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Identification Information:
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Citation:
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Citation Information:
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Publication Date: 20190627
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Title: Urban tree canopy in California
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Description:
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Abstract: This web map shows the extent of urban tree canopy
in California to help communities capture community services from
trees. A tree’s canopy cover, the tree’s leaves, branches, and stems
that provide the tree coverage of the ground when viewed from above, is a
driving force behind numerous environmental, social, and economic
services. Communities plant trees in an effort to reduce summer peak
temperatures, improve air quality, reduce stormwater run-off, enhance
property values, provide wildlife habitat and strengthen social
connections in neighborhoods. If a community can understand the extent
and location of its existing tree canopy, then it can design and
implement sound management practices to maximize those services by
prioritizing locations for tree planting efforts, establishing urban
forestry master plans and sustainability plans, and managing threats to
canopy loss. The map viewer also highlights population and environmental
characteristics that can help identify communities disproportionately
burdened by risks that urban tree cover may help ameliorate. California’s
urban tree canopy covers 15% of the urban areas and contains an
estimated 173 million trees. The annual value of ecosystem services
from these trees has been estimated at $8.3. billion and the urban
forest asset has been valued at $181 billion (McPherson, E., et al
2017).The tree canopy layer was created by
EarthDefine, LLC, under contract with the USDA Forest Service and the
California Department of Forestry and Fire Protection (CALFIRE). The
layers representing population and environmental characteristics were
derived from CalEnviroScreen 3.0 (Office of Environmental Health Hazard
Assessment) and calculations of the Urban Heat Island Index were generated by the
California Environmental Protection Agency.This interactive map contains the following layers•
2012 Urban Tree Canopy- generated by EarthDefine, LLC from 2012
National Agriculture Imagery Program aerial imagery which included four
spectral bands (blue, green, red, and near-infrared). The images were
collected during leaf-on season (April 23-July 2012). The layer was
created at 1-m spatial resolution and resampled to 5-m resolution for use here. • Population Size 2010- Acquired from Esri, based on the U.S. Census Bureau’s 2010 census.•
Poverty Incidence- CalEnviroScreen 3.0 indicator of the percent of the
population living below two times the federal poverty level (5-year
estimate, 2011-2015).• Asthma incidence-
CalEnviroScreen 3.0 indicator of the number of asthma emergency
department visits per 10,000 people for the years 2011-2013.•
Cardiovascular Disease Incidence- CalEnviroScreen 3.0 indicator of the
number of heart attack emergency department visits per 10,000 people for
the years 2011-2013.• Ozone Pollution-
CalEnviroScreen 3.0 indicator of the daily maximum 8-hour ozone
concentrations extracted from the air monitors for 2012-2013.•
PM 2.5 Pollution- CalEnviroScreen 3.0 indicator of the quarterly means
extracted from the air monitors for 2012-2014 and a mean was calculated
by averaging across the three years.• Water
Body Impairment- CalEnviroScreen 3.0 indicator combines the number of
pollutants in all water bodies designated as impaired in each census
tract.• Urban Heat Island Index- CalEPA’s
Index is calculated as a positive temperature differential over time
between an urban census tract and nearby upwind rural reference points
at a height of two meters above ground level, where people experience
heat. The Index is reported in degree-hours per day on a Celsius scale. For more detailed information on the layers featured in this map viewer, please visit:http://www.earthdefine.com/spatialcover_treecanopy/https://oehha.ca.gov/calenviroscreen https://calepa.ca.gov/climate/urban-heat-island-index-for-california/ Reference CitedMcPherson,
E. Gregory; Xiao, Qingfu; van Doorn, Natalie S.; de Goede, John;
Bjorkman, Jacquelyn; Hollander, Allan; Boynton, Ryan M.; Quinn, James
F.; Thorne, James H. 2017. The structure, function and value of urban
forests in California communities. Urban Forestry & Urban Greening.
28: 43-53. https://doi.org/10.1016/j.ufug.2017.09.013.
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Purpose: This webmap shows urban tree canopy in California, along with population and environmental characteristics that can help identify communities disproportionately burdened by risks that urban tree cover may help ameliorate.
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Time Period of Content:
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Time Period Information:
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Single Date/Time:
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Calendar Date: 20190627
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Currentness Reference: Current conditions are represented.
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Status:
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Progress: Complete
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Maintenance and Update Frequency: None planned
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Spatial Domain:
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Bounding Coordinates:
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West Bounding Coordinate: -132.2191
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East Bounding Coordinate: -106.3353
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North Bounding Coordinate: 43.0806
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South Bounding Coordinate: 31.142
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Keywords:
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Theme:
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Theme Keyword Thesaurus: None
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Theme Keyword: CalEnviroScreen 3.0
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Theme Keyword: Urban Heat Island Index
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Theme Keyword: USDA Forest Service
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Theme Keyword: USFS
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Theme Keyword: R5
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Theme Keyword: R05
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Theme Keyword: Region 5
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Theme Keyword: Pacific Southwest
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Theme Keyword: Pacific Southwest Region
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Theme Keyword: Urban Tree Canopy
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Theme Keyword: California
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Access Constraints: None
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Use Constraints: The USDA Forest Service makes no warranty, expressed or implied,
including the warranties of merchantability and fitness for a particular
purpose, nor assumes any legal liability or responsibility for the
accuracy, reliability, completeness or utility of these geospatial data,
or for the improper or incorrect use of these geospatial data. These
geospatial data and related maps or graphics are not legal documents and
are not intended to be used as such. The data and maps may not be used
to determine title, ownership, legal descriptions or boundaries, legal
jurisdiction, or restrictions that may be in place on either public or
private land. Natural hazards may or may not be depicted on the data and
maps, and land users should exercise due caution. The data are dynamic
and may change over time. The user is responsible to verify the
limitations of the geospatial data and to use the data accordingly.
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Data Set Credit: USDA Forest Service; California Department of Forestry and Fire Protection
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Metadata Reference Information:
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Metadata Date: 20190627
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Metadata Contact:
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Contact Information:
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Contact Organization Primary:
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Contact Organization: USDA Forest Service
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Contact Address:
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Address Type: mailing
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City: Vallejo
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State or Province: California
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Postal Code: 94590
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Contact Voice Telephone: (707) 562-9405
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Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
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Metadata Standard Version: FGDC-STD-001-1998
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Metadata Time Convention: local time