NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Cryosphere

AVHRR Polar Pathfinder (APP)

browse graphicAPP channel 1 reflectance
This NOAA Climate Data Record (CDR) contains the AVHRR Polar Pathfinder (APP) product. APP is a fundamental CDR comprised of calibrated and navigated AVHRR channel data (reflectances and brightness temperatures), viewing and illumination geometry (sensor scan angle, solar zenith angle, and sun-sensor relative azimuth angle), Universal Coordinated Time (UTC) of the data acquisition, and a surface type mask. The data are twice daily composites of up to 23 orbits on a 5 km Equal-Area Scalable Earth (EASE)-Grid twice daily over both poles, the Arctic and Antarctic, from 1982 to the present. The daily APP composites are centered on local solar times of 14:00 (high sun, but could be nighttime for some polar areas in winter) and 04:00 for the Arctic or 02:00 for the Antarctic. The APP covers the north polar region (Arctic) from 48.4 degrees northward, and the south polar region (Antarctic) from -53.2 degrees southward.
  • Cite as: Key, Jeffrey; Liu, Yinghui; Wang, Xuanji; and NOAA CDR Program (2015):NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Cryosphere, Version 1.0. NOAA National Centers for Environmental Information (NCEI). doi:10.7289/V5BC3WHM [access date].
Download Data
Distribution Formats
  • NetCDF (Version: 4)
Distributor Customer Engagement Branch
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
1-828-271-4800
ncei.orders@noaa.gov
Dataset Point of Contact NOAA Climate Data Record Program (CDRP)
app_contacts@noaa.gov
Time Period 1982-01-01 to Present (time interval: 12-hour)
Spatial Bounding Box Coordinates
N: 90.0
S: -90.0
E: 180.0
W: -180.0
Spatial Coverage Map
Dataset Information
General Documentation
Processing Documents
  • Source Code Package for APP CDR
    • Source Code Package for APP CDR
      The Source Code Package for the APP CDR. This source code is for reference only. The source code is provided to maintain transparency of the algorithm and processes used in creating the Climate Data Record. The source code is not intended to be portable to any computer system(s) beyond that of the original CDR producer's environment.
  • Data Flow Diagram for APP CDR
  • Climate Algorithm Theoretical Basis Document (C-ATBD) for APP CDR
Associated Resources
Publication Dates
  • publication: 2016-01
Edition Version 1
Data Presentation Form Digital image
Dataset Progress Status Ongoing - data is continually being updated
Data Update Frequency Daily
Purpose This dataset provides advanced scientific researchers a high quality Climate Data Record (CDR) intended for use in deriving higher-level geophysical parameters such as surface temperature and albedo, cloud properties, etc.
Use Limitations
  • For a complete description of use limitations for this CDR, see the Algorithm Theoretical Basis Document.
Dataset Citation
  • Cite as: Key, Jeffrey; Liu, Yinghui; Wang, Xuanji; and NOAA CDR Program (2015):NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Cryosphere, Version 1.0. NOAA National Centers for Environmental Information (NCEI). doi:10.7289/V5BC3WHM [access date].
Cited Authors
  • Key, Jeffery
    DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
  • Lui, Yinghui
    UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison
  • Wang, Xuanji
    UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison
  • NOAA CDR Program
Principal Investigators
  • Key, Jeffery
    DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
Collaborators
  • Lui, Yinghui
    UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison
  • Wang, Xuanji
    UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison
  • NOAA CDR Program
Publishers
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Theme keywords Global Change Master Directory (GCMD) Science Keywords
  • Earth Science > Spectral/Engineering > Infrared Wavelengths > Brightness Temperature
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Platform keywords Global Change Master Directory (GCMD) Platform Keywords
  • NOAA POES > NOAA Polar Orbiting Environmental Satellites
Instrument keywords Global Change Master Directory (GCMD) Instrument Keywords
  • AVHRR > Advanced Very High Resolution Radiometer
Place keywords Global Change Master Directory (GCMD) Location Keywords
  • Geographic Region > Arctic
  • Continent > Antarctica
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • NOAA OneStop Project
Data Resolution keywords Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
  • 1 km - < 10 km or approximately .01 degree - < .09 degree
Stratum keywords Global Change Master Directory (GCMD) Location Keywords
  • Vertical Location > Land Surface
  • Vertical Location > Sea Surface
Use Constraints
  • Cite as: Key, Jeffrey; Liu, Yinghui; Wang, Xuanji; and NOAA CDR Program (2015):NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Cryosphere, Version 1.0. NOAA National Centers for Environmental Information (NCEI). doi:10.7289/V5BC3WHM [access date].
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Access Constraints
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Fees
  • In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for: dataset
Lineage Statement This Climate Data Record (CDR) were produced by NOAA Center for Satellite Applications and Research (STAR) and University of Wisconsin and are archived at the NOAA National Centers for Environmental Information (NCEI).
Processing Steps
  • For a complete description of the processing steps, see the Algorithm Theoretical Basis Document and Data Flow Diagram.
Processing Documents
    • Source Code Package for APP CDR
      • Source Code Package for APP CDR
        The Source Code Package for the APP CDR. This source code is for reference only. The source code is provided to maintain transparency of the algorithm and processes used in creating the Climate Data Record. The source code is not intended to be portable to any computer system(s) beyond that of the original CDR producer's environment.
    • Data Flow Diagram for APP CDR
Source Datasets
  • Level 1b AVHRR Global Area Coverage
    • Level 1b AVHRR Global Area Coverage
      Landing page for dataset, where the DOI points to.
    • Description of Source: Level 1b AVHRR Global Area Coverage from CLASS
    • Temporal extent used: 1982 to Present
    • Spatial extent used: N:90 S:-90 E:180 W:0
Lineage information for: repository
Processing Steps
  • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Last Modified: 2018-11-05
For questions about the information on this page, please email: ncei.orders@noaa.gov