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    • EnviroAtlas - Landcover Summaries by Block Group for American Samoa

    Metadata Updated: August 2, 2025

    This EnviroAtlas dataset represents the percentage of land area within each census block group in American Samoa that is classified as Canopy, Impervious Surface, and Vegetation using the 2022 NOAA Coastal Change Analysis Program (C-CAP) dataset. It also includes calculations of these landcover classes per capita (square meters per person) by block group based on 2020 United States Census data. Finally, ratios of canopy to impervious surface and vegetation to impervious surface were calculated by block group. Vegetation includes canopy and scrub/shrub landcover classes but does not include other types of green space. 

        Datasets for other geographies were produced separately; metadata for these related datasets may be found here: 
    Guam  https://enviroatlas.epa.gov/enviroatlas/MetadataFGDC/CanopyVegetationImpervious_GU_bg.xml,
    Northern Mariana Islands https://enviroatlas.epa.gov/enviroatlas/MetadataFGDC/CanopyVegetationImpervious_CNMI_bg.xml.

    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).

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date August 1, 2025
    Metadata Created Date March 27, 2025
    Metadata Updated Date August 2, 2025
    Reference Date(s) October 18, 2024 (creation), December 12, 2024 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from Environmental Dataset Gateway ISO Geospatial Metadata

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date August 1, 2025
    Metadata Created Date March 27, 2025
    Metadata Updated Date August 2, 2025
    Reference Date(s) October 18, 2024 (creation), December 12, 2024 (publication)
    Responsible Party U.S. Environmental Protection Agency, Office of Research and Development - Center for Public Health and Environmental Assessment (CPHEA), EnviroAtlas (Publisher)
    Contact Email
    Guid 27A92FDF-9787-4C96-94A5-7985DDA608E0
    Access Constraints https://edg.epa.gov/EPA_Data_License.html
    Bbox East Long -168.1433
    Bbox North Lat -11.046934
    Bbox South Lat -14.548699
    Bbox West Long -171.089874
    Coupled Resource
    Frequency Of Update asNeeded
    Harvest Object Id 5dbd4329-e7a8-47e7-9d28-35497390e54f
    Harvest Source Id 9b3cd81e-5515-4bb7-ad3c-5ae44de9b4bd
    Harvest Source Title Environmental Dataset Gateway ISO Geospatial Metadata
    Licence 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.
    Lineage September - October 2024 Input Data 1. Feature Classes: 2020 Census block group shapefiles for American Samoa. 2. Land Cover Rasters: 2022 NOAA C-CAP rasters for water, impervious surface, and canopy for each territory. (https://coastalimagery.blob.core.windows.net/ccap-landcover/CCAP_bulk_download/High_Resolution_Land_Cover/Phase_1_Initial_Layers/index.html) 3. Population Data: 2020 decennial census tables of population by block group for each territory (https://www.census.gov/geographies/mapping-files/time-series/geo/cartographic-boundary.2020.html#list-tab-1883739534). Processing Steps 1. Coordinate Transformation o Block group feature classes were transformed from NAD 1983 to WGS 1984 UTM Zone 2S. o Rasters were already in WGS 1984 UTM Zone 2S. 2. Land Cover Tabulation o Areas for each land cover raster were calculated per block group using Tabulate Area with the AFFGEOID column as the zone field. o Tabulated results were joined to the block group feature class via the AFFGEOID column. 3. Calculations Five derived fields were added to the block group attribute table and calculated as follows: o PercentLandCanopy = (Area of canopy (value 1)/Area of land (water value 0))×100 o PercentLandImpervious = (Area of impervious surface (value 1)/Area of land (water value 0))×100 o PercentLandVegetation = (Area of canopy (values 1 + 2)/Area of land (water value 0))×100 o CanopyImpRatio = Area of canopy (value 1)/Area of impervious surface (value 1) o VegetationImpRatio = Area of canopy raster (values 1 + 2)/Area of impervious surface (value 1) Note: In the canopy raster, values 1 and 2 represent "canopy" and "scrub/shrub" respectively. In the impervious raster, value 1 represents impervious surface. In the water raster, value 0 represents land area and value 1 represents water area. 4. Population Data Integration o The 2020 census population table was joined to the block group table via the AFFGEOID column. 5. Per Capita Metrics Three additional fields were added and calculated as follows: o CanopyPerCapita = Area of canopy (value 1)/Population o ImperviousPerCapita = Area of impervious surface (value 1)/Population o VegetationPerCapita = Area of canopy (values 1 + 2)/Population The final tables for each of the three territories were merged.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-171.089874, -14.548699], [-168.1433, -14.548699], [-168.1433, -11.046934], [-171.089874, -11.046934], [-171.089874, -14.548699]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System 32655
    Spatial Harvester True
    Temporal Extent Begin 2020-01-01T00:00:00
    Temporal Extent End 2022-12-31T00:00:00

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