An updated Continuous Airborne Mapping By Optical Translator (CAMBOT) data set: continuing and improving the Operation IceBridge nadir visible imagery legacy.

Operation IceBridge (OIB) is NASA's longest running airborne mission to monitor polar ice. Perhaps the most approachable dataset produced during this eleven-year mission is the nadir-looking visible imagery using high-resolution digital cameras. Such imagery data has been collected on nearly all OIB flights and released to the public in original and georeferenced formats. One of the camera systems that has operated since the inception of the program is the Continuous Airborne Mapping By Optical Translator (CAMBOT) system operated by the Airborne Topographic Mapper (ATM) team. Historically, data from this system were collected primarily for local context and provided to the public with minimal geolocation information. Beginning with the 2018 Arctic spring campaign, significant upgrades were made to the ATM's CAMBOT system permitting it to become the primary camera operated by OIB. We show that these new ATM CAMBOT data can be georeferenced to an accuracy comparable to or better than previously deployed airborne nadir-looking cameras. We have also incorporated additional improvements, such as using state-of-the-art digital elevation models during the orthorectification and georeferencing process. The goal of the OIB Project Science Office and the ATM team and is to produce a visible imagery product of maximum value to end-user scientists and enabling a seamless transition between this system and previous ones for existing workflows that leverage this imagery.