{"@type": "dcat:Dataset", "accessLevel": "public", "contactPoint": {"@type": "vcard:Contact", "fn": "DCGISgroup", "hasEmail": "mailto:gisgroup@dc.gov"}, "description": "The dataset is the estimate of a tree\u2019s 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.<div><p><a href='https://opendata.dc.gov/datasets/da0c156ef3d24607b27a0da418970eac/explore' target='_blank' rel='nofollow ugc noopener noreferrer'>DC 2022 LiDAR</a><span>\u00a0was used and processed using the \u201cExtract Trees using Cluster Analysis\u201d script which is included as part of Esri\u2019s 3D Basemap solution.</span>\u00a0</p><p>The\nextracted tree data set was merged with the UFA tree inventory data, with\npreference given to the UFA tree inventory data. All LiDAR-derived trees within\n2 meters of a UFA tree were removed as being duplicates.\u00a0<br /></p>\n\n<p>Tree\ndiameter (DBH, in inches) was estimated for the LiDAR-derived trees from\ncalculated tree height (in feet) based on the equation: DBH = 0.4003*height -\n1.9557. This equation was derived from a statistical analysis of a detailed\npark inventory tree data set and has an R^2 = 0.7418.</p><p>Extreme\noutliers were also modified, with any DBH larger than 80 inches being converted\nto a DBH of 80 inches.<br /></p><p>Critical\nRoot Zone (CRZ) was calculated as a buffer of 1.5 feet for every inch of DBH,\nwhereas Structural Root Zone (SRZ) was calculated as a buffer of 0.5 feet for\nevery inch of DBH.<br /></p><br /></div>", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://opendata.dc.gov/datasets/DCGIS::dc-estimated-tree-root-zone-structural", "format": "Web Page", "mediaType": "text/html", "title": "ArcGIS Hub Dataset"}, {"@type": "dcat:Distribution", "accessURL": "https://imagery.dcgis.dc.gov/dcgis/rest/services/UFD/Structural_Root_Zone/ImageServer", "format": "ArcGIS GeoServices REST API", "mediaType": "application/json", "title": "ArcGIS GeoService"}], "identifier": "https://www.arcgis.com/home/item.html?id=cb0ad20bf01a456987a57e1eef0fff4c", "issued": "2020-11-23T15:10:36.000Z", "keyword": ["Root Zone", "CRZ", "SRZ", "Tree Preservation", "Tree Protection", "UFA", "DDOT Urban Forestry Division"], "landingPage": "https://opendata.dc.gov/datasets/DCGIS::dc-estimated-tree-root-zone-structural", "license": "https://creativecommons.org/licenses/by/4.0", "modified": "2025-04-09T15:04:08.000Z", "publisher": {"name": "City of Washington, DC"}, "spatial": "-77.1195,38.8032,-76.9095,38.9957", "theme": ["geospatial"], "title": "DC Estimated Tree Root Zone (Structural)"}