2 Tree-level flowering phenology

PlanetScope-derived vegetative phenology correlates with flowering phenology derived from NEON.

2.1 Data

Read NEON phenometrics data prepared in the phenology-sample-data project.

source("code/neon_data_pheno.R")
p_neon_map

Read in NEON PlanetScope data (day of year) prepared with the batchplanet package.

source("code/neon_data_ps.R")
source("code/neon_plot_data.R")
p_neon_data

2.2 Analysis

Correlation between 50% green-up time from PlanetScope and flower onset time from NEON.

source("code/neon_corr.R")
p_neon_ps_corr_flower

Correlation between leaf and flower onset time from NEON.

source("code/neon_leaf_flower.R")
p_neon_leaf_flower

Individual phenological observations extracted from PlanetScope (PS) and National Ecological Observatory Network (NEON) for wind-pollinated taxa. (A) Extraction of individual-level phenological metric from PS data, showing Enhanced Vegetation Index (black point), smoothed Enhanced Vegetation Index (green line), period of green-up (green shade), and extracted 50% green-up time (vertical green line), using two individuals at HARV and ORNL sites as examples. (B) Correlation between time of 50% green-up from PS and time of flower onset from NEON.

Figure 2.1: Individual phenological observations extracted from PlanetScope (PS) and National Ecological Observatory Network (NEON) for wind-pollinated taxa. (A) Extraction of individual-level phenological metric from PS data, showing Enhanced Vegetation Index (black point), smoothed Enhanced Vegetation Index (green line), period of green-up (green shade), and extracted 50% green-up time (vertical green line), using two individuals at HARV and ORNL sites as examples. (B) Correlation between time of 50% green-up from PS and time of flower onset from NEON.