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  • eMODIS Phenology: 2001-Present -

    Metadata Updated: March 22, 2021

    The Remote Sensing Phenology (RSP) collection is a set of nine annual phenological metrics for the conterminous United States. Researchers at the USGS EROS Center utilize data gathered by satellite sensors to track seasonal changes in vegetation. The satellite sensors that provide the raw data are the Moderate Resolution Imaging Spectroradiometer (MODIS) carried aboard National Aeronautics and Space Administration (NASA) Terra and Aqua satellites. The satellite data are initially transformed into Normalized Difference Vegetation Index (NDVI) values. eMODIS NDVI provide the foundation for the phenology metrics. Time-series NDVI can be summarized and analyzed to produce nine key phenological indicators. These data represent a powerful tool for documenting plant life-cycle trends and detecting the impacts of climate change on ecosystems. The complete set of phenological metrics are as follows: 1. Start of Season Time (SOST): starting time of the onset of the growing season (in day of the year). 2. Start of Season NDVI (SOSN): NDVI value at the starting time of the onset of the growing season (unitless- based on NDVI units). 3. End of Season Time (EOST): ending time of the growing season (in day of the year). 4. End of Season NDVI (EOSN): NDVI value at the ending time of the growing season (unitless-based on NDVI units). 5. Maximum Time (MAXT): the day of the year when the NDVI reaches its maximum during the growing season (in day of the year). 6. Maximum NDVI (MAXN): the highest (or peak) value in NDVI observed in a growing season (unitless-based on NDVI units). 7. Duration (DUR): the length of the growing season-the time between the start of season and end of season (in number of days). 8. Amplitude (AMP): the difference between the Maximum NDVI and NDVI at the day of start of season (unitless-based on NDVI units). 9. Time Integrated NDVI (TIN): the cumulative value of NDVI from the start to the end of the growing season (unitless-based on accumulated NDVI unit

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    Dates

    Metadata Date August 8, 2019
    Metadata Created Date March 22, 2021
    Metadata Updated Date March 22, 2021
    Reference Date(s) August 8, 2019 (publication)
    Frequency Of Update EVERY YEAR, SYNCHRONIZED WITH THE UPDATE OF EMODIS NDVI DATA AND CONTINGENT UPON AVAILABILITY OF FUNDING.

    Metadata Source

    Harvested from USGS-Harvest

    Additional Metadata

    Resource Type Dataset
    Metadata Date August 8, 2019
    Metadata Created Date March 22, 2021
    Metadata Updated Date March 22, 2021
    Reference Date(s) August 8, 2019 (publication)
    Responsible Party U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center (Point of Contact)
    Contact Email
    Guid
    Access Constraints Use Constraints: There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer., Access Constraints: Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.
    Bbox East Long -65.4
    Bbox North Lat 51.7
    Bbox South Lat 22.5
    Bbox West Long -128.5
    Coupled Resource
    Frequency Of Update EVERY YEAR, SYNCHRONIZED WITH THE UPDATE OF EMODIS NDVI DATA AND CONTINGENT UPON AVAILABILITY OF FUNDING.
    Licence Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty.
    Metadata Language eng; USA
    Metadata Type geospatial
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True

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