TIP data

TIP (TIROS-N Information Processor) data is extracted from the AVHRR, GAC and LAC data described in the previous section. TIP data also contains information received from the MSU (Microwave Sounding Unit), the HIRS (High Resolution Infrared Sounder), and the SSU (Stratospheric Sounding Unit). These three sources measure incoming radiation in the infrared and microwave spectrum.

The navigation block for TIP data is filled with zeros; no calibration information is needed.

TIP directory block

Word	Value	Description
14	1
19	1	band map value
49	196	length of the line prefix documentation
50	0	length of the line prefix calibration
51	0	line prefix band list
52	TIRO	image source type; 4 bytes ASCII
53	RAW	calibration type; 4 bytes ASCII

TIP data block

TIP data is transmitted as 10 bits and stored as 16 bits. The 10-bit data is formatted as follows, with x representing a data bit and the rest being zero-filled after shifting:

| 0 | x | x | x | x | x | x | x | x | x | x | 0 | 0 | 0 | 0 | 0 |

The line prefix for the data block contains the information below.

Region	Description
validity code	optional, but recommended to flag missing data, which requires zeros as placeholder data or a validity code that does not match the value in the area directory
documentation	196-byte DOC section from the signal transmission
calibration	0 bytes; not needed for TIP data
band list	0 bytes; not needed for TIP data

For a complete description of the line documentation fields, see NOAA Technical Memorandum NESS 107, 1988. The band information for TIP data is provided in this manual in Appendix B, Satellite Information.

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