20240517 10122100 1.0 TRUE FeatureToRaster DC_Trees_all_srz_2023 ORIG_FID C:\Users\Kevin\Documents\ArcGIS\Projects\DC_Trees\DC_Trees.gdb\SRZ_web_2023 1 CopyMultiple "C:\Users\Kevin\Documents\ArcGIS\Projects\DC_Trees\DC_Trees.gdb\CRZ_web_2023 RasterDataset;C:\Users\Kevin\Documents\ArcGIS\Projects\DC_Trees\DC_Trees.gdb\SRZ_web_2023 RasterDataset" C:\Users\Kevin\Documents\ArcGIS\Projects\DC_Trees\CRZ_SRZ_data_2023.gdb CRZ_web_2023;SRZ_web_2023 "CRZ_web_2023 RasterDataset CRZ_web_2023 #;SRZ_web_2023 RasterDataset SRZ_web_2023 #" Rename C:\Users\Kevin\Documents\ArcGIS\Projects\DC_Trees\CRZ_SRZ_data_2023.gdb\SRZ_web_2023 C:\Users\Kevin\Documents\ArcGIS\Projects\DC_Trees\CRZ_SRZ_data_2023.gdb\Structural_Root_Zone RasterDataset 150000000 5000 ItemDescription Dataset estimates the Structural Root Zones of trees in the District of Columbia. Trees are modeled using an automated feature extraction process applied to 2022 LiDAR data. All data is an estimate, and intended for general representation purposes. <DIV STYLE="text-align:Left;"><DIV><P><SPAN>The dataset is the estimate of a tree’s structural root zone, which must not be impacted during construction. Buffer distances are calculated for trees on all land types in the District that will be used for tree preservation planning purposes.</SPAN></P><P><SPAN>DC 2022 LiDAR was used and processed using the “Extract Trees using Cluster Analysis” script which is included as part of Esri’s 3D Basemap solution. </SPAN></P><P><SPAN>The extracted tree data set was merged with the UFA tree inventory data, with preference given to the UFA tree inventory data. All LiDAR-derived trees within 2 meters of a UFA tree were removed as being duplicates. </SPAN></P><P><SPAN>Tree diameter (DBH, in inches) was estimated for the LiDAR-derived trees from calculated tree height (in feet) based on the equation: DBH = 0.4003*height - 1.9557. This equation was derived from a statistical analysis of a detailed park inventory tree data set and has an R^2 = 0.7418.</SPAN></P><P><SPAN>Extreme outliers were also modified, with any DBH larger than 80 inches being converted to a DBH of 80 inches.</SPAN></P><P><SPAN>Critical Root Zone (CRZ) was calculated as a buffer of 1.5 feet for every inch of DBH, whereas Structural Root Zone (SRZ) was calculated as a buffer of 0.5 feet for every inch of DBH.</SPAN></P></DIV></DIV> DDOT Urban Forestry Structural_Root_Zone Root Zone CRZ SRZ Tree Preservation Tree Protection UFA DDOT Urban Forestry Division 20240517