NOAA KLM User's Guide


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Introduction Page, NOAA KLM TOC, Acronyms
Previous Section, Next Section Data Set Structure

The record structure of each data set (file) as it is archived by NOAA and provided directly to near-realtime users is shown below:

Record 1: Data Set Header Record
Record 2 - EOF: Data Records

The Data Set Header Record contains information which applies to the following data records, such as data set and time identification, overall data set quality, orbital parameters, and conversion factors for calibration and telemetry data.

The Data Records contain information specific to one scan or time segment of data including time, quality, calibration, navigation, telemetry, and sensor data.

When retrospective data sets are retrieved for users from NOAA archive systems (e.g. SAA or NCDC), supplementary records are added to the data set to provide archive processing information. These data sets have the following record structure:

Record 1: Archive Retrieval System (ARS) Header Record
Record 2: Data Set Header Record
Record 3 - n: Supplementary Header Records (optional)
Record (n+1) - EOF: Data Records

The format of the ARS Header Record is the same for all data types. Although the fundamental structure of the NOAA Level 1b data set header records and data records is consistent across data types, the differences are significant, and will be addressed separately for each data type.

All the tables in this section share a common legend, which is as follows:


Field Name:

The name or brief description of the field.

Start Octet:

Offset location of first octet in the defined field from beginning of record starting with octet 1. (Note that the terms "octet" and "byte" are used interchangeably and mean the same thing.)

End Octet:

Offset location of last octet in the defined field from beginning of record.


Data Type (i - integer, u - unsigned integer, c - character). Character data is stored as ASCII.

Word Size:

Number of octets per data word.

Number of Words:

Number of words of indicated size and type contained in the defined field

Scale Factor:

Scaling Factor: x=y/10n, where x is the desired floating point value, y is the stored integer value for the defined field, and n is the number indicated in the scaling factor column for that field.


The field's unit of measurement (e.g., octets, counts, Kelvin, volts), if applicable.


References to notes that follow the format specifications.

Amended March 29, 2004

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