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Introduction into MERIS data and BEAM software

Carsten Brockmann & Roland Doerffer Brockmann Consult

& Helmholtz Zentrum Geesthacht Institute of Coastal Research

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ENVISAT

Photo: ESA

MERIS

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MERIS Spectral Bands Band

Band centre (nm)

Bandwidth (nm)

Primary Use

V I S I B L E

1 412.5 10 Yellow substance and pigments detritus

2 442.5 10 Chlorophyll absorption maximum

3 490 10 Chlorophyll and other pigments

4 510 10 Suspended sediment, red tides

5 560 10 Chlorophyll absorption minimum

6 620 10 Suspended sediment

7 665 10 Chlorophyll absorption and fluo. reference

8 681.25 7.5 Chlorophyll fluorescence peak

9 708.75 10 Fluo. Reference, atmospheric corrections

I N F R A R E D

10 753.75 7.5 Vegetation, cloud

11 760.625 3.75 Oxygen absorption R-branch

12 778.75 15 Atmosphere corrections

13 865 20 Atmosphere corrections

14 885 10 Vegetation, water vapour reference

15 900 10 Water vapour, land

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MERIS daily Aquisition

1 day

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MERIS daily Aquisition

2 days

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MERIS daily Aquisition

3 days

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MERIS Products FR – 300 m

L0 – Instrument Source Packets RR – 1.2 km

L0 – Instrument Source Packets ESA internal

Dissemination to Users

Processing Tools (BEAM ODESA)

Additional Products

RR – 1.2 km L1b – TOA Radiances

RR – 1.2 km L2 – Geophysical

Parameters

Standard RR Products

FR – 300 m L1b – TOA Radiances

FR(S) – 300 m L2 – Geophysical

Parameters

Standard FR Products

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MERIS L1b Product

Top of Atmosphere Radiances

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MERIS L2 Product

Water: water leaving radiance reflectances Land: Rayleigh corrected reflectances Clouds: TOA reflectance

Water Products

Land Products

Cloud Products

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Vegetation Index Algal / chlorophyll Cloud Top Pressure

MERIS Level 2 Products

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Flags/ bitmap overlay •  Land, water, cloud flag Level 2 pixel identification •  Science flags •  Invalid flags

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•  Invalid Flag •  Science Flag

Algal 1: all values Algal 1: only valid values (invalid flag is set)

Flags/ bitmap overlay

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Contents of Products •  Bands

–  contains all measured spectral/geophysical and quality raster datasets of a product (mandatory)

•  Tie-point grids –  contains all tie-point grid raster datasets (16x16 RR Pixels)

•  Flag Codings –  contains flag coding metadata for quality flags datasets

•  Metadata –  contains additional metadata

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Data Availablilty and Access •  RR

–  Rolling Archiv (most recent data, 7 days) –  ESA-MERCI (Archiv)

•  FR(S) –  Rolling Archiv (most recent data, 7 days) –  EOLI-SA (Archiv)

•  Access: –  Rolling Archiv RR: Cat-1 Fast Registration –  ESA-Merci: Cat-1 Fast Registration –  Rolling Archiv FR: Cat-1 Fast Registration –  EOLI-SA: Cat-1 proposal

•  Costs: –  FTP: 0€ –  DVD: 10€ (cost of reproduction)

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(1) Registration

http://eopi.esa.int

Data Availability and Access

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Data Availability and Access – MERIS RR

(1) Registration

http://merci-srv.eo.esa.int

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BEAM in a Nutshell •  BEAM is a tool for the exploitation of optical data

–  VISAT Visualisation and Analysis Tool –  > 30 Data Processors –  SMOSBox, Globtoolbox, ChrisBox –  NEST built on BEAM API

•  BEAM is an open source Java platform for the development of remote sensing applications

–  Java API, Graph Processing Framework –  User support: Plug-Ins, Issue tracker, Community Wiki –  Supported by ESA, started 2002

•  Free available from –  envisat.esa.int/beam or www.brockmann-consult.de/beam

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History of BEAM •  Started 2002 •  Originally designed for displaying, analysing and processing MERIS and

AATSR products –  special focus on validation applications –  Special focus on water products

•  No replacement of standard remote sensing software –  e.g. ENVI or Erdas Imagine

•  User driven evolution –  Experimental processors

•  Some processors operationally in use •  Incl. land products processors

–  Growing set of functions for image analysis •  clustering, spectral unmixing

–  Growing support of products and formats •  e.g. high resolution sensors like ALOS-AVNIR, CRIS PROBA •  geoTIFF

–  Re-design of image handling for supporting large images •  Image tiling, pyramids

•  Current version: 4.9.0.1 (16.05.2011)

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Supported Data Products and Formats

+ generic image formats: GeoTIFF, netCDF

+ all ESA DUE Globproducts (e.g. Globcolour, CoastColour)

+ SMOS

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Installation & Update •  Download of BEAM Installation file

–  http://www.brockmann-consult.de/cms/web/beam/software

•  Directories –  Directories installed during installation

•  <Beamhome> •  <Beamhome>\modules •  <Userhome>\.beam

–  Preferences •  <Userhome

•  Module Manager –  BEAM is build in modules which can be added and updated individually –  Installation of new processors –  VISAT Help Module Manager

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BEAM Website

www.br

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Toolbox •  VISAT

–  Interactive data visualisation and analysis tool –  Scripting console (Python, Java Script)

•  GPT –  Batch-mode processing of all scientific data processors

•  C-API –  C-library for easy access to N1 format

•  Java-API –  Full access to all BEAM classes –  Graph Processing Framework (GPF) use BEAM expand BEAM

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Products View

Image View

Navigation

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Image View

Navigation

Pixel Info