Demeter is a fully extensible, community-based land use land cover (LULC) downscaling and change detection model that allows for customization and/or additions from its user base. The model was created to generate high-resolution gridded time series representations of LULC projections from global, national, and regional models. The downscaling is based on a number of user-defined rules and drivers, including transitions priorities (i.e., crop expansion preferentially into grasslands rather than forests) and spatial constraints (e.g., nutrient availability). Demeter downscales land allocation projections for a region and/or zone to the resolution of the observed spatial data (MODIS, NLCD, etc.) using an intensification and expansion process applied to each LULC type. Land classes from both the observed and projected data are harmonized by a user-defined binning of each class into the desired output LULC types. Continued model development is underway that will accommodate expanded output formats to enable coupling with the Soil and Water Assessment Tool (SWAT), the Community Land Model (CLM), and others. Integration with the Community Surface Dynamics Modeling System (CSDMS) is also underway by wrapping Demeter in a Basic Model Interface (BMI) to allow for component-based coupling.