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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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slide2

Deep-Water Chlorophyll Images

  • common-bin 12-day composite, Winter 2002
  • 0.01-1 mg/m^3

SeaWiFS R5

MODIS/Aqua R1

slide3

OBPG Satellite Data

- MODIS Aqua (2002-present)

- MODIS Terra (2000-present)

- SeaWiFS (1997-present)

- OCTS (1996-1997)

- CZCS (1978-1986)

slide4

HDF File Format

  • 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
slide6

HDF-EOS

  • 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
slide7

MODIS Data Levels

Level 0

Level 1A

Level 1B

Level 2

Level 3 binned

Level 3 mapped

data levels flow
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
data levels flow9
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
slide10

Level 1A (HDF)

  • raw radiance counts
  • Onboard calibration data
  • navigation data
  • spacecraft telemetry
  • instrument telemetry
  • A2006027191500.L1A_LAC
slide12

Level 1B (HDF)

  • 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

slide13

Level 2 (HDF)

  • 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
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
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
slide18

L3 Binning

Level-2

After Level-2…

slide19

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

slide21

Level 3 SMI (mapped) (HDF)

  • Mapped L3 binned product
  • Data is scaled to 16-bit values
  • Equidistant cylindrical projection

A20071822007212.L3m_MO_CHLO_4

slide23

Ancillary data products

(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)
slide24

Operational MODIS Ocean Band Suite

VIS/NIR

Ocean Color

Thermal

SST

slide27

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

slide28

ODPS Data Processing System

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
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

slide30

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

slide31

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

slide32

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

slide33

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