Adaptation of the EnMAP Level 2A land product to water

Kurzfassung

EnMAP data are available as top-of-atmosphere Level-1 product in radiance units, and as bottom-of-atmosphere Level-2 product in reflectance units. The conversion from Level-1 to Level-2 is performed using two different atmospheric processors: PACO, which is applied to both land and water pixels, and MIP, which is used exclusively for water pixels. Both correct for adjacency effects, which can be quite large over dark water. The PACO product has been validated over land (de los Reyes et al., 2020) and used extensively for terrestrial applications, and correspondingly the MIP product was validated for water (Soppa et al., 2024) and used frequently for aquatic applications. However, the PACO product over water is rarely used because it is primarily designed for land and does not account for specular reflections; thus, PACO is not validated for water. A novel tool has been developed for the open-source software WASI for adapting land atmospheric correction to water by correcting the reflections at the water surface. It has been applied to PACO products from water, and the results are compared with the MIP product and validated using in-situ measurements.