Table 1.
Flight dates and field evaluations conducted during 2014, 2015, and 2016 airborne and field campaigns.
| Year | Field evaluation period | Flight dates hyperspectral | Date Sentinel-2 | Trees evaluated | Field assessmenta |
|---|---|---|---|---|---|
| 2014 | Nov 2014-Jan 2015 | 28/Jan/2015 | – | 252 | DEFO, DISC, DIE |
| 2015 | Nov-Dec. 2015 | 2/Dec/2015 | 29/Nov/2015 | 411 | DEFO, DISC, DIE |
| 2016 | Feb. 2016 | 411 | DEFO, DISC, DIE | ||
| June-Aug. 2016 | 20/Jun/2016 | 19/June/2016 | Tree condition/relative changeb |
Level 0 = trees without any sign of declining health; level 1 = [1–25%], level 2 = [26–50%], level 3 = [51–75%], level 4 = [76–99%], level 5 = 100%.
a
DEFO = percent of defoliation; DISC = percent of discoloration; DIE = canopy die-off.
b
The 411 trees were ranked for their relative change in tree condition between Nov. 2015 and June 2016.