FY-2 CSV File Format Specification Version 2.0
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1. FY-2 data archiving format CSV CSV is a format developed by the National Satellite Meteorological Center to archive S-VISSR data. Built on S-VISSR data, CSV data, when quality controlled, can generate CSV data files and CSV quality files. A CSV data file contains both extracted S-VISSR metadata and quality controlled S-VISSR data. The data would be stored in a compressed manner. A CSV quality file contains the quality information on quality control generation.
1.1 Compressed S-VISSR (CSV) data files
1) Composition In a CSV file, each record is defined with a length up to 330,080 bits, or 41,260 bytes. A global imagery may have 2,501 records. The first record contains metadata (Table 4.20), with others having compressed S-VISSR data.
In addition to the two-byte record number and the 1-byte quality code, each S-VISSR data record has a file segment (DOC), 4 infrared imagery data segments (IR1-IR4) and 4 visible imagery data segments (VIS1-VIS4). The composition of CSV files is given in Table 4.19.