2.2 Organisation of Products
2.2.1 File naming convention
2.2.1.1 Product identification scheme
As detailed in the “Envisat-1 Products Specifications - Volume 4 – Product overview” document ( R-6), MERIS products are identified according to the following syntax:
MER_XXX_YZ
where
· XXX is the mode (when relevant) or contains letters used to differentiate between several products created at the same processing level (e.g., several Level 2 products. Unused letters are replaced by underscore characters. These codes are instrument specific.
· Y is the product level code:
- 0: Level 0,
- 1: Level 1B,
- 2: Level 2,
- B: Browse
· Z indicates whether the product is a Parent (also called segment for MERIS acquisition) or Child (extracted) product:
- P : Parent Product
- C : Child Product
As listed below, all the MERIS products obey the above syntax.
Table 2.2 - MERIS product names.
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MER_CA__0P
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MERIS Level 0 Calibration (all calibration modes)
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MER_RR__0P
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MERIS Level 0 Reduced Resolution
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MER_RR__1P
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Reduced Resolution Geolocated and Calibrated TOA Radiance (stripline)
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MER_RR__2P
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Reduced Resolution Geophysical Product for Ocean, Land and Atmosphere (stripline)
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MER_LRC_2P
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Extracted Cloud Thickness and Water Vapour for Meteo users. Level 2 Product generated from MER_RR__2P (Cloud thickness and water vapour content for the Meteo at reduced resolution > 5 km) (stripline)
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MER_RRC_2P
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Extracted Cloud Thickness and Water Vapour (non-Meteo users). Level 2 product extracted from MER_RR__2P (Cloud thickness and water vapour content at nominal RR resolution) for NRT distribution (stripline)
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MER_RRV_2P
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Extracted Vegetation Indices. Level 2 product extracted from MER_RR__2P (Vegetation indices including atmospheric corrections for selected land regions) for NRT distribution (stripline)
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MER_RR__BP
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Browse (covers FR and RR requirements) (stripline)
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MER_FR__0P
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MERIS Level 0 Full Resolution
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MER_FR__1P
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Full Resolution Geolocated and Calibrated TOA Radiance
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MER_FR__2P
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Full Resolution Geophysical Product for Ocean, Land
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2.2.1.2 Acquisition identification scheme
As detailed in the “Envisat-1 Products Specifications – Annex A – Product data conventions” document (where
· p is processing stage flag :
- N: Near Real Time product,
- V : fully validated (consolidated) product,
- T : test product,
- S : special product.
· GGG identifies the center which generated the file:
- PDK = PDHS-K
- PDE = PDHS-E
- IEC = IECF
- LRA = LRAC
- PDC = PDCC
- FOS = FOS-ES
- PDA = PDAS-F
- PAM = Matera for NRT production
- UPA = UK-PAC
- DPA = D-PAC
- IPA = I-PAC
- FPA = F-PAC
- SPA = S-PAC
- EPA = E-PAC
- ECM = ECMWF
- ACR = ACRI
- FIN = FINPAC
· yyyymmdd is the start day of the acquisition,
· HHMMSS is the start time of the acquisition,
· tttttttt is the duration (in seconds) of the acquisition,
· P identifies the phase of the mission,
· ccc is the number of the cycle in the mission phase_,
· OOOOO is the relative orbit number within the cycle,
· aaaaa is the absolute orbit number,
· QQQQ is a numerical wrap-around counter for quick file identification. For a given product type the counter is incremented by 1 for each new product generated by the product originator.
· SS identifies the satellite (E1 = ERS-1, E2 = ERS-2, N1 = ENVISAT-1).
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