Algal Pigment Concentration
The algal pigment concentration can be derived from two algorithms: OC4ME and Neural Network (see dedicated processing section). Each of the derived concentrations is included in a specific file : chl_oc4me.nc and chl_nn.nc, respectively.
The following table provides the main characteristics of these variables including coverage, parameter ID, time latency, sampling and bands used in the associated product. The ancillary and auxiliary data provides the variables used during processing and are provided in Auxiliary Data Files (ADFs).
| PRODUCT NAME | Algal Pigment Concentration |
| PARAMETER ID | CHL_OC4Me, CHL_NN. _OC4Me (_NN refer to the originating algorithm). |
| PRODUCT LEVEL | 2 |
| DESCRIPTION | Chlorophyll-a concentration and associated error estimates. |
| PRODUCT PARAMETERS | |
| COVERAGE | global |
| PACKAGING | half-orbit |
| LATENCY | NRT, NTC |
| UNITS | mg (chl a) m-3 |
| RANGE | 0.01 - 100 mg m-3 (0.01 - 30 when restricting to Case 1 waters) |
| SAMPLING | Spatial: approximately 300 m x 300 m (FR) and 1.2 km x 1.2 km ; spectral: N/A |
| FORMAT | 1-byte integer |
| APPENDED DATA | Error estimate (1-byte integer) |
| FREQUENCY | 1 product per orbit |
| SIZE OF PRODUCT | Approx. 0.54 GB (FR), 35 MB (RR) |
| ADDITIONAL INFORMATION | |
| INPUT BANDS | OC4Me: Oa3 (443 nm) to Oa6 (560 nm) NN: Oa1 (400 nm) - Oa12 (753.5 nm), Oa16 (778.75 nm), Oa17 (865 nm), Oa21 (1020 nm) |
| ANCILLARY AND AUXILIARY DATA | OC4Me: Pre-computed f/Q tables, R table, Chl polynomial coefficients NN : Neural net coefficients LUT |