NOAA logo with flying seagull.

NOAA KLM User's Guide

Section 6.0
Blue line drawn across page to separate text from document title.
Image denotes media you're currently using--Web or CD.Introduction Page, NOAA KLM TOC, Acronyms
Previous Section, Next Section

6.0 Ingest and Pre-Processing

Operation of the various satellite data processing systems is principally the responsibility of NOAA/NESDIS' Information Processing Division (IPD). Data are ingested into IPD's Central Environmental Satellite Computer System (CEMSCS) from the Satellite Operations and Control Center (SOCC) and from the Shared Processing Network (SPN). The CEMSCS has ingest and preprocessing systems for Polar, Geostationary and Shared Processing. The system described in this document is most relevant to the CEMSCS Polar Data Processing System (PDPS). The PDPS operation consists of components such as pre-launch activities, ingest, pre-processing, calibration, navigation, product generation and archive. Figure 6.0-1 shows the general flow of the polar data through the PDPS system.

Figure showing polar data processing flow

NOAA's data levels are defined as follows:

  • Level 0 - Unprocessed telemetry data as received from the observing platform excluding communications artifacts introduced by the ground system.

  • Level 1a - Telemetry data that have been extracted but not decommutated from Level 0 and formatted into time-sequenced data sets for easier processing. The Level 1a formats are NOAA's internal formats and are only used for NOAA processing. They only exist briefly for the purpose of creating the Level 1b datasets.

  • Level 1b - Discrete, instrument-specific data sets derived from Level 1a containing unprocessed data at full resolution, time-referenced, and annotated with ancillary information including data quality indicators, calibration coefficients and georeferencing parameters.

    • The software systems that are implemented, operated and maintained, are in the following functional categories: Ingest (Level 1a), satellite dataset processing (Pre-Processing Level 1b), product processing, archiving, QC-monitoring, navigation and earth-location, data communications, calibration (pre- and post-launch) and Shared Processing.

    Amended November 7, 2001

    Previous Section Top of Page Next Section