PhenologyMetrics module:

Utilizes the Phenex R package to generate phenology related layers for an annual season relying on NDVI time series. The calculated phenology metrics include: (a) the day of the year, at which the greenup takes place, (b) the day of the year with the highest NDVI value and (c) the day of the year, at which senescence takes place. This module can be accessed and executed via the Virtual Laboratory of CNR by following the next steps:

  • 1. Follow: https://vlab.geodab.eu/,
  • 2. Select “Workflows” tab to show the list of workflows,
  • 3. Select “Estimation of phenology metrics .(PhenologyMetrics)”.

This is an online service as a result of the ECOPOTENTIAL H2020 project by the Information Technologies Institute of the Centre for Research and Technology Hellas.

It is based on “Lange, M.; Doktor, D. Phenex: Auxiliary Functions for Phenological Data Analysis, R Package Version 1.4-5. Available online: https://CRAN.R-project.org/package=phenex (accessed on 01 March 2019)”.

 

PhenologyChanges module:

Utilizes the BFAST R package to detect abrupt changes in the vegetation phenology cycles throughout numerous annual NDVI (Normalized Difference Vegetation Index) series. The module calculates per pixel the number of abrupt changes that have occurred, the date of the maximum abrupt change and all dates of abrupt changes. This module can be accessed and executed via the Virtual Laboratory of CNR by following the next steps:

  • 1. Follow: https://vlab.geodab.eu/,
  • 2. Select “Workflows” tab to show the list of workflows,
  • 3. Select “BFAST detection of changes in NDVI approximated phenological cycles (PhenologyChanges)”.

This is an online service as a result of the ECOPOTENTIAL H2020 project by the Information Technologies Institute of the Centre for Research and Technology Hellas.

It is based on “Verbesselt, J.; Zeileis A.; Hyndman, R.: Breaks For Additive Season and Trend (BFAST), R Package Version 1.5.7. Available online: https://cran.r-project.org/web/packages/bfast (accessed on 01 March 2019)”.