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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
ockm
ann-
cons
ult.de
/cms/w
eb/be
am/w
elcom
e
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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
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