POSTER Session 3

FEASIBILITY OF PLANETSCOPE SUPERDOVE CONSTELLATION FOR AQUATIC SCIENCE AND APPLICATIONS

PlanetScope SuperDove (SD) sensors are collecting eight spectral bands (six visible, one red-edge and one near-infrared (NIR) band) images at high spatial (~ 3 m) and temporal resolutions (~ daily). The yellow (610 nm) and red edge (705 nm) bands of SD are aligned closely with spectral signatures critical in monitoring cyanobacteria blooms (cyanoHABs), making them a viable option for aquatic science and applications. For reliable and consistent uses of SD observations, they must undergo a meticulous calibration and validation process. This work cross-calibrate SD sensors with Sentinel-2 (S2) using near-simultaneous observations over aquatic calibration sites. Specifically, we cross-compare the SD sensors’ top-of-atmosphere (TOA; Rhot ) reflectance product to S2 (six common bands – 443, 490, 565, 665, 705, 865 nm) over bodies of water and obtain calibration coefficients. Furthermore, we exploit the ACOLITE atmospheric correction processor to compare remote sensing reflectance (Rrs ) products of SD and S2. Overall, we found that the SD-S2 median differences in Rhot are ~ 2% for the visible bands, where the 443 nm band showed the lowest difference of ~ 0.5% and the highest ~ 2% difference was found in the 665 nm band. ACOLITE-derived SD Rrs appeared brighter than S2 for all the investigated bands. The median differences were ~ 5% for the 565 nm band, whereas the 443 nm band showed ~ 50% median difference. Finally, we will demonstrate several time-series analyzes focused on select episodic events, such as hurricanes, wildland fires, and accidental discharges, across the continental U.S.

Sakib Kabir, Science Systems and Applications Inc. (SSAI) and NASA Goddard Space Flight Center, USA, [email protected]

Nima Pahlevan, Science Systems and Applications Inc. (SSAI) and NASA Goddard Space Flight Center, USA, [email protected]

Arun M. Saranathan, Science Systems and Applications Inc. (SSAI) and NASA Goddard Space Flight Center, USA, [email protected]

Akash Ashapure, Science Systems and Applications Inc. (SSAI) and NASA Goddard Space Flight Center, USA, [email protected]

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