{dd3cc5e6-9465-4e01-968e-62d69cf612c4} 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 - Austin, TX - People and Land Cover in Floodplains by Block Group 2017-07-19 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 Texas Austin, TX 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 -98.007554 -97.488224 30.095348 30.772723 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 1 Austin block group is missing a total of 9 people as compared to Census data due to steep slope. 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/ATX_metrics_Apr2020_FGDB.zip download Download The URL providing direct access to the downloadable dataset. download https://enviroatlas.epa.gov/download/ATX_metrics_Apr2020_CSV_Shapes.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). 2017-05-22T00:00:00 Clip the NFHL to the EnviroAtlas community boundary. 2017-05-22T00:00:00 Concatenate FLD_ZONE and ZONE_SUBTY fields to identify 1% Annual Chance Flood Hazard area and 0.2% Annual Chance Flood Hazard area 2017-05-22T00:00:00 Select by Attribute the flood areas that are identified as 1% Annual Chance Flood Hazard area 2017-05-22T00:00:00 Project the flood layer for the EnviroAtlas community to the same projection as Dasymetrics (February 2016 Version) 2017-05-22T00:00:00 Calculate Zonal Statistics as Table for the EnviroAtlas Dasymetrics (February 2016 Version) with the selected area being the 2010 block groups within the EnviroAtlas community boundary. Add resulting population sums to the community block groups as FP1_Pop_C. 2017-05-22T00:00:00 Select by Attribute the flood areas that are identified as 0.2% Annual Chance Flood Hazard area 2017-05-22T00:00:00 Calculate Zonal Statistics as Table for the EnviroAtlas Dasymetrics (February 2016 Version) with the selected area being the 2010 block groups within the EnviroAtlas community boundary. Add resulting population sums to the community block groups as FP02_Pop_C. 2017-05-30T00:00:00 Calculate Zonal Statistics as Table for the EnviroAtlas Dasymetrics (February 2016 Version) with the 2010 block groups within the EnviroAtlas community boundary for total population. Add resulting population sums to the community block groups as Dasy_Pop. 2017-05-30T00:00:00 Project the flood layer for the EnviroAtlas community to the same projection as land cover dataset for the community 2017-05-30T00:00:00 Select by Attribute the flood areas that are identified as 1% Annual Chance Flood Hazard area 2017-05-30T00:00:00 Calculate Tabulate Area of each land cover type within the 1% Annual Chance Flood Hazard area using 1-m Land Cover Classification for the EnviroAtlas community in each census block group 2017-05-30T00:00:00 Add Field named FP1_Land_M for total land area in the 1% Annual Chance Flood Hazard area and FP1_Imp_M for total impervious surfaces in the 1% Annual Chance Flood Hazard area 2017-05-30T00:00:00 Calculate FP1_Land_M = Land cover classes 20+30+40+52+70+80+82+91+92 (where present) and FP1_Imp_M = 20. Some land cover classes are not present in every community. 2017-05-30T00:00:00 Select by Attribute the flood areas that are identified as 0.2% Annual Chance Flood Hazard area 2017-05-30T00:00:00 Calculate Tabulate Area of each land cover type within the 0.2% Annual Chance Flood Hazard area using 1-m Land Cover Classification for the EnviroAtlas community in each census block group 2017-05-30T00:00:00 Add Field named FP02_Land_M for total land area in the 0.2% Annual Chance Flood Hazard area and FP02_Imp_M for total impervious surfaces in the 0.2% Annual Chance Flood Hazard area 2017-05-30T00:00:00 Calculate FP02_Land_M = Land cover classes 20+30+40+52+70+80+82+91+92 (where present) and FP02_Imp_M = 20. Some land cover classes are not present in every community. 2017-05-30T00:00:00 Join LCSum table for the EnviroAtlas Community and add LandA_M for total land area in a block group to the table 2017-05-30T00:00:00 Create a new table based on the EnviroAtlas community block groups table retaining the BGRP, Dasy_Pop, FP1_Pop_C, FP02_Pop_C, FP1_Land_M, FP1_Imp_M, FP02_Land_M, and FP02_Imp_M fields 2017-05-30T00:00:00 Add Fields named FP1_Pop_P, FP1_Land_P, and FP1_Imp_P for percentage of dasymetric population, land area, and impervious surface in the 1% Annual Chance Flood Hazard area, fields named FP02_Pop_P, FP02_Land_P, and FP02_Imp_P for percentage of dasymetric population, land area, and impervious surface in the 0.2% Annual Chance Flood Hazard area 2017-05-30T00:00:00 Calculate Field FP1_Pop_P = FP1_Pop_C / Dasy_Pop and FP02_Pop_P = FP02_Pop_C / Dasy_Pop 2017-05-30T00:00:00 Calculate Field FP1_Land_P = FP1_Land_M / LandA_M and FP02_Land_P = FP02_Land_M / LandA_M 2017-05-30T00:00:00 Calculate Field FP1_Imp_P = FP1_Imp_M / FP1_Land_M and ImpA02PCT_P = ImpA02PCT_M / FP02_Land_M 2017-05-30T00:00:00 Select by Location from the features that intersect with areas without FEMA coverages 2017-05-30T00:00:00 Calculate Field where there is no FEMA coverage: FP1_Pop_C, FP1_Pop_P, FP02_Pop_C, FP02_Pop_P, FP1_Land_M, FP1_Land_P, FP02_Land_M, FP02_Land_P, FP1_Imp_M, FP1_Imp_P, FP02_Imp_M, FP02_Imp_P = -99997 2017-05-30T00:00:00 Calculate Field where no flood hazard or no people living in block group: FP1_Pop_C, FP1_Pop_P, FP02_Pop_C, FP02_Pop_P, FP1_Land_M, FP1_Land_P, FP02_Land_M, FP02_Land_P, FP1_Imp_M, FP1_Imp_P, FP02_Imp_M, FP02_Imp_P = -99999 2017-05-30T00:00:00 Export the fields to be displayed in the EnviroAtlas to a final gdb table. FP1_Pop_C, FP1_Pop_P, FP02_Pop_C, FP02_Pop_P, FP1_Land_M, FP1_Land_P, FP02_Land_M, FP02_Land_P, FP1_Imp_M, FP1_Imp_P, FP02_Imp_M, and FP02_Imp_P 2017-05-30T00:00:00 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