Look for complete geospatial metadata in this layer's associated xml document available from the download link

* Metric Name: American Indian Lands (Census Data)  

* Tier: 2  

* Data Vintage: 05/2022  

* Unit Of Measure: Categorical

Definition of field name COMPTYPE ([Component type):
](mailto:TribalAffairs@calepa.ca.gov)

  * ["R" is Federally recognized American Indian Reservations (AIRs)](mailto:TribalAffairs@calepa.ca.gov)
  * ["T" is Off-Reservation Trust Lands (ORTL)](mailto:TribalAffairs@calepa.ca.gov)

  

* Metric Definition and Relevance: Lands under the control of federally recognized Tribes. These boundaries have been clipped to the boundary of California so that only the portions of each Tribal area that fall within California are included. For purposes of this designation, a Tribe may establish that a particular area of land is under its control even if not represented as such on CalEPA’s DAC map and therefore should be considered a DAC by requesting a consultation with the CalEPA Deputy Secretary for Environmental Justice, Tribal Affairs and Border Relations at TribalAffairs@calepa.ca.gov

The AIANNH feature class from the Census Bureau depicts actual parcels of land
which fall into one of the following classifications:

  * Federally designated Tribal reservation
  * Off-reservation trust land (ORTL) (U.S. Trust – owned by the US Government, managed by the BIA on behalf of the designated Tribe)

  

* Creation Method: CalEnviroScreen, Version 4.0, is a science-based method for identifying impacted communities by taking into consideration pollution exposure and its effects, as well as health and socioeconomic status, at the census-tract level. CalEnviroScreen 4.0 uses the census tract as the unit of analysis. Census tract boundaries are available from the Census Bureau. CalEnviroScreen uses the Bureau’s 2010 boundaries. New boundaries will be drawn by the Census Bureau as part of the 2020 Census but will not be available until 2022. OEHHA will address updates to census tract geography in CalEnviroScreen at that time. There are approximately 8,000 census tracts in California, representing a relatively fine scale of analysis. Census tracts are made up of multiple census blocks, which are the smallest geographic unit for which population data are available. Some census blocks have no people residing in them (unpopulated blocks). The CalEnviroScreen model is based on the CalEPA working definition in that: 

● The model is place-based and provides information for the entire State of
California on a geographic basis. The geographic scale selected is intended to
be useful for a wide range of decisions.

● The model is made up of multiple components cited in the above definition as
contributors to cumulative impacts.

● The model includes two components representing Pollution Burden – Exposures
and Environmental Effects

● The model includes two components representing Population Characteristics –
Sensitive Populations (e.g., in terms of health status and age) and
Socioeconomic Factors.

The American Community Survey (ACS) is an ongoing survey of the US population
conducted by the US Census Bureau and has replaced the long form of the
decennial census. Unlike the decennial census, which attempts to survey the
entire population and collects a limited amount of information, the ACS
releases results annually based on a sub-sample of the population and includes
more detailed information on socioeconomic factors. Multiple years of data are
pooled together to provide more reliable estimates for geographic areas with
small population sizes. Each year, the HUD receives custom tabulations of ACS
data from the US Census Bureau. These data, known as the "CHAS" data
(Comprehensive Housing Affordability Strategy), demonstrate the extent of
housing problems and housing needs, particularly for low-income households.
The most recent results available at the census tract scale are the 5-year
estimates for 2013-2017. The data are available from the HUD user website (see
page 174 in the document link below:

https://oehha.ca.gov/media/downloads/calenviroscreen/report/calenviroscreen40reportf2021.pdf

  

* Credits: California Environmental Protection Agency, CalEnviroScreen 4.0 \--Office of Environmental Health Hazard Assessment, CAL EPA