynolds SST
- Level 2
- geolocated geophysical products for each pixel
Level 0
raw digital counts
native binary format
Level 1A
raw digital counts
HDF formatted
Data Levels & Flow- ATT & EPH
- spacecraft attitude
- spacecraft position
- GEO
- geolocation
- radiant path geometry
- Level 1A Subset
- reduced to standard ocean bands only
- Level 1B
- calibrated reflectances
- converted telemetry
- Ancillary data
- wind speed
- surface pressure
- total ozone
- Reynolds SST
- Level 2
- geolocated geophysical products for each pixel
- raw radiance counts
- Onboard calibration data
- navigation data
- spacecraft telemetry
- instrument telemetry
- A2006027191500.L1A_LAC
- calibrated, geolocated at-aperture radiances
i.e. Top of Atmosphere (TOA) radiances
- quality flags
- error estimates
- calibration data
A2006027191500.L1B_LAC
A2006027191500.L1B_HKM
A2006027191500.L1B_QKM
- geophysical values for each pixel
- products include chlorophyll-a, SST, nLw’s, K490, flags
- geolocation data
A2006027191500.L2_LAC
A2006027191500.L2_LAC_SST
A2006027191500.L2_LAC_SST4
Level 2 Standard MODIS Ocean Products
- Ocean Color (day only)
- Normalized water-leaving radiances - nLw()
- Chlorophyll - Ca
- Diffuse attenuation - Kd(490)
- Aerosol type and concentration
- Optical thickness - a
- Ångström exponent
- Atmospheric epsilon
- Processing flags
- Cloud, land, glint, atmfail, atmwarn, chlfail, chlwarn, etc.
- Ocean Temperature
- Long-wave SST (11-12 m) (day and night)
- Short-wave SST (3.9 - 4.0 m) (night only)
- SST quality level (0-4)
Level 2 Non-standard Ocean Products
- Ocean Color
- Alternate Ca and Kd algorithms
- Chlorophyll fluorescence, FLH
- Particulate inorganic carbon, Calcite
- Inherent optical properties (various bio-optical models)
- absorption (total, phaeophytin, dissolved matter)
- backscatter (total, particulate)
- Photosynthetically active radiation, iPAR, PAR (coming)
- Euphotic depth (Zeu, Zsd)
- Subsurface PAR at 1st optical depth, Kd(PAR)
- Intermediate atmospheric correction products
- Ocean Temperature
- Brightness temperatures
Level 3 Binned data products (HDF)
- data composites
- binned Level 2 data (spatially and temporally)
- arithmetic means with statistics for each bin
- daily, 8-day, monthly, yearly periods
- 0.5, 1, 2, 4, 9, 36 km2 resolutions
- stored as one file or a main file with subordinates
- useful for scientific research
A20071822007212.L3b_MO.main
- Mapped L3 binned product
- Data is scaled to 16-bit values
- Equidistant cylindrical projection
A20071822007212.L3m_MO_CHLO_4
(HDF and other formats)
- NRT data and refined ancillary data
- used in various stages of processing:
- Geolocation (attitude and ephemeris)
- Calibration (coefficient look-up tables)
- atmospheric correction (MET/OZONE/SST)
Operational MODIS-Aqua Data Flow
NASA EDOS
System
Software process
April 1, 2014
Hardware system
Database table
NOAA Realtime
System
Ancillary input data
User
Community
MET
Full-resolution day- and nighttime via SEN (~60 GB per day)
MET, Ozone, and OISST data are dynamically selected for each L1A granule
Ozone
MODISA L2
table
Level-0
Ingest
L1B-L2
(MSl12)
Ocean Color
Web Server
OISST
Archive - Distrib
Server
Sensor
CAL
L1A-L1B
(MOD_PR02)
Ingest queue
table
Sensor
attribs
Browser
CGI /
httpd
MODISA L3-bin
table
L3BIN
(l2bin)
Atm
corr
Archive - Distrib
Server
ATT/EPH
Ingest
process
Archive - Distrib
Server
MySQL
DB
Geo-Location
(MOD_PR03)
MODISA atteph
table
MODISA L3-map
table
Product meta data are populated from production DB
L3MAP
(smigen)
Archive - Distrib
Server
L0
Ingest
process
Archive - Distrib
Server
Archive - Distrib
Server
L0-L1A
(MOD_PR01)
MODISA L0
table
MODISA L1
table
Current Components
Distribution Servers (ftp)
6 storage nodes
7.2 TB
Distribution Servers (web)1 large server – 3 TB
58 storage nodes
69.6 TB
Ingest Servers
2 SeaSpace groundstations
5 storage nodes
6 TB
Cal/Val & QC Systems
Processing Cluster 34 processing nodes 1.5 TB
Extreme Networks
Black Diamond 6816
Gigabit Ethernet switch
Mission Operations Systems
Database Server
1 large server
876 GB
Development Servers
1 processing node
2 storage nodes
2.4 TB
Testing Cluster
13 test nodes
2 TB
Backup Servers
1 large server
876 GB+2 TB tape
5 storage nodes
6 TB
User Desktops
Network Support Systems
Data Processing and Storage
gigabit ethernet
- database controlled, distributed processing and storage system
- many Linux-based, processing nodes (34 dual 3GHz Xeon)
- 200X processing for MODIS/Aqua ocean color
- 4000X processing through-put for SeaWiFS ocean color
- 9-month OCTS mission can be reprocessed over lunch
- all data online for direct access (100TB RAID-5 array)
- capacity for global mission testing prior to reprocessing, allowing opportunity for community participation in reprocessing decisions
- direct and near real-time user access to data archives
database server
processing node
storage node
Ocean Biology Data Processing System - Processing Node
Supermicro 6024 rack mount server
2 Intel Xeon CPUs 3.06 Ghz
8 1 GB DDR2 RAM modules
2 Intel Gigabit Ethernet network interfaces
1 Seagate 80 GB EIDE disk (system)
5 Maxtor 73.4 GB Atlas 10K IV Ultra320
SCSI disks (processing)
1 CD-ROM (low profile)
1 Supermicro X5DP8-G2 motherboard with
built-in Ultra320 SCSI controller
1 Supermicro 6024H 2U rack mount server case
with dual power supplies
Operating system: Linux
Ocean Biology Data Processing System - Storage Node
NAS 1.2 TB rack mount server
1 Intel Pentium-4 CPU 3.06 Ghz
2 512 MB DDR2 RAM modules
1 Gigabit Ethernet network interface
1 Seagate 80 GB EIDE disk (system)
8 Maxtor 250 GB MaxLine Plus II EIDE disks
(RAID 5, 6 data + 2 hot spares)
1 CD-ROM (low profile)
1 Asus P4C800-E Motherboard
1 3ware Escalade RAID controller for 8 drives
1 Comix Computer RM-3U9SCA (IDE) ATX
rackmount chassis 3 U, 9 hot swappable
drive bays
Operating system: Linux
Ocean Biology Data Processing System - Large Server
SunFire V880 rack mounted
4-8 UltraSPARC-III+ processors
8-16 GB RAM
6-12 73 GB 10K RPM FibreChannel disks
2 Gigabit Ethernet nework interfaces
1-5 Fast Ethernet network interfaces
1 External FibreChannel adapter
Operating system: Solaris
Ocean Biology Data Processing System - Network Switch
Extreme Networks Black Diamond 6816
768 Gbps total switching capacity
Route/filter/forward 192 million pps
160 GigE ports in current configuration
All modules are hot swappable
4 MSM management modules
2 G8Ti 8 port Gigabit Ethernet modules
6 G24T3 24 port Gigabit Ethernet modules
4 Hot-swappable power supplies
