## 2 Materials and Methods
### Remotely Sensed Data Collection and Pre-Processing  
The UAV images were acquired on 10-11 August 2019 under clear-sky conditions from 11:00 a.m. to 2:00 p.m. local time, using a multispectral sensor RedEdge M (Micasense, Seattle, Washington, USA), boarded on a quadcopter G-Q45 (G-drones, Sao Paulo, Brazil). The RedEdge M sensor collected information on the blue (B) (465-485 nm), green (G) (550-570 nm), red (R) (663-673 nm), red-edge (RE) (712-722 nm), and near-infrared (NIR) (820-860 nm) spectral bands (Figure 2). We used 75% image overlap and side-lap. The automatic flight control system maintained the UAV at 115 m aboveground over parallel paths, resulting in a ground sample distance (GSD) of ~0.08 m. We captured images from the calibration panel (Micasense) before and after each flight for the image radiometric corrections. A manufacturer conversion model transforms raw pixel values to absolute spectral radiance values, considering the radiometric sensor resolution. The calibration panel images enable computing the reflectance calibration factor for each band by calculating the ratio between the known reflectance value of the calibration panel from the manufacturer and the average radiance for pixels inside the panel. We used the Agisoft  
Figure 1: Location of the study area in the western region of the state of São Paulo, Brazil, and the UAV orthomosaic (true colour composite red-green-blue (RGB):321) of the study area in August 2019. The selected PlanetScope (PS) CubeSat multispectral cloud-free image was acquired on 10 August 2019, and downloaded from the Brazilian Planet Labs commercial representative platform. The PS is a constellation of nanosatellites, comprising over 130 CubeSats 3U form factors (0.10 m \(\times\) 0.10 m \(\times\) 0.30 m) operated by Planet Labs, Inc., able to provide a daily image of all of the Earth's land surface at high spatial resolution (\(\sim\)3 m). Most PS CubeSats are in a sun-synchronous orbit with an equator crossing time between 9:30 and 11:30 a.m. (local solar time). The PS image used in our study was acquired by the Bayer Mask CCD sensor with four spectral bands (Figure 2): B (455-515 nm), G (500-590 nm), R (590-670 nm), and NIR (780-860 nm) [27]. We used the Planet Surface Reflectance (SR) product, which was atmospherically corrected using coefficients supplied with the Planet Analytic Product (Radiance), processed to the top of the atmosphere (TOA) and the 6 SV2.1 radiative transfer code [28]. The cloud-free Sentinel-2A image (Level-2A surface reflectance product) selected for this study was acquired on 11 August 2019. Sentinel-2 (S2) is a satellite mission of the Copernicus program from the European Space Agency (ESA) based on two polar-orbiting satellites (Sentinel-2A and Sentinel-2B) positioned in the same sun-synchronous orbit phased at 180\({}^{\circ}\) to each other. Each S2 satellite carries a MultiSpectral Instrument (MSI), and together they can image all of the Earth's land surface at a revisit time of 5 days with a 290 km swath width. S2 images are publicly accessible and can be freely downloaded at the Copernicus website ([[https://scihub.copernicus.eu/dhus/#/home](https://scihub.copernicus.eu/dhus/#/home)]([https://scihub.copernicus.eu/dhus/#/home](https://scihub.copernicus.eu/dhus/#/home)) (accessed on 1 May 2020)). The MSI sensor captures 13 spectral bands with varying spatial resolutions (10 m, 20 m, and 60 m). The spectral bands with 10 m spatial resolution are B (459.4-525.4 nm), G (541.8-577.8 nm), R (649.1-680.1 nm), and NIR (779.8-885.8 nm). Red-edge1 (RE1) (696.6-711.6 nm), red-edge2 (RE2) (733-748 nm), red-edge3 (RE3) (772.8-792.8 nm), red-edge4 (RE4) (854.2-875.2 nm), shortwave infrared 1 (SWIR1) (1568.2-1659.2 nm), and shortwave infrared 2 (SWIR2) (2114.9-2289.9 nm) correspond to the spectral bands with 20 m resolution (Figure 2). This study did not consider the three bands with 60 m resolution designed for monitoring atmospheric conditions (coastal aerosol, water vapor, and SWIR/Cirrus).