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DC Estimated Trees
Dataset
estimates location and size of trees in the District of Columbia that are not
managed by the Urban Forestry Division (https://opendata.dc.gov/datasets/urban-forestry-street-trees/explore).
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.
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. All LiDAR-derived trees within 2 meters of a
Urban Forestry Division tree were removed as being duplicates.
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.
Extreme
outliers were also modified, with any DBH larger than 80 inches being converted
to a DBH of 80 inches.
Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| contactPoint |
{
"fn": "DDOThub",
"@type": "vcard:Contact",
"hasEmail": "mailto:gisgroup@dc.gov"
}
|
| description | <p style='margin-bottom:9pt; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;'><span style='font-size:12.0pt; font-family:"Avenir Next",serif; color:black;'>Dataset estimates location and size of trees in the District of Columbia that are not managed by the Urban Forestry Division (<a href='https://opendata.dc.gov/datasets/urban-forestry-street-trees/explore' rel='nofollow ugc'>https://opendata.dc.gov/datasets/urban-forestry-street-trees/explore</a>). 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.</span></p> <p style='margin-bottom:9pt; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;'><span style='font-size:12.0pt; font-family:"Avenir Next",serif; color:black;'><a href='https://opendata.dc.gov/datasets/da0c156ef3d24607b27a0da418970eac/explore' target='_blank' rel='nofollow ugc noopener noreferrer'>DC 2022 LiDAR</a> was used and processed using the “Extract Trees using Cluster Analysis” script which is included as part of Esri’s 3D Basemap solution. All LiDAR-derived trees within 2 meters of a Urban Forestry Division tree were removed as being duplicates.</span></p> <p style='margin-bottom:9pt; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;'><span style='font-size:12.0pt; font-family:"Avenir Next",serif; color:black;'>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 style='margin-bottom:9pt; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;'><span style='font-size:12.0pt; font-family:"Avenir Next",serif; color:black;'>Extreme outliers were also modified, with any DBH larger than 80 inches being converted to a DBH of 80 inches.</span></p> |
| distribution |
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{
"@type": "dcat:Distribution",
"title": "ArcGIS Hub Dataset",
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|
| identifier | https://www.arcgis.com/home/item.html?id=b144ccc8c2824ee080e41d0ef5a3f396&sublayer=0 |
| issued | 2023-10-17T16:09:57.000Z |
| keyword |
[
"DDOT Urban Forestry Division",
"Root Zone",
"Tree Preservation",
"UFA"
]
|
| landingPage | https://opendata.dc.gov/datasets/DCGIS::dc-estimated-trees |
| license | https://creativecommons.org/licenses/by/4.0 |
| modified | 2023-10-17T16:11:19.719Z |
| publisher |
{
"name": "City of Washington, DC"
}
|
| spatial | -77.1197,38.8032,-76.9089,38.9959 |
| theme |
[
"geospatial"
]
|
| title | DC Estimated Trees |
