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 "description": "<DIV STYLE=\"text-align:Left;\"><DIV><P><SPAN>The dataset is the estimate of a tree\u2019s critical root zone, which can not be impacted beyond certain limits. 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 \u201cExtract Trees using Cluster Analysis\u201d script which is included as part of Esri\u2019s 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>",
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