20180521 16405500 1.0 TRUE This feature service is based on ESRI's USA Counties layer (<a href='https://www.arcgis.com/home/item.html?id=a00d6b6149b34ed3b833e10fb72ef47b' target='_blank'>available here</a>). Features and attributes of ESRI's layer have been adapted to match attributes within the FIA database (FIADB) and features have been generalized by removing vertices to enhance performance. This layer has been attributed with outputs from FIA's EVALIDator tool (<a href='http://apps.fs.fed.us/Evalidator/evalidator.jsp' target='_blank'>http://apps.fs.fed.us/Evalidator/evalidator.jsp</a>) for the following estimates:<ul><li>Area of sampled land and water, in acres<br /></li><li>Area of forest land, in acres</li><li>Area of timber land, in acres</li><li>Net merchantable bole volume of live trees (at least 5 inches d.b.h./d.r.c.), in cubic feet, on forest land</li><li>Average annual net growth of merchantable bole volume of trees (at least 5 inches d.b.h./d.r.c.), in cubic feet, on forest land</li><li>Average annual mortality of merchantable bole volume of trees (at least 5 inches d.b.h./d.r.c.), in cubic feet, on forest land</li><li>Average annual removals of merchantable bole volume of trees (at least 5 inches d.b.h./d.r.c.), in cubic feet, on forest land</li><li>Aboveground biomass of live trees (at least 1 inch d.b.h./d.r.c), in dry short tons, on forest land</li><li>Aboveground carbon in live trees (at least 1 inch d.b.h./d.r.c), in short tons, on forest land</li><li>Total carbon, in short tons, on forest land</li><li>Net merchantable bole volume of growing-stock trees (at least 5 inches d.b.h.), in cubic feet, on timberland<br /></li><li>Net sawlog volume of sawtimber trees, in board feet (International 1/4-inch rule), on timberland</li></ul>States without available data contain null values and will be updated as data become available.<br /><br /><div>Additional data descriptions are available in the most recent FIADB User Manual, <a href='https://www.fia.fs.fed.us/library/database-documentation/' target='_blank'>available here</a>.</div> forest inventory and analysisforest inventoryFIANRS-FIANorthern Research Stationforest landforestlandtimber landtimberlandvolumegrowthremovalsmortalitybiomasscarbon County-level Estimates of 2012 Forest and Timber Land Area, Volume, Growth, Removals, Mortality, Biomass, and Carbon derived from EVALIDator for the Forest Invenotry and Analysis Program USDA Forest Service, Forest Inventory and Analysis Program These data hosted in this gallery were created by the USDA Forest Service and can be used without additional permissions or fees.<br /><br />Information displayed in this map was derived from multiple sources. These maps are for graphic display and general analysis and reporting purposes only.<br /><br />Inquiries concerning information displayed on these maps, their sources, and intended uses should be directed to the <a href='https://www.nrs.fs.fed.us/fia/' target='_blank'>Northern Research Station's Forest Inventory and Analysis program</a>.