InVEST is a suite of free, open-source software models used to map and value the goods and services from nature that sustain and fulfill human life. The models are spatially-explicit, using maps as information sources and producing maps as outputs. They return results in either biophysical terms (e.g., tons of carbon sequestered) or economic terms (e.g. net present value of that sequestered carbon). InVEST models are based on production functions that define how changes in an ecosystem’s structure and function are likely to affect the flows and values of ecosystem services across a land- or a seascape.