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Satellite's Eye Art Gallery Educational Topics

Explanation of "Image Information" Tables


Refer to Links Below for Explanations
Satellite System Image Specifics
Satellite Name GOES 7 Channel Band No. 4 (Infrared)
Date Date and Year Resolution 4-km
Julian Date 237 Orbit No./Dir NA
Time 0831 UTC
0431 EDT
Entity ID NA
Instrument System VAS Area Geographical Description
Data Type Sector


Satellite Name

    There are three primary meteorological satellite systems used by the US:
    1. NOAA Polar Orbiting Environmental Satellites (POES)
    2. Geostationary Operational Environmental Satellites (GOES)
    3. Defense Meteorological Satellite Program (DMSP) satellites
    The POES and GOES satellites are given numbers when they become operational. Operational satellites as of September, 2001 are NOAA-12, NOAA-14, and NOAA-16 (POES); GOES-8 and GOES-10; and DMSP F-12, F-13, F-14, and F-15.


Julian Date

    Modified Julian dates are sequential numbers of the days of the year (using GMT time) beginning with January 1. From year to year, the Julian dates are the same for the same calendar dates, with the exception of leap years when one digit needs to be added for all days past February 29.


Time

    Times are given in "Coordinated Universal Time" (UTC). These times are the same at any given instant over the entire world. For major U.S. time zones: UTC = EST + 5 hours, UTC = CST + 6 hours, UTC = MST + 7 hours, and UTC = PST + 8 hours.


Instrument System

    AVHRR: Advanced Very High Resolution Radiometer (POES data)
    VISSR: Visible and Infrared Spin Scan Radiometer (GOES 1-3 data)
    VAS: VISSR / Atmospheric Sounder instrument (GOES 4-7 data)
    Imager: Imaging instrument (GOES 8-10)


Data Type

  • POES:
    LAC: Local Area Coverage: Recorded HRPT AVHRR: 1-km Resolution data
    GAC: Global Area Coverage: Reduced Resolution Recorded AVHRR: 4-km Resolution data

  • GOES:
    Sector: Image data at resolutions ranging from 1-km to 8-km depending upon channel selection and satellite.


Channel Band

  • GOES 7:
    • Channel 1: 0.55 - 0.75 microns
    • Channel 2: 3.84 - 4.06
    • Channel 3: 6.40 - 7.08
    • Channel 4: 10.2 - 12.0
    • Channel 5: 12.5 - 12.8

  • GOES 8/9/10:
    • Channel 1: 0.52 - 0.72 microns / Visible
    • Channel 2: 3.78 - 4.03 microns / Short Infrared Window
    • Channel 3: 6.47 - 7.02 microns / Water Vapor Channel
    • Channel 4: 10.2 - 11.2 microns / Longwave Infrared Window
    • Channel 5: 11.5 - 12.5 microns / Split Window

  • NOAA 12/14/16:
    • Channel 1: 0.58 - 0.68 microns / Visible
    • Channel 2: 0.725 - 1.10
    • Channel 3: 3.55 - 3.93
    • Channel 4: 10.3 - 11.3 microns / Longwave Infrared
    • Channel 5: 11.5 - 12.5


Resolution

  • GOES 7:
    • Channel 1: 1-km
    • Channels 2, 3, and 5: 14-km
    • Channel 4: 7-km

  • GOES 8/9/10:
    • Channel 1: 1-km
    • Channels 2, 4, and 5: 4-km
    • Channel 3: 8-km

  • NOAA 12/14/16:
    • LAC : All channels: 1.1-km at satellite's nadir
    • GAC : All Channels: 4-km resolution (reduced by sampling and averaging techniques)


Orbit Number

    Orbit numbers are used with POES satellites. For data acquired outside the Satellite Active Archive, the number provides specifics for acquiring POES data.


Entity ID: CCSSMMDDYYTTTTTT

    The Entity ID is a 16 character code given to all satellite scenes derived from the Satellite Active Archive (SAA).

    • CC = AH, AL, or AG

      AH (HRPT): High Resolution Picture Transmission / Direct Readout AVHRR
      AL (LAC): Recorded HRPT AVHRR
      AG (GAC): Reduced Resolution Recorded AVHRR

    • SS = Satellite Number (12, 14, or 16 for POES)

    • MMDDYY = Month, Day, and Year

    • TTTT = Start time of the scene (UTC)


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Last Updated Wednesday, 20-Aug-2008 12:41:27 EDT by Sam.Mccown@noaa.gov
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