{4c231e78-4e21-4dd6-ac20-8742787dff5d} eng; USA utf8 dataset EnviroAtlas Coordinator U.S. Environmental Protection Agency, Office of Research and Development - Center for Public Health and Environmental Assessment CPHEA, 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 - San Diego, CA - People and Land Cover in Floodplains by Block Group 2022-11-17 publication U.S. EPA Office of Research and Development (ORD) - Center for Public Health and Environmental Assessment (CPHEA) 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 - Center for Public Health and Environmental Assessment (CPHEA), 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 San Diego, CA California 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 -117.596554 -116.669752 32.534156 33.503344 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. Small or irregular blocks may have had their population merged with neighboring blocks, which can introduce a discrepancy with census counts. 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 - Center for Public Health and Environmental Assessment CPHEA, 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/SDCA_metrics_Mar2023_CSV_Shapes.zip download Download The URL providing direct access to the downloadable dataset. download https://enviroatlas.epa.gov/download/SDCA_metrics_Mar2023_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 National Flood Hazard Layer dataset (NFHL). 2022-11-17T00:00:00 Clip NFHL layer by community boundary. 2022-11-17T00:00:00 Concatenate FLD_ZONE and ZONE_SUBTY fields to identify 1% Annual Chance Flood Hazard area and 0.2% Annual Chance Flood Hazard area. 2022-11-17T00:00:00 Clean up unnecessary fields for final flood hazard layer for calculation 2022-11-17T00:00:00 Check for FEMA coverage of community boundary... SDCA doesn't have full coverage or has slivers 2022-11-17T00:00:00 Project no FEMA coverage 2022-11-17T00:00:00 FEMA has slivers but full coverage 2022-11-17T00:00:00 Zonal stats as Table for FEMABG and community total population. 2022-11-17T00:00:00 Add fields for zonal FLD Dasy table. 2022-11-17T00:00:00 Calculate fields for bgrp & FEMACat in zonal FLD Dasy table. 2022-11-17T00:00:00 Calculate fields for total Dasy table. 2022-11-17T00:00:00 Calculate bgrp & FEMACat for total Dasy table. 2022-11-17T00:00:00 Select 1% and 0.2% Flood Hazard Areas and create a final dasy table from community zonal dasy pop. 2022-11-17T00:00:00 Add temp dasy fields for total Dasy table-SDCA 2022-11-17T00:00:00 Calculate count and percent populations in floodplains. 2022-11-17T00:00:00 Project FLD layer to match land cover and convert to raster. 2022-11-17T00:00:00 Tabulate area for land cover within unique BG/FEMACat zones. 2022-11-17T00:00:00 Add id fields for bgrp & FEMACat in tabulate FLD LC table-SDCA 2022-11-17T00:00:00 Calculate area(m) for land area, green space, and forest area. 2022-11-17T00:00:00 Create summary statistics table based on BG. Add and calculate fields for summed land/impervious area in 1% and 0.2% Flood Hazard Zones. 2022-11-17T00:00:00 Add final fields for impervious & total land area. 2022-11-17T00:00:00 Add final fields for dasy pop. 2022-11-17T00:00:00 Calculate Land Counts and Percent for 1% Flood Hazard zones. 2022-11-17T00:00:00 Calculate Land Counts and Percent for 0.2% Flood Hazard zones. 2022-11-17T00:00:00 Calculate fields for dasy pop in land cover table. 2022-11-17T00:00:00 Assign fields with null value for 1% and 0.2% Land Area as 0. 2022-11-17T00:00:00 Assign fields with null value for 1% and 0.2% Impervious as -99999. 2022-11-17T00:00:00 Assign fields with null value for 1% and 0.2% Dasy Pop as -99999 when Total Dasy Pop = 0. 2022-11-17T00:00:00 Assign fields with null value for 1% and 0.2% PCT Dasy Pop as -99999 when FP1_Land_M or FP02_Land_M = 0, respectively. 2022-11-17T00:00:00 Assign fields with null value for 1% or 0.2% Dasy Pop as 0 when FP1_Pop_C or FP02_Pop_C IS NULL, respectively. 2022-11-17T00:00:00 Delete unnecessary fields and export final People and Land Cover in Floodplains table to final gdb. 2022-11-17T00:00:00 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 - Center for Public Health and Environmental Assessment CPHEA, 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