The impervious descriptor is an accompanying product to the impervious estimate. It contains a label for each percent impervious estimate of road type, urban area type, and energy production sites. These are meant to provide additional information to the impervious estimates by allowing distinction or separation of these different types of impervious and developed usage.
Published Aug 02, 2021
RCMAP has released temporal trends for the 1985-2020 fractional component cover time-series. Temporal patterns in each RCMAP component were evaluated with two approaches, 1) linear trends and 2) a structural change method using a temporal moving window to detect “breaks” and “stable states” in pixel values. The structural change method partitions the time-series into segments of similar slope values, with statistically significant break-points indicating perturbations to the prior trajectory. We provide the following statistics: 1) for each component, each year, the presence/absence of breaks, 2) the slope, p-value, and standard error of the segment occurring in each year, 3) the overall model R2 (quality of model fit to the temporal profile), and 4) an index, Total Change Intensity, reflecting the total amount of change occurring across components in that pixel.
Published Mar 25, 2021
The MRLC Consortium, in collaboration with NOAA and the USGS, is pleased to release version 2 of the Enhanced Visualization and Analysis (EVA) tool. This tool provides users with detailed county statistics for any two NLCD landcover dates to support quick and powerful change analyses. This tool was originally developed by NOAA and shared through the consortium with custom adaptations for NLCD.
Published Jun 03, 2021
The NLCD 2019 suite of Conterminous U.S. (CONUS) land cover and impervious products have now been released. This release includes eight epochs of land cover (2001, 2004, 2006, 2008, 2011, 2013, 2016, and 2019), a 2001 – 2019 land cover change index, and sixteen urban imperviousness datasets - a percent imperviousness and classified imperviousness matching all years of land cover . The NLCD 2019 and 2021 products for tree canopy cover will be released in the next year. RCMAP rangeland fractional component data including a 1985-2020 time-series, projections of future component cover through the 2080s, and Ecological Potential component cover are also currently available.