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    24-Jul-2014
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MERIS Product Handbook
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The MERIS instrument
MERIS Products and Algorithms
Auxiliary Files
Common Auxiliary Datasets
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Auxiliary Datasets for Level 1b Processing
Summary of Auxiliary Datasets
Water Vapour Parameters Data File
Atmosphere Parameters Data File
Level 2 Control Parameters Data File
Aerosol Climatology Data File
Coastline/Land/Ocean Data File
Digital Roughness Model Data File
Radiometric Calibration Data File
MERIS Level 1b Control Parameters Data File
Digital Elevation Model
ECMWF Data Files
ENVISAT Orbit Data Files
Surface Confidence Map File
Land Vegetation Index Parameters Data File
Cloud Measurement Parameters Data File
Ocean II Parameters Data File
Ocean I Parameters Data File
Land Aerosols Parameters Data File
Ocean Aerosols Parameters Data File
MERIS Instrument Data File
MERIS-Specific Topics
Level 2 Products and Algorithms
Level 2 Products
Level 2 Geophysical Products
Annotation data set
Flags
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Land products
Meris Terrestrial Chlorophyll Index
Meris Global Vegetation Index
Aerosol Angström Coefficient
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Reflectance
Cloud products
Cloud reflectance
Cloud Type
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Cloud albedo
Cloud optical thickness
Ocean products
The MERIS Aerosol Angström Coefficient
Aerosol optical thickness
Photosynthetically Active Radiation (PAR)
Yellow substance
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Algal Pigment Index II
Algal Pigment Index I
Normalized water leaving radiance / reflectance
Product description
Level 2 High-Level Organisation of Products
Full Resolution Geophysical Product
Extracted Vegetation Indices
Extracted Cloud Thickness and Water Vapour for Meteo Users
Extracted Cloud Thickness and Water Vapour
Reduced Resolution Geophysical Product
Level 2 Algorithms
Level 2 Accuracies
Level 2 Algorithm Description
MERIS Level 2 Product Formatting Algorithm
Measurement Data Sets
Annotation Data Set "Tie Points Location and corresponding Auxiliary Data"
Global Annotation Data Set - Scaling Factors
Annotation Data Set "Summary Product Quality"
Specific Product Header
Main Product Header
MERIS Land Pixels Processing
MERIS Bottom Of Atmosphere Vegetation Index (BOAVI) (step 2.8)
Atmospheric correction over land (step 2.6.23)
MERIS Top Of Atmosphere Vegetation Index (TOAVI) (step 2.2)
Water Processing
MERIS Ocean Colour Processing (step 2.9)
Clear water atmospheric corrections (step 2.6.9)
Turbid water screening and corrections (steps 2.6.8, 2.6.10)
Water Confidence Checks (step 2.6.5)
Cloud Processing
Cloud type processing (step 2.4.8)
Cloud Optical Thickness processing (step 2.4.3)
Cloud Albedo processing (step 2.4.1)
Total Water Vapour Retrieval
Water vapour polynomial (function)
Range checks (steps 2.3.0, 2.3.6)
Water vapour retrieval over clouds (step 2.3.3)
Water vapour retrieval over water surfaces (steps 2.3.2, 2.3.5)
Water vapour retrieval over land surfaces (step 2.3.1)
MERIS Pixel Identification
Land Identification (step 2.6.26) and Smile Effect Correction (step 2.1.6)
Gaseous absorption corrections (step 2.6.12)
Stratospheric Aerosol Correction (step 2.1.9)
Cloud screening (steps 2.1.2, 2.1.7, 2.1.8)
MERIS Pressure Processing
Atmospheric pressure confidence tests (steps 2.1.2)
Atmospheric pressure estimate (steps 2.1.5, 2.1.12)
MERIS Pre-processing
Pre processing step
Level 1b product check
Level 2 Physical Justification
Level 1b Products and Algorithms
Level 1b product definition
Browse Products
Level 1b Essential Product Confidence Data
Level 1b Engineering Quantities
Level 1b Accuracies
Level 1b High-Level Organisation of Products
Measurement Data Sets
Annotation Data Set "Product Quality"
Annotation Data Set "Tie Points Location and corresponding Auxiliary Data"
Global Annotation Data Set
Specific Product Header
Main Product Header
Full Resolution Geolocated and Calibration TOA Radiance
Reduced Resolution Geolocated and Calibration TOA Radiance
Level 1b Algorithms
Formatting
External Data Assimilation
Pixel Classification
Geolocation
Stray Light Correction
Radiometric Processing
Saturated Pixels
Source Data Packet Extraction
Level 0 Products
Product Evolution History
Definitions and Conventions
Notations and Conventions
Product Grid
Units
Organisation of Products
MERIS product data structure
File naming convention
Acquisition identification scheme
Product identification scheme
Latency, Throughput and Data Volume
Introduction
MERIS products overview
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MERIS User Guide
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How to Use MERIS Data
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BEAM
EnviView
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How to Choose MERIS Data
Summary of Applications vs. Products
Land
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Oceans
Introduction
Special Features of MERIS
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Principles of Measurement
Scientific Background
Mission Objectives
MERIS Level 3 products
Heritage
Geophysical Measurements
MERIS Product Handbook
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2.7.2.2.7 Annotation data set

Annotation data provided in the Level 2 product are identical to those of the Level 1b product.

All annotation data will be provided at equally spaced tie points every 16 by 16 pixels in Reduced Resolution and every 64 by 64 Full Resolution pixels, which is equivalent to a 19km by 19 km grid on ground.

The following meteorological data provided by ECMWF will be resampled to the tie point grid: :

· Mean sea level atmospheric pressure

· Surface wind speed

· Relative Humidity

· Total column ozone

The following geographical information will be provided with respect to the Earth reference model WGS84:

· Latitude, Longitude

· Altitude and topographically corrected localisation

· Bathymetry

The following geometrical information will be provided with respect to the Earth reference model WGS84 :

· Solar illumination zenithal angle

· Solar illumination azimuthal angle

· Viewing zenithal angle

· Viewing azimuthal angle

The annotation data povided in the near real time products will consist of meteorological forcasts and, geographical and geometric information computed using a predicted satellite orbit state vector.

The annotation data povided in the off-line (consolidated) products will consist of meteorological analysis data and, geographical and geometric information computed using a restituted satellite orbit state vector.

For further details regarding the MERIS Level 2 data products see Product Spreadsheets.

2.8 MERIS-Specific Topics

Band Set

MERIS is operated with a fixed set of bands, recommended by the Science Advisory Group (SAG) and frozen before launch. The Level 2 ESA products have been developed and are validated for this set of bands.

It is possible to use alternative band sets for experimental campaigns of a few weeks duration. Initial requirements for such campaigns can be submitted through the Announcement of Opportunity.

Acquisition Modes

MERIS measurements are always taken in full resolution (FR). These are averaged onboard to reduced resolution (RR). RR and FR data from areas, which are not in the visibility need to be recorded onboard. The capacity of the onboard recorder for FR data is limited to 20 min.

The background mission defines which data is stored and transmitted to the receiving station. The background mission foresees that RR data is available from every location worldwide, while FR data are available from European land surfaces and all coastal areas, but not from open ocean areas. Requests for FR data can be submitted to mission planning and overwrite the background mission.

2.9 Auxiliary Files


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry