Description: <p>The TreeMap data was downloaded from <a href="https://www.fs.usda.gov/rds/archive/Catalog/RDS-2021-0074">https://www.fs.usda.gov/rds/archive/Catalog/RDS-2021-0074</a>. TreeMap data was chosen since aboveground carbon was able to be aggregated at a fireshed scale. Data provided is a 30X30 meter spatial resolution tree-level model of forests shown as a raster map for the conterminous U.S. circa 2016. A random forests machine-learning algorithm was used to impute forest plot data from Forest Inventory and Analysis (FIA) to a set of target rasters that were provided by <a href="https://landfire.gov/">Landscape Fire and Resource Management Planning Tools</a>.</p><p>A new aboveground carbon field (CARBON_Total) in tons per acre was calculated by adding attribute fields CARBON_L (Carbon, live above ground), CARBON_D (Carbon, standing dead), and CARBON_DWN (Carbon, dead down >3” diameter and stumps and roots >3” diameter). These were all provided as tons per acre. CARBON_D contained values of -99 for some plots which indicates null values equivalent to no standing dead trees; these were converted to zero values. A Lookup geoprocessing tool was run to isolate the CARBON_Total field from the rest of the attributes for further processing. Zonal Statistics by Table were run to gather basic statistics on CARBON_Total using a western US Forest Service firesheds layer as the feature zone and FIRESHED_ID field as the Zone Field. Ignore No Data in calculations was selected for this process. This allowed for the statistics to be calculated for the CARBON_Total pixel values that fall within each NFS west fireshed. The resulting table was then joined to the original western US Forest Service firesheds layer and displayed as an average of CARBON_Total (tons per acre) symbolized in 4 categories with an emphasis on those firesheds that have average aboveground carbon in tons per acre in the upper quartile.</p><p>Aboveground carbon does not include litter, duff, downed woody material <=3” in diameter, soils, or below ground carbon.</p>
Copyright Text: Original data from TreeMap 2016: A tree-level model of the forests of the conterminous United States circa 2016 (Riley et al.) https://doi.org/10.2737/RDS-2021-0074. Published by: USDA Forest Service Geospatial Technology and Applications Center.