Scan Format

The GVAR transmission sequence is depicted in Table A-1 on the adjacent page. It consists of twelve blocks numbered 0 through 11. Blocks 0 through 10 are transmitted when an Imager scan line is completed. Block 10 is followed by a variable number of block 11s (0-N) according to the data available for transmission. Block 11 (Sounder/Auxiliary Data-SAD) transmits sounder data and all non-imager data. Blocks 1 through 10 vary in length directly in accordance with the length of the imaging instrument scan line. Table A-2 on the next page provides further details about the structure of the GVAR format. In turn, Tables A-3 through A-7 further explain the GVAR block formats.

Table A-2. GVAR Scan Characteristics

Table A-3. GVAR Block 0 (Documentation Block) Format

Table A-4. GVAR Block 1 (IR1 Block) Format

Table A-5. GVAR Block 2 (IR2 Block) Format

Table A-6. GVAR Blocks 3-10 (Visible Image Data) Format

Table A-7. GVAR Block 11 Format for Sounder Scan Data