Science Tree Canopy Cover Standard Error | Multi-Resolution Land Characteristics (MRLC) Consortium

Because of the federal government shutdown, MRLC.gov is not being updated and the agency will not be able to respond to inquiries until appropriations are enacted. For more information please visit: https://www.doi.gov/shutdown.

We are currently experiencing intermittent issues with https://www.mrlc.gov/data. For guidance on alternative data outlets, please click here.

While each Science Tree Canopy Cover (TCC) pixel has a mean predicted value for each year, it also has a standard deviation of the predicted values from all regression trees (we refer to this as standard error). To provide a depiction of the variability of expected model error we simulated a model error statistic referred to as tau, following guidance from Coulston et al. (2016).

For additional information regarding the creation of Science TCC Standard Error products:

https://data.fs.usda.gov/geodata/rastergateway/treecanopycover/docs/TCC_v2023-5_Methods.pdf

To view and print the PDF you must obtain and install the Acrobat® Reader, available at no charge from Adobe Systems.

Annual NLCD image of CONUS showing Validation Points

Annual NLCD Reference Data and Validation Metrics Now Available on MRLC

Published Sep 24, 2025

The U.S. Geological Survey has added a new outlet for Reference and Validation (R&V) data for Annual National Land Cover Database (NLCD) Conterminous U.S. (CU), Collection 1.0. In addition to availability on the USGS ScienceBase-Catalog, the R&V data are now hosted right here on MRLC.gov.
These R&V data provide Annual NLCD users with a statistical accuracy assessment of the land cover products, as well as the source reference data. This information helps users understand the accuracy of Annual NLCD and supports better decisions in research, land use planning, and resource management.

Review Products

Map of eastern CONUS with Ecological Potential data

RCMAP Ecological Potential Data Now Available

Published Jul 28, 2025

A new generation of RCMAP Ecological Potential (EP) vegetation cover components are now available. Rangelands have immense inherent spatial and temporal variability, yet assessments of land condition and trends are often assessed relative to the condition of a limited number of representative points or in some cases reference data for comparison is lacking. Understanding of the potential vegetation conditions of a site in an undisturbed state is invaluable for interpreting trends, disturbance impact, and restoration targets. EP was defined as the potential fractional cover of components (bare ground, herbaceous, litter, shrub, sagebrush, and tree) in the least disturbed and most productive spaces and times of western North America since 1985. This dataset enables: 1) setting realistic expectations for restoration and management targets, 2) better understanding of the extent of vegetation departure from potential and 3) improved spatial understanding of vegetation composition and productivity variation.

View Datasets

Annual NLCD image of CONUS showing land features

Annual NLCD CONUS Collection 1.1 Now Available

Published Jun 25, 2025

Land Cover Characteristics in a Suite of Six Products

Annual NLCD CU C1.1 adds 2024 to the established suite of six raster-based land use and land cover science products for the conterminous United States. It now covers the period between 1985 and 2024:

1. Land Cover
2. Land Cover Change
3. Land Cover Confidence
4. Fractional Impervious Surface
5. Impervious Descriptor
6. Spectral Change Day of Year

Review Products