gov.noaa.ncdc:C01580 eng; USA utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact 2025-12-10T17:28:45 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder Extended (APP-X) Cryosphere, Version 2 Extended AVHRR Polar Pathfinder (APP-x) 2019 publication Version 2 doi:10.25921/AE96-0E57 NCEI DSI 3710_02 gov.noaa.ncdc:C01580 Access Identifier avhrr-polar-pathfinder-extended DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher Key, Jeffery DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce Branch Chief +1 608-263-2605 jeff.key@noaa.gov originator Key, Jeffery DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce Branch Chief +1 608-263-2605 jeff.key@noaa.gov author Wang, Xuanji UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison Research Scientist +1 608-261-1390 xuanji.wang@ssec.wisc.edu collaborator Wang, Xuanji UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison Research Scientist +1 608-261-1390 xuanji.wang@ssec.wisc.edu author Lui, Yinghui UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison Research Scientist +1 608-890-1893 yinghuil@ssec.wisc.edu collaborator Lui, Yinghui UWI-MAD/SSEC/CIMSS > Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison Research Scientist +1 608-890-1893 yinghuil@ssec.wisc.edu author NOAA CDR Program author NOAA CDR Program collaborator DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher imageDigital NOAA Climate Data Record (CDR) of the eXtended AVHRR Polar Pathfinder (APP-X) cryosphere contains 19 geophysical variables over the Arctic and Antarctic for the period 1982 - present. All of them have undergone various degrees of validation, though not all are considered CDR quality. The variables are (those considered by the developers to be CDR-quality are identified with an asterisk): Surface temperature, all-sky, snow, ice, and land* Surface albedo, all-sky* Sea ice thickness* Surface type Cloud mask* Cloud particle thermodynamic phase Cloud optical depth Cloud particle effective radius Cloud temperature Cloud pressure Cloud type Downwelling shortwave radiation at the surface* Downwelling longwave radiation at the surface* Upwelling shortwave radiation at the surface* Upwelling longwave radiation at the surface* Upwelling shortwave radiation at the TOA* Upwelling longwave radiation at the TOA* Shortwave cloud radiative forcing at the surface Longwave cloud radiative forcing at the surface APP-x data products are mapped to a 25 km EASE grid at two local solar times: 04:00 and 14:00 for the Arctic, and 02:00 and 14:00 for the Antarctica. Using local solar time rather than standard UTC times provides better information on diurnal differences at all locations. The latest update to version 2 includes folding in the APP FCDR updates (updated calibration coefficients for AVHRR GAC visible channels) along with improved algorithms for the land mask, cloud mask, and ice thickness. This dataset provides a high quality Climate Data Record (CDR) for use in polar climate studies, climate monitoring, and model verification. DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce NOAA Climate Data Record Program Office +1 (828) 271-4800 +1 (828) 271-4328 151 Patton Avenue Veach-Baley Federal Building, Room 447 Asheville NC 28801-5001 USA app_contacts@noaa.gov https://www.ncei.noaa.gov/products/climate-data-records HTTPS Web Browser CDR Program Contacts Contact information for the CDR Program. information 8:00 - 6:00 Eastern pointOfContact daily https://www.ncei.noaa.gov/pub/data/metadata/images/C00941_appx_surface_albedo.jpg APP-x broadband surface albedo JPEG Earth Science > Cryosphere theme Global Change Master Directory (GCMD) Science Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Oceanic - Surface - Sea Ice Atmospheric - Upper-air - Cloud Properties Terrestrial - Albedo Atmospheric - Surface - Surface Radiation Budget (including Solar Irradiance) Atmospheric - Surface - Air Temperature Oceanic - Surface - Sea-surface Temperature theme Global Climate Observing System (GCOS) Essential Climate Variables (ECVs) 2017 publication Release 2017 World Meteorological Organization, United Nations https://public.wmo.int/en/programmes/global-climate-observing-system/essential-climate-variables HTTP Information GCOS Essential Climate Variables Overview of the GCOS Essential Climate Variables. information custodian Geographic Region > Arctic Continent > Antarctica place Global Change Master Directory (GCMD) Location Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Vertical Location > Land Surface Vertical Location > Sea Surface stratum Global Change Master Directory (GCMD) Location Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher NOAA Climate Data Record (CDR) Program NOAA OneStop Project project Global Change Master Directory (GCMD) Project Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher AVHRR > Advanced Very High Resolution Radiometer instrument Global Change Master Directory (GCMD) Instrument Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher NOAA POES > NOAA Polar Orbiting Environmental Satellites platform Global Change Master Directory (GCMD) Platform Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher 10 km - < 50 km or approximately .09 degree - < .5 degree dataResolution Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Satellite product Keyword Thesaurus Title DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Uncertainties in most of the retrieve parameters (e.g., surface temperature, cloud optical depth, etc.) are smallest in the presence of sunlight ("polar day") and largest during the polar winter. Cloud detection in the polar regions at night is notoriously difficult. All other retrieved parameters are in one way or another dependent upon cloud detection. See the Algorithm Theoretical Basis Document for a description of use limitations. otherRestrictions Cite as: Key, Jeffrey; Wang, Xuanji; Liu, Yinghui; and NOAA CDR Program (2019). NOAA Climate Data Record of AVHRR Polar Pathfinder Extended (APP-X), Version 2. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.25921/AE96-0E57 [access date]. otherRestrictions See the Use Agreement for this CDR available on the CDR page. otherRestrictions 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. otherRestrictions 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. Arctic Surface, Cloud, and Radiation Properties Based on the AVHRR Polar Pathfinder Dataset. Part I: Spatial and Temporal Characteristics 2005 publication 18 (14), 2558-2574 Journal of Climate publisher https://doi.org/10.1175/JCLI3438.1 HTTPS Web Browser Journal of Climate Article Article landing page. information crossReference sciencePaper High-latitude surface temperature estimates from thermal satellite data 1997 publication 61, 302-309 Remote Sensing of Environment publisher https://doi.org/10.1016/S0034-4257(97)89497-7 HTTPS Web Browser Remote Sensing of Environment Article Article landing page. information crossReference sciencePaper Cloud cover analysis with Arctic AVHRR, part 1: cloud detection 1992 publication 97 (D5), 5885-5893 Journal of Geophysical Research publisher https://doi.org/10.1029/JD094iD15p18521 HTTPS Web Browser Journal of Geophysical Research Article Article landing page. information crossReference sciencePaper Cloud particle phase determination with the AVHRR 2000 publication 36 (10), 1797-1805 Journal of Applied Meteorology publisher https://doi.org/10.1175/1520-0450-39.10.1797 HTTPS Web Browser Journal of Applied Meteorology and Climatology Article Article landing page. information crossReference sciencePaper A thermodynamic model for estimating sea and lake ice thickness with optical satellite data 2010 publication 115, C12035 Journal of Geophysical Research publisher https://doi.org/10.1029/2009JC005857 HTTPS Web Browser Journal of Geophysical Research Article Article landing page. information crossReference sciencePaper NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Cryosphere, Version 2 2019 publication DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher https://doi.org/10.25921/X2X1-JR34 HTTPS Web Browser NCEI landing page for the APP CDR Related dataset landing page. information crossReference project grid 25000 eng; USA climatologyMeteorologyAtmosphere 1 -180.0 180.0 -90.0 90.0 ground condition 1982-01-01 12 physicalMeasurement cdr_surface_temperature float NOAA CDR of surface skin temperature (surface_temperature) cdr_surface_albedo float NOAA CDR of surface broadband albedo (surface_albedo) cdr_cloud_binary_mask short NOAA CDR of cloud mask cloud_particle_phase short cloud particle phase cloud_particle_radius float cloud particle radius cloud_optical_depth float cloud optical depth cloud_top_pressure float cloud top pressure cloud_top_temperature float cloud top temperature NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information distributor In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. XML NetCDF 4 The NetCDF data files comply with the Climate and Forecast (CF) Metadata Conventions and the NetCDF Attribute Convention for Dataset Discovery (ACDD). NetCDF 4 The NetCDF data files comply with the Climate and Forecast (CF) Metadata Conventions and the NetCDF Attribute Convention for Dataset Discovery (ACDD). NetCDF 4 The NetCDF data files comply with the Climate and Forecast (CF) Metadata Conventions and the NetCDF Attribute Convention for Dataset Discovery (ACDD). https://doi.org/10.25921/AE96-0E57 HTTPS Landing Page NCEI Dataset Landing Page Landing page for the dataset. information https://www.ncei.noaa.gov/products/climate-data-records/extended-avhrr-polar-pathfinder HTTPS Information NOAA CDR Page Access to the published CDR product, documentation and source code. information https://www.ncei.noaa.gov/data/avhrr-polar-pathfinder-extended/access/ HTTPS Download NCEI Direct Download Direct download links for dataset files. download https://www.ncei.noaa.gov/thredds/catalog/avhrr-polar-pathfinder-ext-files/catalog.html HTTPS THREDDS NCEI THREDDS Catalog THREDDS Data Service for this dataset. download https://registry.opendata.aws/noaa-cdr-fundamental/ HTTPS Information Registry of Open Data on AWS Information on AWS data access. information Region: us-east-1 https://noaa-cdr-polar-pathfinder-extended-pds.s3.amazonaws.com/index.html HTTPS Download AWS S3 Explorer (Region: us-east-1) Browse view to explore the S3 bucket. download Region: us-east https://microsoft.github.io/AIforEarthDataSets/data/noaa-cdr.html HTTPS Information Azure Landing Page (Region: us-east) Information on Microsoft Azure data access. information dataset 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 Climatic Data Center (NCDC). For a complete description of the processing steps, see the Algorithm Theoretical Basis Document and Data Flow Diagram. DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce processor APPX Source Code Version 2 DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce publisher https://www.ncei.noaa.gov/pub/data/sds/cdr/CDRs/AVHRR_Extended_Polar_Pathfinder/SourceCode_01B-24b.tar.gz HTTPS Web Browser CDR Source Code 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 (CDR). The source code is not intended to be portable to any computer system(s) beyond that of the original CDR producer's environment. download APP-X Processing Overview 2017 publication Version 2 DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce publisher https://www.ncei.noaa.gov/pub/data/sds/cdr/CDRs/AVHRR_Extended_Polar_Pathfinder/DataFlowDiagram_01B-24b.pdf HTTPS Web Browser CDR Data Flow Diagram Data processing flowchart for the CDR product. information Climate Algorithm Theoretical Basis Document for AVHRR Polar Pathfinder Extended (APP-X) Cryosphere CDR 2023 publication Rev 3 NOAA National Centers for Environmental Information publisher https://www.ncei.noaa.gov/pub/data/sds/cdr/CDRs/AVHRR_Extended_Polar_Pathfinder/AlgorithmDescription_01B-24b.pdf HTTPS Web Browser Climate Algorithm Theoretical Basis Document ATBD for the CDR product. download AVHRR Polar Pathfinder (APP) NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Climate Data Record (CDR) doi:10.25921/X2X1-JR34 DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher https://doi.org/10.25921/X2X1-JR34 HTTPS Web Browser NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder (APP) Climate Data Record (CDR) Landing page for APP CDR input information 1 0 180 -90 90 1982 repository NOAA National Centers for Environmental Information 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. 2015-04-22T00:00:00 dataset Data Stewardship Data Stewardship Maturity Assessment MM-Stew The Data Stewardship Maturity Matrix (DSMM) is a unified framework that defines criteria for each of nine components based on measurable practices, which can be used to apply a progressive, 6-level rating to an individual dataset, representing stewardship maturity stages rated as Not Assessed or Not Available (Level 0), adHoc (Level 1), minimum (Level 2), intermediate (Level 3), advanced (Level 4), and optimal (Level 5). Data Stewardship Maturity Assessment was evaluated by the metadata content editor for the NOAA OneStop project using the Scientific Data Stewardship Maturity Assessment Model Template v4.0. The Scientific Data Stewardship Maturity Assessment Model Template 2016-06-27 publication NCDC-CICS-SMM_0001_Rev.1 v4.0 06/27/2016 doi:10.10.6084/m9.figshare.1211954 Peng, Ge CICS-NC/NCEI author https://doi.org/10.6084/m9.figshare.1211954 HTTPS Web Browser The Scientific Data Stewardship Maturity Assessment Model Template Landing page for quality evaluation procedure. information 2016-06-27T00:00:00 intermediate minimal minimal advanced intermediate advanced intermediate advanced advanced asNeeded Bulk metadata change applied on 2023-07-06. See version control repository history for metadata change details.