CA_NS6

Variables in <code>CA-NS6</code>:<ul>
<li><code>site</code>: site name</li>
<li><code>y</code>: EVI</li>
<li><code>date</code>: date of image</li>
<li><code>t</code>: date of compositing image</li>
<li><code>w</code>: weights of data point</li>
<li><code>QC_flag</code>: QC flag of y, in the range of <code>c("snow", "cloud", "shadow", "aerosol", "marginal", "good")</code></li>
</ul>

datasets

The merits of 'TIMESAT' and 'phenopix' are adopted. Besides, a simple and
growing season dividing method and a practical snow elimination method
based on Whittaker were proposed. 7 curve fitting methods and 4 phenology
extraction methods were provided. Parameters boundary are considered for
every curve fitting methods according to their ecological meaning.
And 'optimx' is used to select best optimization method for different
curve fitting methods.
Reference:
Kong, D., (2020). R package: A state-of-the-art Vegetation Phenology extraction
package, phenofit version 0.3.1, <doi:10.5281/zenodo.5150204>;
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.
<doi:10.1029/2020JG005636>;
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;
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. <doi:10.1016/j.agrformet.2017.10.026>.

Dongdong Kong

phenofit

Extract Remote Sensing Vegetation Phenology

Mingzhong Xiao

Yongqiang Zhang

Xihui Gu

Jianjian Cui

CA_NS6 function

An object of class <code>data.table</code> (inherits from <code>data.frame</code>) with 161 rows and 6 columns.

Format

MOD13A1 EVI observations at flux site CA-NS6 — CA_NS6

MOD13A1 EVI observations at flux site CA-NS6

CA_NS6: MOD13A1 EVI observations at flux site CA-NS6

Description

Usage

Arguments

Format