InVEST: Integrated Valuation of Environmental Services and Tradeoffs
The Need for a New Tool
InVEST is a family of tools to map and value the goods and services from nature which are essential for sustaining and fulfilling human life.
If properly managed, ecosystems yield a flow of services that are vital to humanity, including the production of goods (e.g., food), life support processes (e.g., water purification), and life fulfilling conditions (e.g., beauty, recreation opportunities), and the conservation of options (e.g., genetic diversity for future use).
Despite its importance, this natural capital is poorly understood, scarcely monitored, and, in many cases, undergoing rapid degradation and depletion.
InVEST enables decision-makers to assess the tradeoffs associated with alternative choices and to identify areas where investment in natural capital can enhance human development and conservation in terrestrial, freshwater, and marine ecosystems.
Questions InVEST can Answer
How will a new coastal management plan impact seafood harvest, renewable energy production, and protection from storms?
Conservation organizations can use InVEST to align their missions to protect biodiversity with activities that improve human livelihoods.
Where would reforestation or protection achieve the greatest downstream water quality benefits?
Corporations, such as bottling plants, timber companies, and water utilities, can use InVEST to decide how and where to make investments to protect their supply chains.
Which parts of a watershed provide the greatest carbon sequestration, biodiversity, and tourism values?
Government agencies can use InVEST to help determine how to manage lands and waters to provide an optimal mix of benefits to people or to help design permitting and mitigation programs that sustain nature's benefits to society.
Who Should Use InVEST
Governments, non-profits, and corporations manage natural resources for multiple uses and inevitably must evaluate trade-offs among these uses; InVEST's multi-service, modular design provides an effective tool for evaluating these trade-offs.
How it Works
InVEST is most effectively used within a decision-making process that starts with stakeholder consultations.
Through discussion, questions of interest, management choices, and/or policy options are identified.
Stakeholders develop spatial "scenarios" to show, for example, several alternative areas where fishing might be prohibited, where agricultural land might be converted to residential development, or where climate change is expected to affect precipitation and temperature patterns.
Scenarios typically include maps of potential future land use/land cover and/or marine habitats and ocean uses. These are critical inputs in all InVEST models.
Following stakeholder consultations and scenario development, InVEST can estimate how the current location, amount, delivery, and value of relevant services are likely to change in the future.
InVEST models are spatially-explicit, using maps as information sources and producing maps as outputs. InVEST returns results in either biophysical terms (e.g., tons of carbon sequestered) or economic terms (e.g., net present value of that sequestered carbon).
The spatial resolution of analyses is also flexible, allowing users to address questions at the local, regional or global scales.
InVEST results can be shared with the stakeholders and decision-makers who created the scenarios to inform upcoming decisions. Using InVEST in an iterative process, these stakeholders may choose to create new scenarios based on the information revealed by the models until suitable solutions are identified.
InVEST models are based on production functions that define how an ecosystem's structure and function affect the flows and values of environmental services. The models account for both service supply (e.g. living habitats as buffers for storm waves) and the location and activities of people who benefit from services (e.g. location of people and infrastructure potentially affected by coastal storms).
Since data are often scarce, the initial versions of InVEST offer relatively simple models with few input requirements. These models are best suited for identifying patterns in the provision and value of environmental services. With validation, these models can also provide useful estimates of the magnitude and value of services provided.
InVEST models can be run independently, or as script tools in the ArcGIS ArcToolBox environment. You will need a mapping software such as QGIS or ArcGIS to view your results. Running InVEST effectively does not require knowledge of Python programming, but it does require basic to intermediate skills in ArcGIS.
The tool is modular in the sense that you do not have to model all the environmental services listed, but rather can select only those of interest.
The User's Guide steps you through installing and running the tools, provides some of the theory behind each model and describes the input data requirements and how to interpret output results. A set of sample data is also supplied so that you can use to get to know the models and how they work.
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