Potential ecosystem mapping across Otago used both existing layers and new mapping, informed by a wide range of resources including articles and reports, species distribution data, aerial imagery, and Wildland Consultants Ltd knowledge. The mapping was based on the Singers & Rogers (2014) classification of indigenous ecosystem types, modified in some cases by adding new ecosystem types (IC1) or sub-units of ecosystem types (CLF4.3). Soil data from the Fundamental Soils Layer was generally used for lowland and montane mapping, while LCDB units were generally used for mapping ecosystems above treeline. Considerable new mapping was undertaken where existing layers were deficient, particularly with respect to upland wetlands and coastal ecosystems.