Explore GTAC

Geospatial Technology Supporting Forest Management

You don't need a map to explore GTAC -- but you'll find one around every corner! At the Geospatial Technology and Applications Center (GTAC), we advance the Forest Service mission through the application of new geospatial science, technology, and methods to meet business requirements. On the Explore GTAC page, you can learn more about the work we do at GTAC by reading stories about what we do.

Visualizing the Changing American Landscape

Online App Provides National Landscape Change Time-Lapse Imagery

Interested in how our national landscape changes over time? In February 2021, USDA Forest Service has released its expanded online Landscape Change Monitoring System (LCMS), a publicly available dataset that combines remote sensing products (including Landsat imagery) with reference data to create meaningful spatial data products such as time-lapses showing annual vegetation change, land cover, and land use. The release, developed by staff at the agency's GTAC in Salt Lake City, greatly expands LCMS's coverage to include the entire continental United States and South and East Coastal Alaska. The update also adds 5 new data layers covering 1985 to present.

> Learn more

“We are thrilled to announce the release of the new LCMS Data Explorer, which leverages work accomplished by a diverse science team composed of Forest Service researchers, academia, and other government organizations. The data set's increased geographic coverage allows agency and public users to view, analyze, summarize, and download extensive imagery data showing landscape changes over time across the nation,” said Deb Oakeson, GTAC Director.

Prior to the latest release, the LCMS data covered only Region 4 (the Intermountain Region) of the National Forest System plus four other national forests. In addition, the updated LCMS Data Explorer offers new kinds of data.

“In addition to the original Vegetation Loss data layer, users can now use LCMS to analyze Vegetation Gain, Land Cover, Land Use, Fast Loss, and Slow Loss data layers,” said Kevin Megown, GTAC's Program Lead for Resource Mapping, Inventory and Monitoring. Megown oversees the GTAC team that updates and improves LCMS data, visualization tool, and user support.

How is LCMS data used? GTAC's online LCMS Data Explorer was originally developed to leverage USFS research to visualize the process of change across a landscape. (Link to time-lapse example on the Rocky Mountain Research Station's website). Managers then used it to make informed decisions for future management. For example, Forest Service regional and forest-level staffs have helped identify many applications for LCMS data including forest planning and revision, updating existing vegetation maps, assessing landscape conditions, supporting post-fire recovery, Forest Service Activity Tracking System (FACTS) analysis, disturbance tracking, and meeting broad-scale monitoring requirements.

The history of federal forest management dates to 1876 when Congress recognized the need for oversight of the quality and conditions of forests throughout the country. This foresight has evolved into today's Forest Service, with a mission firmly rooted in sustaining the health, diversity, and productivity of the nation's forests and grasslands to meet the needs of present and future generations.

Located in Salt Lake City, UT, GTAC provides leadership in geospatial science implementation in the USDA Forest Service. Learn more about GTAC's mission, projects, career opportunities, and publicly available geospatial applications by visiting the center's USDA Forest Service website at https://fs.usda.gov/about-agency/gtac.

LCMS Data Viewer is Online

In 2020, the USDA Forest Service released an updated version of its Landscape Change Monitoring System (LCMS), a publicly available online tool that utilizes satellite data to generate annual maps showing vegetation change, land cover, and land use over time. The new release, developed cooperatively by the Rocky Mountain Research Station (RMRS) and the Geospatial Technology and Applications Center (GTAC), adds the 2019 data layer to the previously available layers going back to 1985. Check it out here: https://apps.fs.usda.gov/lcms-viewer/

How is GTAC's Remote Sensing Applied on Forests?

Ever wonder how our remote sensing services are applied on the National Forests? Well here is one example! The Apache-Sitgreaves National Forest incorporated remote sensing into its Forest Plan Monitoring Implementation Guide. When monitoring how management activities are affecting late successional forest structure in relation to desired conditions, foresters can document acres of late-successional structure lost or converted by uncharacteristically hot wildfires by using RAVG (Rapid Assessment of Vegetation Conditions after Wildfire) burn severity maps from GTAC. Learn more about the Forest Service's BAER program and RAVG program.