MODIS-derived NDVI metrics

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Summary

GINA and the National Park Service worked together to develop a MODIS-derived NDVI metrics algorithm. The data products from this project are available as yearly NDVI  metrics files. The data coverage includes the entire state of Alaska.

Data Sources

The NDVI metrics algorithm uses eMODIS 7-day NDVI composite data provided by the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center. The detail product description comes from the USGS, and the data set can be downloaded from the USGS-EROS eMODIS website.

Product Details

The MODIS-derived NDVI metrics algorithm takes a year of eMODIS 7-day composite  NDVI data as input, performs data stacking, interpolating, smoothing, and calculates the 12 NDVI metrics and output a 12-band geotiff raster file for the year. 12 metrics are defined as:

  1. onset of greenness /Start day of Season (SOS)
  2. NDVI value of onset of greenness
  3. end of greenness /End day of Season (EOS)
  4. NDVI value of end of greenness
  5. duration of greenness – day range between onset of greenness and end of greenness
  6. day with maximum NDVI
  7. value of maximum NDVI
  8. Range of NDVI
  9. Rate of green up
10. Rate of senescence
11. Time-integrated NDVI
12. Metrics ‘flag’, where -1=no data, 0=not valid data, 1=good data

The 12-band metrics files are accessible through the WCS server at  URL: http://ndvi.gina.alaska.edu/metrics/emodis?  The 5-band metrics  files which includes band 1, 3, 5, 6, and 12 are also provided at WCS server URL: http://ndvi.gina.alaska.edu/metrics/emodis_5bands?

The 12-band NDVI metrics are also available through GINA's http server at http://static.gina.alaska.edu/NPS_products/eMODIS_NDVI/eMODIS_derived_NDVI_metrics/version_1.0/. Pay attention that the data delivered by the http server are in ENVI format. One year of NDVI metrics includes two files with one image file and one header file. 

Now, the dataset includes yearly metrics from 2000 to 2016.

Sample plots of the metrics

Start Day      End Day    Start End Range

Additional Information

About GINA MODIS NDVI Services

The NDVI metrics algorithm  technical document is available online along with the poster for the metrics algorithm presented on the 47th Annual Alaska Surveying and Mapping Conference Feb. 18-22, 2013. 

Acknowledgements

Amy E. Miller, Chuck Lindsay, Parker Martyn from National Park Service Anchorage
for developing NDVI metrics algorithm

David K. Swanson for evaluation and feedback of NDVI metrics algorithm
Ecologist, Arctic Network
National Park Service

Michael E Budde for evaluation and feedback of NDVI metrics algorithm
Geographer - US Geological Survey
Earth Resources Observation and Science (EROS) Center

Calli B. Jenkerson for providing and explanation of eMODIS products
MODIS SS NASA LPDAAC USGS EROS ERT
Contractor to the U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
http://lpdaac.usgs.gov

Tom Heinrichs at GINA for project management

Dayne Broderson at GINA for project management, helping develop the algorithm and documentation

Jay Cable at GINA for data management and presentation of metrics data in WCS

Will Fisher at GINA for editing the documentation