Field | Stage | UAV DOMs | Date | Number of plots | Measured Chl content |
|---|
Min | Max | Mean | SD | COV |
|---|
Field A | S1 | √ | 29 July 2015 | 51 | 25.41 | 34.32 | 30.24 | 1.88 | 6.2% |
S2 | √ | 13 August 2015 | 51 | 28.07 | 38.43 | 32.86 | 2.45 | 7.4% |
S3 | √ | 31 August 2015 | 51 | 31.18 | 46.18 | 39.79 | 3.03 | 7.6% |
S4 | √ | 17 September 2015 | 42 | 7.78 | 33.34 | 20.07 | 5.28 | 26.3% |
S5 | – | 28 September 2015 | 11 | 10.59 | 27.89 | 19.77 | 5.42 | 27.4% |
Field B | S1 | – | 29 July 2015 | 76 | 23.49 | 40.80 | 30.57 | 2.91 | 9.5% |
S2 | – | 13 August 2015 | 76 | 23.05 | 38.10 | 31.25 | 3.48 | 11.2% |
S3 | – | 31 August 2015 | 76 | 30.65 | 48.64 | 39.94 | 4.59 | 11.5% |
S4 | – | 17 September 2015 | 76 | 17.09 | 45.93 | 31.7 | 6.62 | 20.9% |
S5 | – | 28 September 2015 | 66 | 9.57 | 50.57 | 27.44 | 8.76 | 31.9% |
- DOM: digital orthophoto map. SD: standard deviation. COV: coefficient of variation. The soybean leaf Chl content was measured using a Dualex 4 scientific portable sensor. The Chl content measured by the Dualex 4 is given in µg/cm2 in the range of 5–80 µg/cm2 (see https://www.force-a.com/products/dualex). However, in many studies, the unit of Chl measured by the Dualex 4 is marked as “Dualex units” (see [62,63,64]); thus, we also used “Dualex units” instead of µg/cm2 for the soybean leaf Chl content dataset. Min, Max, and Mean represent the minimum, maximum, and average Chl contents, respectively. The number of sampling plots is different since some plots containing early-maturing varieties were harvested during stages S4 and S5. “√” indicates that UAV-based canopy spectral images were collected and “-” indicates that UAV-based canopy spectral images were not collected. Most of the plant plots in Field A were harvested during stages S4 and S5. This is due to the fact that early- and late-maturing varieties were planted in Field A and Field B, respectively
