Disaggregation of legacy soil data using area to point kriging for mapping soil organic carbon at the regional scale

► Determining ways to disaggregate and use legacy data in regression kriging (RK). ► Area to point kriging (AtoP) is used to disaggregate legacy data from polygon maps. ► Using legacy data disaggregated by simple rasterization in RK reduces errors. ► Using AtoP disaggregated legacy data in RK reduces errors further. ► As few as 300 samples can be used to map soil organic matter for all Northern Ireland.