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Dataset

 

Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC) Level 1B data

Update Frequency: Not Planned
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2014-09-10
Download Stats: last 12 months

Abstract

4km resolution Global Area Coverage (GAC) Advanced Very High Resolution Radiometer (AVHRR) Level 1B data are available from 1978 - 2013 for the whole globe from NOAA satellites 06 through 12, 14 through 19 and Tiros-N, and from Metop A and B.

Citable as:  National Oceanic and Atmospheric Administration; EUMETSAT (2014): Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC) Level 1B data. NERC Earth Observation Data Centre, date of citation. https://catalogue.ceda.ac.uk/uuid/1105a30c49a01dde0032515cadb056ad
Abbreviation: Not defined
Keywords: Not defined

Details

Previous Info:
No news update for this record
Previously used record identifiers:
http://badc.nerc.ac.uk/view/neodc.nerc.ac.uk__ATOM__ACTIVITY_3da84806-38fd-11e4-95bc-00163e251233
Access rules:
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were obtained directly from the NOAA Comprehensive Large Array-Data Stewardship System (CLASS).

File Format:
Data availability and file format

NOAA Level 1B (following FGGE terminology) is raw data that have been quality controlled, assembled into discrete data sets, and to which Earth location and calibration information have been appended (but not applied).

Software is available, free of charge, which may assist you in viewing data from AVHRR instruments:

  • BEAM: BEAM is an open-source toolbox and development platform for viewing, analysing and processing of remote sensing raster data. Originally developed to facilitate the utilisation of image data from Envisat's optical instruments, BEAM now supports a growing number data formats of other EO sensors such as AVHRR.

More Information (under review)


Introduction

4km resolution Global Area Coverage (GAC) Advanced Very High Resolution Radiometer (AVHRR) Level 1B data are available from 1978 - 2013 for the whole globe from NOAA satellites 06 through 12, 14 through 19 and Tiros-N, and from Metop A and B. For details of instrument versions and timespans available for each satellite see the table below.

The AVHRR sensor is carried on NOAA's Polar-orbiting Operational Environmental Satellites (POES) starting with TIROS-N in 1978. Onboard the TIROS-N, NOAA-6, 8 and 10 POES Satellites, the AVHRR Sensor measures in four spectral bands, while on the NOAA-7, 9, 11, 12 and 14 POES Satellites, the sensor measures in five bands. The AVHRR/3 sensor on NOAA-15, 16, 17, 18 and 19 measures in six bands though only five are transmitted to the ground at any time. One data type produced by AVHRR is Global Area Coverage (GAC) which is reduced resolution image data that is processed onboard the satellite taking only one line out of every three and averaging every four of five adjacent samples along the scan line.

The Advanced Very High Resolution Radiometer for TIROS-N and the follow-on satellites is a scanning radiometer with either four or five channels, which are sensitive to visible/near IR and infrared radiation. The instrument channelization has been chosen to permit multispectral analyses which provide improved determination of hydrologic, oceanographic, and meteorological parameters. The visible (0.5 micron) and visible/near IR (0.9 micron) channels are used to discern clouds, land-water boundaries, snow and ice extent, and, when the data from the two channels are compared, an indication of ice/snow melt inception. The IR window channels are used to measure cloud distribution and to determine the temperature of the radiating surface (cloud or surface). Data from the two IR channels is incorporated into the computation of sea surface temperature. By using these two channels, it is possible to remove an ambiguity introduced when clouds fill a portion of the field-of-view. On later instruments in the series, a third IR channel was added for the capability of removing radiant contributions from water vapor when determining surface temperatures. Prior to inclusion of this third channel, corrections for water vapor contributions were based on statistical means using climatological estimates of water vapor content.

Satellite Instrument version Archive start date Archive end date
TIROS-N
AVHRR-1
1978/11/05
1980/01/30
NOAA-6
AVHRR-1
1981/09/01
1981/12/27
NOAA-7
AVHRR-2
1981/09/01
1985/02/01
NOAA-8
AVHRR-1
1983/05/04
1985/10/14
NOAA-9
AVHRR-2
1985/02/25
1988/11/07
NOAA-10
AVHRR-1
1986/11/17
1991/09/16
NOAA-11
AVHRR-2
1988/11/08
1994/12/31
NOAA-12
AVHRR-2
1991/09/16
1998/12/14
NOAA-14
AVHRR-2
1995/01/01
2002/10/07
NOAA-15
AVHRR-3
1998/10/26
2010/12/31
NOAA-16
AVHRR-3
2001/01/01
2010/12/31
NOAA-17
AVHRR-3
2002/06/25
2010/12/31
NOAA-18
AVHRR-3
2005/05/20
2013/12/31
NOAA-19
AVHRR-3
2009/02/06
2013/12/31
METOP-A
AVHRR-3
2006/10/30
2013/12/31
METOP-B
AVHRR-3
2013/01/15
2013/12/31

The spectral bands are as follows:

Band Spectral Region AVHRR-1 (µm) AVHRR-1 (Tiros-N) (µm) AVHRR-2 (µm) AVHRR-3 (µm)
1 Visible
0.58-0.68
0.55-0.90
0.58-0.68
0.58-0.68
2 Near InfraRed (NIR)
0.725-1.10
0.725-1.10
0.725-1.10
0.725-1.10
3A Short-Wave InfraRed (SWIR)
N/A
N/A
N/A
1.58-1.64
3B Medium-Wave InfraRed (MWIR)
3.55-3.93
3.55-3.93
3.55-3.93
3.55-3.93
4 Thermal InfraRed (TIR)
10.5-11.5
10.5-11.5
10.3-11.3
10.3-11.3
5 Thermal InfraRed (TIR)
N/A
N/A
11.5-12.5
11.5-12.5


Restricted Data Access

The AVHRR GAC data stored at the NEODC are available to registered NEODC users. To obtain access to the data please register as a NEODC user. If you have forgotten your NEODC user ID and/or password, please contact the NEODC helpdesk. Once you have registered, the web browser download link can be found in the online references section below.


Data availability and file format

NOAA Level 1B (following FGGE terminology) is raw data that have been quality controlled, assembled into discrete data sets, and to which Earth location and calibration information have been appended (but not applied).

Software is available, free of charge, which may assist you in viewing data from AVHRR instruments:

  • BEAM: BEAM is an open-source toolbox and development platform for viewing, analysing and processing of remote sensing raster data. Originally developed to facilitate the utilisation of image data from Envisat's optical instruments, BEAM now supports a growing number data formats of other EO sensors such as AVHRR.


Software

Basic ERS & Envisat (A) ATSR and Meris Toolbox (BEAM): BEAM is an open-source toolbox and development platform for viewing, analysing and processing of remote sensing raster data. Originally developed to facilitate the utilisation of image data from Envisat's optical instruments, BEAM now supports a growing number of other raster data formats such as GeoTIFF and NetCDF as well as data formats of other Earth Observation (EO) sensors such as Moderate Resolution Imaging Spectroradiometer (MODIS), Advanced Very High Resolution Radiometer (AVHRR), AVNIR, Polarised Radiation Imaging and Spectroscopy Mission (PRISM) and Compact High Resolution Imaging Spectrometer (CHRIS). Various data and algorithms are supported by dedicated extension plug-ins.

Documentation

Links to further information

  • NOAA information on AVHRR
  • ESA information on AVHRR
  • EUMETSAT information on AVHRR

Who to contact

For any enquiries concerning the AVHRR GAC data held at the NEODC please contact the NEODC helpdesk

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Mobile platform operations

Mobile Platform Operation 1 Mobile Platform Operation for: Metop-B
Mobile Platform Operation 2 Mobile Platform Operation for: Metop-A
Mobile Platform Operation 3 Mobile Platform Operation for: NOAA Polar Orbiting environmental satellites (POES)

Computation Element: 1

Title Computation for IASI level 1C data deployed on Metop-B
Abstract This data set contains both the original processed data and reprocessed archive. in the following directories based on processing algorithm. The version number indicates the computation/processor used by EUMETSAT to produce the data. For further information on the version processor please see documentation on the EUMETSAT website v6-2N: Original processing years 2013 v6-5N: Original processing years 2013 v7-0N: Original processing years 2013 - 2014 v7-1N: Original processing years 2014-2015 v7-2N: Original processing years 2015 v7-3N: Original processing years 2015-2017 v7-4N: Original processing years 2017 v8-0N Original processing years 2017 - 2019 v8-2N Original processing years 2019 - ongoing
Input Description None
Output Description None
Software Reference None

Computation Element: 2

Title deployed on NOAA Polar Orbiting environmental satellites (POES)
Abstract This computation involved: deployed on NOAA Polar Orbiting environmental satellites (POES).
Input Description None
Output Description None
Software Reference None

Computation Element: 3

Title Computation for data from the IASI instrument deployed on Metop-A
Abstract This data set contains both the original processed data and reprocessed archive. in the following directories based on processing algorithm. The version number indicates the computation/processor used by EUMETSAT to produce the data. For further information on the version processor please see documentation on the EUMETSAT website v0-0N: Original processing years 2011-2012 v3-6N: Original processing years 2007 v4-0N: Original processing years 2007-2010 v5-0N: Original processing years 2010 v5-1N: Original processing years 2010-2011 v6-2N: Original processing years 2012-2014 v6-5N: Original processing years 2013 v7-0N: Original processing years 2013-2014 v7-1N: Original processing years 2014-2015 v7-2N: Original processing years 2015 v7-3N: Original processing years 2015-2017 v7-4N: Original processing years 2017 v8-0N: Original processing years 2017-2018 v8-0R: Reprocessed Archive years 2007-2017 v8-2N: Original processing years 2019 - being acquired on an ongoing basis
Input Description None
Output Description None
Software Reference None
Output Description None

No variables found.

Coverage
Temporal Range
Start time:
1978-11-05T00:00:00
End time:
2013-12-31T00:00:00
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
-90.0000°