{1fb6f601-845d-4f04-b09c-083ddcbaf547} eng; USA utf8 dataset EnviroAtlas Coordinator U.S. Environmental Protection Agency, Office of Research and Development-Sustainable and Healthy Communities Research Program, EnviroAtlas Geospatial Data Owner (919) 541-3832 109 T.W. Alexander Drive Research Triangle Park NC 27709 EnviroAtlas@epa.gov https://www.epa.gov/enviroatlas pointOfContact 2025-02-13 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) EnviroAtlas - Los Angeles, CA - People and Land Cover in Floodplains by Block Group 2019-09-17 publication U.S. EPA Office of Research & Development (ORD) - National Exposure Research Laboratory (NERL) Research Triangle Park NC publisher US Environmental Protection Agency (US EPA) originator This EnviroAtlas dataset describes the total counts and percentage of population, land area, and impervious surface in the 1% Annual Chance Flood Hazard area or 0.2% Annual Chance Flood Hazard area of each block group. The flood hazard area is defined by the National Flood Hazard Layer (NFHL) produced by the Federal Emergency Management Agency (FEMA, www.fema.gov). This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets). The purpose of this dataset is to describe the population, land area, and impervious surfaces in the high-risk flood hazard area (i.e., 1% Annual Chance Flood Hazard or 0.2% Annual Chance Flood Hazard) within the EnviroAtlas Community. The overall goal of EnviroAtlas is to employ and develop the best available science to map indicators of ecosystem services production, demand, and drivers for the nation. completed EnviroAtlas Coordinator U.S. Environmental Protection Agency, Office of Research and Development-Sustainable and Healthy Communities Research Program, EnviroAtlas Geospatial Data Owner (919) 541-3832 109 T.W. Alexander Drive Research Triangle Park NC 27709 EnviroAtlas@epa.gov https://www.epa.gov/enviroatlas pointOfContact asNeeded Ecosystem Environment theme EPA GIS Keyword Thesaurus Census Block Groups Communities Demand for Ecosystem Services Demographics Ecosystem Ecosystem Services EnviroAtlas Environment Environmental Atlas Hazards Health Human Human Well-being Land Cover Risk Water Flood Floodplain theme EnviroAtlas California Los Angeles, CA place None https://edg.epa.gov/EPA_Data_License.html otherRestrictions Use Constraints: None. Please check sources, scale, accuracy, currency and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated. otherRestrictions Access Constraints: None PUBLIC https://project-open-data.github.io/schema/#accessLevel Standard Technical Controls eng; USA environment -118.9272 -117.65058 33.24023 34.83098 2017-01-30 true Entity and Attribute Information Entity and Attribute Overview: These layers describe the FEMA flood zones of 1% Annual Chance Flood Hazard and 0.2% Annual Chance Flood Hazard within each block group. Processing steps completed using python scripts. A comprehensive list of metric creation steps is included in the Processing Steps. Slivers may exist in the National Flood Hazard Layer. The slivers were not filled in when the EnviroAtlas floodplains metrics were calculated. For more information about slivers, please contact Federal Emergency Management Agency. When calculating the EnviroAtlas Dasymetric Population Map, people are not allocated to certain land cover types or areas with steep slopes. Because of this, the modeled dasymetric population for 105 Los Angeles block groups are missing a total of 610.0 people as compared to the Census data due to steep slopes and 7.0 people as compared to the Census data due to the model's showing no livable area. All percentages were calculated using the total dasymetric population per block group, rather than the census population for accuracy's sake. Entity and Attribute Detail Citation: https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets EnviroAtlas Coordinator U.S. Environmental Protection Agency, Office of Research and Development-Sustainable and Healthy Communities Research Program, EnviroAtlas Geospatial Data Owner (919) 541-3832 109 T.W. Alexander Drive Research Triangle Park NC 27709 EnviroAtlas@epa.gov https://www.epa.gov/enviroatlas distributor https://enviroatlas.epa.gov/download//LACA_metrics_May2021_CSV_Shapes.zip download Download The URL providing direct access to the downloadable dataset. download https://enviroatlas.epa.gov/download//LACA_metrics_May2021_FGDB.zip ESRI:ArcGIS API The endpoint of a web service to access the dataset (REST endpoint, WMS GetCapabilities URL, or a SOAP WSDL endpoint). webMapService https://enviroatlas.epa.gov/arcgis/rest/services/Communities/Community_BGmetrics/MapServer information Documentation URL for accessing related documents such as data dictionary, technical information about a dataset, developer documentation, etc. information https://www.epa.gov/enviroatlas/enviroatlas-data information Home Page Alternative landing page used to redirect user to a contextual, Agency-hosted "homepage" for the Dataset or API information dataset Horizontal Positional Accuracy Report Data were collected using methods that have unknown accuracy (EPA National Geospatial Data Policy [NGDP] Accuracy Tier 10). For more information, please see EPA's NGDP at https://epa.gov/geospatial/policies.html Features represented have not been tested for completeness Features represented have not been tested for completeness Tests for integrity have not been performed. This lineage was generated by the FGDC CSDGM to 19139 transformation Begin with EnviroAtlas 1-meter Land Cover for the EnviroAtlas community and FEMA's 2017 National Flood Hazard Layer (S_Fld_Haz_Ar). 2019-08-15T00:00:00 Clip NFHL layer to the 1-km buffer of the EnviroAtlas Community Boundary. 2019-08-15T00:00:00 Project clipped NHFL into UTM. 2019-08-15T00:00:00 Add field FLDSUBTY equal to concatenated FLD_ZONE & ZONE_SUBTY. 2019-08-15T00:00:00 Add Field FEMACat and calculate based on dictionary to identify flood zones. 2019-08-15T00:00:00 Union block groups with flood layer boundaries. 2019-08-15T00:00:00 Add field FEMABG and calculate as concatenated Block Group ID and FEMA Category for further calculation. 2019-08-15T00:00:00 FEMA has full coverage for the EnviroAtlas Community Area. 2019-08-15T00:00:00 Calculate Zonal Statistics as a Table for the EnviroAtlas Dasymetrics (2011/October 2015) with the zones being the 2010 block groups within the EnviroAtlas community boundary. Add resulting population sums to the community block groups as attribute Dasy_Pop 2019-08-12T00:00:00 Zonal stats as Table for FEMABG 2019-08-12T00:00:00 unknown 2029-02-13 This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2024-02-09T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. EnviroAtlas Coordinator U.S. Environmental Protection Agency, Office of Research and Development-Sustainable and Healthy Communities Research Program, EnviroAtlas Geospatial Data Owner (919) 541-3832 109 T.W. Alexander Drive Research Triangle Park NC 27709 EnviroAtlas@epa.gov https://www.epa.gov/enviroatlas pointOfContact