i-Tree Eco: Application Overview
Eco v6 is a model that uses tree measurements and other data to estimate ecosystem services and structural characteristics of the urban or rural forest. Eco is a complete package that provides:
- Sampling and data collection protocols - For plot-based sample projects, total population estimates and standard error of estimates are calculated based on sampling protocols. For complete inventories, eco calculates values for each tree.
- Flexible data collection options – Use the mobile data collection system with web-enabled smartphones, tablets or traditional paper sheets.
- Automated processing - A central computing engine that makes estimates of the forest effects based on peer-reviewed scientific equations to predict environmental and economic benefits.
- Reports - Summary reports that include charts, tables and a written report.
Eco model basics
How does Eco work?
Tree measurements and field data are entered into the Eco application either by web form or by manual data entry, they are merged with local pre-processed hourly weather and air pollution concentration data. These data make it possible for the model to calculate structural and functional information using a series of scientific equations or algorithms. Refer to technical documents in the Resources – Archives section for model descriptions.
Tree data and model function relationships
Although Eco v6 has been modified so users have flexible tree measurement options, tree measurements are critical for the model to estimate ecosystem services and values as shown below. Therefore, the quality and accuracy of results can be improved significantly by collecting recommended measurements in addition to species and DBH data. The Eco v6 model will use regression equations to estimate missing tree measurements and model results will be less accurate.
- Refer to the Data Variables - Ecosystem Services Relationships descriptions and the Eco Data Limitations guide for important information related to tree measurements and model function.
The new forecast module can be run after Eco results are generated. Forecast uses structural estimates, environmental and location variables, species characteristics along with growth and mortality rates to forecast future tree DBH and crown size. Forecasted benefits such as pollution removal, carbon storage and carbon sequestration are then estimated based on the projected tree growth and leaf area. Tree planting inputs, pest and disease impacts and storm effects can be modeled also. Refer to the Forecast Model Guide for instructions.
What does the Eco Model estimate?
i-Tree Eco is currently designed to provide estimates of:
- Urban forest structure - Species composition, number of trees, tree density, tree health, etc.
- Pollution reduction - Hourly amount of pollution removed by the urban forest, and associated percent air quality improvement throughout a year. Pollution removal is calculated for ozone, sulfur dioxide, nitrogen dioxide, carbon monoxide and particulate matter 2.5 (<2.5 microns).
- Public health impacts – Health incidence reduction and economic benefit based on the effect of trees on air quality improvement for the United States only.
- Carbon - Total carbon stored and net carbon annually sequestered by the urban forest.
- Energy Effects - Effects of trees on building energy use and consequent effects on carbon dioxide emissions from power plants.
- Avoided runoff - Yearly avoided runoff attributed to trees summarized by tree species or strata.
- Forecasting - Models tree and forest growth over time; considers factors like mortality rates, tree planting inputs, pest and disease impacts and storm effects. Some ecosystem services including carbon and pollution benefits are also forecasted.
- Bio-emissions - Hourly urban forest volatile organic compound emissions and the relative impact of tree species on net ozone and carbon monoxide formation throughout the year.
- Values - Compensatory value of the forest, as well as the estimated economic value of ecosystem services.
- Potential pest impacts - based on host susceptibility, pest/disease range and tree replacement value.
All reporting options may not be available depending on project configuration, data options and project country location.