phenofit

A state-of-the-art remote sensing vegetation phenology extraction package.
https://github.com/eco-hydro/phenofit

Category: Biosphere
Sub Category: Plants and Vegetation

Keywords

phenology remote-sensing

Last synced: 1 day ago
JSON representation

Repository metadata

R package: A state-of-the-art Vegetation Phenology extraction package, phenofit

• Host: GitHub
• URL: https://github.com/eco-hydro/phenofit
• Owner: eco-hydro
• License: gpl-2.0
• Created: 2018-04-23T08:40:14.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2025-10-15T07:57:35.000Z (2 months ago)
• Last Synced: 2025-11-15T16:01:50.224Z (about 1 month ago)
• Topics: phenology, remote-sensing
• Language: R
• Homepage: http://phenofit.top
• Size: 98.2 MB
• Stars: 84
• Watchers: 6
• Forks: 37
• Open Issues: 3
• Releases: 6
• Metadata Files:
  • Readme: README.Rmd
  • Changelog: NEWS.md
  • License: LICENSE

README.Rmd

          ---
output: github_document
---

```{r, echo = FALSE}
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#",
  fig.width = 10, fig.height = 5,
  fig.align = "center",
  fig.path  = "man/Figure/",
  dev = 'svg'
)
```
# phenofit  
[![R-CMD-check](https://github.com/eco-hydro/phenofit/workflows/R-CMD-check/badge.svg)](https://github.com/eco-hydro/phenofit/actions)
[![codecov](https://codecov.io/gh/eco-hydro/phenofit/branch/master/graph/badge.svg)](https://app.codecov.io/gh/eco-hydro/phenofit)
[![License](https://img.shields.io/badge/license-GPL%20%28%3E=%202%29-brightgreen.svg?style=flat)](http://www.gnu.org/licenses/gpl-2.0.html)
[![CRAN](https://www.r-pkg.org/badges/version/phenofit)](https://cran.r-project.org/package=phenofit)
[![total](https://cranlogs.r-pkg.org/badges/grand-total/phenofit)](https://cran.r-project.org/package=phenofit)
[![monthly](https://cranlogs.r-pkg.org/badges/phenofit)](https://cran.r-project.org/package=phenofit)
[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5150204.svg)](https://doi.org/10.5281/zenodo.5150204)

A state-of-the-art **remote sensing vegetation phenology** extraction package: `phenofit`

- `phenofit` combine merits of TIMESAT and phenopix
- A simple and stable growing season dividing methods was proposed
- Provide a practical snow elimination method, based on Whittaker
- 7 curve fitting methods and 4 phenology extraction methods
- We add parameters boundary for every curve fitting methods according to their ecological meaning.
- `optimx` is used to select best optimization method for different curve fitting methods.


***Task lists***

- [x] Test the performance of `phenofit` in multiple growing season regions (e.g. the North China Plain);
- [ ] Uncertainty analysis of curve fitting and phenological metrics;
- [x] shiny app has been moved to [phenofit.shiny](https://github.com/eco-hydro/phenofit.shiny);
- [x] Complete script automatic generating module in shinyapp;
- [x] `Rcpp` improve double logistics optimization efficiency by 60%;
- [x] Support spatial analysis;
- [x] Support annual season in curve fitting;
- [x] flexible fine fitting input ( original time-series or smoothed time-series by rough fitting).
- [x] Asymmetric of Threshold method



# Installation

You can install phenofit from github with:

```{r gh-installation, eval = FALSE}
# install.packages("remotes")
remotes::install_github("eco-hydro/phenofit")
```

# Note

Users can through the following options to improve the performance of phenofit in multiple growing 
season regions:

- Users can decrease those three parameters `nextend`, `minExtendMonth` and
  `maxExtendMonth` to a relative low value, by setting option 
  `set_options(fitting = list(nextend = 1, minExtendMonth = 0, maxExtendMonth = 0.5))`.

- Use `wHANTS` as the rough fitting function. Due to nature of fourier functions,
  `wHANTS` is more stable for multiple growing seasons, but it is less flexible
  than `wWHIT.` `wHANTS` is suitable for regions with the static growing season
  pattern accoss multiple years, `wWHIT` is more suitable for regions with the
  dynamic growing season pattern. 
  Dynamic growing season pattern is the most challenging task, which also means
  that large uncertainty might be exists.

- Use only one iteration in fine fitting procedure.

# **References** 

> [1] Kong, D., McVicar, T. R., Xiao, M., Zhang, Y., Peña-Arancibia, J. L., Filippa, G., Xie, Y., Gu, X. (2022). phenofit: An R package for extracting vegetation phenology from time series remote sensing. *Methods in Ecology and Evolution*, 13, 1508-1527. https://doi.org/10.1111/2041-210X.13870

> [2] Kong, D., Zhang, Y., Wang, D., Chen, J., & Gu, X. (2020). Photoperiod Explains the Asynchronization Between Vegetation Carbon Phenology and Vegetation Greenness Phenology. *Journal of Geophysical Research: Biogeosciences*, 125(8), e2020JG005636. https://doi.org/10.1029/2020JG005636
>
> [3] Kong, D., Zhang, Y., Gu, X., & Wang, D. (2019). A robust method for reconstructing global MODIS EVI time series on the Google Earth Engine. *ISPRS Journal of Photogrammetry and Remote Sensing*, 155, 13–24.
>
> [4] Kong, D., (2020). R package: A state-of-the-art Vegetation Phenology extraction package, `phenofit` version 0.3.1, 
>
> [5] Zhang, Q., Kong, D., Shi, P., Singh, V.P., Sun, P., 2018. Vegetation phenology on the Qinghai-Tibetan Plateau and its response to climate change (1982–2013). Agric. For. Meteorol. 248, 408–417. 

# Acknowledgements

Keep in mind that this repository is released under a GPL2 license, which permits commercial use but requires that the source code (of derivatives) is always open even if hosted as a web service.

        

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Owner metadata

• Name: Eco-Hydrological Researches in China University of Geosciences (Wuhan)
• Login: eco-hydro
• Email:
• Kind: organization
• Description:
• Website: http://www.phenofit.top/
• Location: China
• Twitter:
• Company:
• Icon url: https://avatars.githubusercontent.com/u/86526225?v=4
• Repositories: 5
• Last ynced at: 2023-02-27T16:07:59.820Z
• Profile URL: https://github.com/eco-hydro

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GitHub Events

Total

• Issues event: 3
• Watch event: 6
• Issue comment event: 3
• Push event: 7
• Pull request event: 3
• Fork event: 5

Last Year

• Issues event: 2
• Watch event: 4
• Issue comment event: 1
• Push event: 5
• Pull request event: 3
• Fork event: 4

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Committers metadata

Last synced: 1 day ago

Name	Email	Commits
Dongdong Kong	k****d	219
Dirk Eddelbuettel	e****d@d****g	2
Hadley Wickham	h****y@p****o	1

Committer domains:

• posit.co: 1
• debian.org: 1

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Issue and Pull Request metadata

Last synced: about 2 months ago

More stats: https://issues.ecosyste.ms/repositories/lookup?url=https://github.com/eco-hydro/phenofit

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Package metadata

• Total packages: 1
• Total downloads:
  • cran: 1,229 last-month
• Total dependent packages: 0
• Total dependent repositories: 2
• Total versions: 11
• Total maintainers: 1

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Dependencies

Score: 12.680914551416159