## Materials and Methods
### Remotely Sensed Data
#### 2.2.2 WorldView-3 and RapidEye Satellite Imagery  
WorldView-3 (WV) imagery is useful for fine-scale habitat mapping, due to its high-spatial and spectral resolution; each image has eight visible and near-infrared bands (1.24-m spatial resolution) and a panchromatic band (0.31-m at nadir) (Table 2). Compared to most multispectral satellites, the addition of four bands (coastal, yellow, red-edge, and near-infrared II) in both WorldView-2 and 3 allow for improved accuracy in mapping wetland vegetation [(36; 37)]. While WorldView-3 has the same spectral bands as WorldView-2, it is in a lower orbit, leading to increased spatial resolution (0.31m panchromatic, 1.24 m multispectral for WV-3 vs. 0.46 m pan, 1.86m multispectral for WV-2). Considering commercially available imagery, WV-3 has the finest spatial resolution in the world. WorldView-3 has a revisit rate of 4.5 days and pointing capability for daily revisits. A WorldView-3 image was acquired from DigitalGlobe [(38)] on 31 October 2017 at 16:14:35 UTC approximately 1 h after low-tide. The tidal state at the time of image acquisition was +0.22 m above the Mean Lower Low Water (MLLW) tidal datum, defined as the average minimum water level across all tidal days [(35)]. Harmonic tide predictions were taken from the National Oceanic Atmospheric Administration [(35)] for the Beaufort, North Carolina reference station (CO-OPS Station ID: 8656483; 34\({}^{\circ}\)43.2\({}^{\prime}\)N, 76\({}^{\circ}\)40.2\({}^{\prime}\)W).  
RapidEye (RE) has a coarser spatial resolution of five meters with only five bands: blue, green, red, red-edge, and near-infrared (Table 2). However, similarly to WorldView-3, RapidEye has an extra red-edge band, compared to conventional Blue-Green-Red-Near Infrared sensors, that allows for improvements in land cover classification [(39)] as well as wetland mapping [(40)]. Despite the reduced spatial and spectral resolution compared to WorldView-3, the revisit time for RapidEye is similar (5.5 days) with pointing capability for daily imaging. Due to five identical RapidEye satellites, their imagery archive is near daily even without pointing. Importantly, for small study regions (<10,000 km\({}^{2}\)) the archive can be more accessible for researchers and conservation groups through Planet's Education and Research Program [(41)]. A RapidEye level 3A image was acquired on 20 July 2017 at 16:04:21 UTC approximately 30 min after low-tide. Level 3A images are already  
\begin{table}
\begin{tabular}{c c c} \hline \hline  & **WorldView-3** & **RapidEye** \\ \hline Imagery Details & & \\ Spatial Resolution (m) & 1.24 & 5.0 \\ Radiometric Resolution & 11 bit & 12 bit \\ Revisit Rate & 4.5 days & 5.5 days \\ Revisit Rate (off-nadir) & Daily & Daily \\ Date of Acquisition & 31 October 2017 & 20 July 2017 \\ Time of Acquisition & 16:14:35 UTC & 16:04:21 UTC \\ Tidal State (m \textgreater{} MLLW) & 0.22 & -0.07 \\ Bands (nm) & & \\ Coastal Blue & 400–450 & - \\ Blue & 450–510 & 440–510 \\ Green & 510–580 & 520–590 \\ Yellow & 585–625 & - \\ Red & 630–690 & 630–685 \\ Red Edge & 705–745 & 690–730 \\ NIR 1 & 770–895 & 760–850 \\ NIR 2 & 860–1040 & - \\ Panchromatic & 450–800 & - \\ \hline \hline \end{tabular}
\end{table}
Table 2: WorldView-3 and RapidEye sensor specifications and acquisition characteristics for data analyzed in this study. Note that there are five identical RapidEye satellites, turning their 5.5 day revisit time into a nearly daily revisit for many sites. WorldView-3 only acquires imagery when tasked, in practice leading to a much thinner image archive. Additional WorldView satellites do exist, though with slightly varying capabilities and orbits. Tidal state is reported as meters above the Mean Lower Low Water (MLLW) tidal datum, defined as the average minimum water level across all tidal days [(35)].  
orthorectified and radiometrically/geometrically corrected. At the time of image acquisition, the tidal state for the RapidEye image was at -0.07 m MLLW ([PERSON], 2015); a similar tidal state to the WorldView-3 image.