The Atmospheric Correction Intercomparison eXercise (ACIX) is a collaborative initiative within the Committee on Earth Observation Satellites Working Group on Calibration & Validation (CEOS WGCV), coordinated between ESA and NASA. ACIX invites the community of Atmospheric Correction (AC) processor developers to generate Bottom-Of-Atmosphere (BOA) products. Following the successful completion of previous iterations focussing on multispectral input imagery (see the ACIX-I and ACIX-II web pages), ACIX-III Land aims to provide a comprehensive assessment of state-of-the-art atmospheric correction processors for hyperspectral data from EnMAP and PRISMA sensors acquired over land surfaces.

By adhering to community-established guidelines, this exercise facilitates a rigorous comparison of algorithms across various land cover types and atmospheric conditions, including scenes over deserts, ice, urban areas, forest and agriculture. Through this comparative analysis, ACIX-III Land seeks to identify the strengths, weaknesses, and areas for improvement in existing algorithms. The insights gained from this exercise will be instrumental in refining atmospheric correction techniques, establishing standardized protocols for intercomparison, and preparing the scientific community for future hyperspectral missions.

The ACIX-III Land timeline is presented below with the main steps and goals of the projects.