{6bf22865-cede-40d9-96d4-71ae3b15bbe5} 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 2025-07-23 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) EnviroAtlas - 2016 Riparian Tree Canopy Cover by 12-digit HUC for Puerto Rico and the US Virgin Islands 2020-10-01 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 represents the percentage of land area that is classified as tree canopy cover using the National Land Cover Database 2016 USFS Tree Canopy Cover dataset for each 12-digit hydrologic unit code (HUC) in Puerto Rico and the US Virgin Islands. Streams were derived from the National Hydrography Dataset (NHD) High Resolution dataset obtained June 2020. 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). This dataset is useful for evaluating the potential value of ecosystem services provided by vegetation communities, and the impacts of developed land cover. 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 12-digit HUCs Agriculture Ecosystem Services EnviroAtlas Environment Environmental Atlas Green Space Land Cover Surface Water Water Wetlands theme EnviroAtlas Puerto Rico United States Virgin Islands 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 -67.951455 -64.565191 17.673736 18.516091 2016-01-01 true Entity and Attribute Information Entity and Attribute Overview: The metric was generated using the Zonal Statistics as Table tool in ArcGIS 10.7 for Desktop. Buffer zones within 45 meters of streams, rivers, and other hydrologically connected waterbodies were generated using the Riparian Land Cover Proportions tool in the Riparian Characteristics toolset of the ATtILA for ArcGIS toolbox (ATtILA 10_0.tbx, 5/26/2016 version) in ArcGIS from select water features in the NHD High Resolution dataset obtained June 2020. The ATtILA tool was used because it restricts buffer zones from crossing HUC boundaries. CNPY2016PRUSVI_NoWater, derived from the NLCD 2016 USFS Tree Canopy Cover (https://www.mrlc.gov/data), was used as the Input value raster. A comprehensive list of metric creation steps is included in the Processing Steps. 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/PRVI_metrics_Mar2024_FGDB.gdb.zip download Download The URL providing direct access to the downloadable dataset. download https://enviroatlas.epa.gov/download/PRVI_metrics_Mar2024_CSV.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://www.epa.gov/enviroatlas/enviroatlas-data 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 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 Obtained the NHDPlusV2 Watershed Boundary Dataset (WBD) Snapshot for Puerto Rico and the US Virgin Islands, EnviroAtlas version (https://www.epa.gov/enviroatlas). 2017-08-16T00:00:00 Obtained the NLCD 2016 USFS Tree Canopy Cover (PRUSVI) dataset (NLCD_2016_PRUSVI_Tree_Canopy_20191017.img) 2020-05-07T00:00:00 Performed a setnull operation on the NLCD_2016_PRUSVI_Tree_Canopy_20191018.img to eliminate the edge areas (Value greater than 100). Output raster: CNPY2016PRSUVI_ND. 2020-06-01T00:00:00 Obtained the EnviroAtlas version of the Coastal Change Analysis Program's (C-CAP) 2010 land cover raster for Puerto Rico: PR_CCAP_Land_Cover_2005_2010_EnviroAtlasVersion (https://www.epa.gov/enviroatlas). 2017-08-16T00:00:00 Obtained the EnviroAtlas version of the C-CAP land cover raster for US Virgin Islands (VI_CCAP_Land_Cover_2012_EnviroAtlasVersion_20170814.gdb). 2017-08-17T00:00:00 Created new constant raster (CONSTANT99) that had the same extent, cell size, and geographic projection as CNPY2016PRUSVI_ND. All cells had the value of "99". 2020-06-01T00:00:00 Created new raster (CCAP_REPROJ_PR) by reprojecting the C-CAP land cover raster to match the Albers projection used for the NLCD 2016 Percent Tree Canopy raster. The output extent, cell size, and cell origin were set to match the NLCD 2016 Tree Canopy raster as well. The sampling technique was set to MAJORITY. 2020-06-01T00:00:00 Created new raster (CCAP_REPROJ_VI) by reprojecting the C-CAP land cover raster to match the Albers projection used for the NLCD 2016 Percent Tree Canopy raster. The output extent, cell size, and cell origin were set to match the NLCD 2016 Tree Canopy raster as well. The sampling technique was set to MAJORITY. 2020-06-01T00:00:00 Created new raster (mosaicPR) by performing an ArcGIS MOSAIC (Data Management) operation between CONSTANT99 and CCAP_REPROJ_PR. The tool's optional Mosaic Operator was set to MINIMUM. The output raster has the same projection, extent, and cell size as the NLCD 2016 Tree Canopy raster. NoData cells have the value "99". 2020-06-01T00:00:00 Created new raster (mosaicVI) by performing an ArcGIS MOSAIC (Data Management) operation between CONSTANT99 and CCAP_REPROJ_VI. The tool's optional Mosaic Operator was set to MINIMUM. The output raster has the same projection, extent, and cell size as the NLCD 2016 Tree Canopy raster. NoData cells have the value "99". 2020-06-01T00:00:00 Created new raster (CCAP_PRUSVI_Mosaic) by performing a CON statement to create a single grid with the CCAP land cover information for both Puerto Rico and the US Virgin Islands in it and with the same extent, projection, and cell size as the NLCD 2016 Tree Canopy raster. NoData cells are coded as "99". Con ("mosaicVI", "mosaicPR", "mosaicVI", "value = 99") 2020-06-01T00:00:00 Used SET NULL to create a new raster (CNPY2016_PRUSVI_NoWater) by setting areas coded as Background (value = 0), Unclassified (value = 1), Open Water (value = 21), Palustrine Aquatic Bed (value = 22), or Estuarine Aquatic Bed (value = 23) in CCAP_PRUSVI_Mosaic to NO DATA. All other grid cells were set to the value found in the corresponding cell in the CNPY2016PRUSVI_ND grid. 2020-06-01T00:00:00 Downloaded the NHD High Resolution datasets by HU-4 Subregions from https://www.usgs.gov/core-science-systems/ngp/national-hydrography/access-national-hydrography-products. 2020-06-16T00:00:00 Processed each NHDFlowline feature class in the NHD with the StrmLine HiRes Iterative Tool in the AtlasAnalyses Toolbox (a self-created toolbox for the purpose of standardizing analyses for the EnviroAtlas). The StrmLine HiRes Iterative tool performs the following operations: 2020-09-22T00:00:00 Step 1 - Iterates through the NHD Workspace and processes each NHD High Resolution geodatabase found there. 2020-09-22T00:00:00 Step 2 - From the current geodatabase, the NHDFlowline feature class is found in the Hydrography feature dataset. 2020-09-22T00:00:00 Step 3 - Flowlines with "FTYPE" = 460 OR "FTYPE" = 334 OR "FTYPE" = 558 are then selected 2020-09-22T00:00:00 Step 4 - Those selected flowlines are then copied into a new feature class named, strmLineXXXX, where XXXX is the 4-digit HU code. Only the Permanent_Identified, Reachcode, Ftype, and Shape_Length fields are retained. 2020-09-22T00:00:00 Step 5 - Identifying the end points of the flowline then begins by converting all vertices from the selected flowlines to points. 2020-09-22T00:00:00 Step 6 - The ArcGIS Near (Analysis) tool is then employed using the vertices point layer as both the input features and the near features. 2020-09-22T00:00:00 Step 7 - The StrmLine HiRes Iterative Tool concludes by copying points with a near distance greater than 0 into a new feature class named, strmEndXXXX, where XXXX is the 4-digit HU code. Only the Near_Dist field is retained from the Near operation. 2020-09-22T00:00:00 Processed each NHDArea and NHDWaterbody feature class in the NHD with the StrmAreal HiRes Iterative Tool in the AtlasAnalyses Toolbox (a self-created toolbox for the purpose of standardizing analyses for the EnviroAtlas). The StrmAreal HiRes Iterative tool performs the following operations: 2020-09-22T00:00:00 Step 1 - Iterates through the NHD Workspace and processes each NHD High Resolution geodatabase found there. 2020-09-22T00:00:00 Step 2 - From the current geodatabase, the NHDArea feature class is found in the Hydrography feature dataset. 2020-09-22T00:00:00 Step 3 - NHDAreas with "FTYPE" = WASH are selected. 2020-09-22T00:00:00 Step 4 - Select by Location is used to reduce the selected washes to only those that are within 1 Meters of features in the corresponding strmLineXXXX, where XXXX is the current 4-digit HU code. 2020-09-22T00:00:00 Step 5 - NHDArea features with FTYPE = StreamRiver or Rapids or Lock Chamber are added to the selected Washes. 2020-09-22T00:00:00 Step 6 - From the corresponding NHDWaterbody feature class, NHDWaterbodies with "FTYPE" = Reservoir or LakePond or Ice Mass are selected. 2020-09-22T00:00:00 Step 7 - Select by Location is used to reduce the selected NHDWaterbodies to only those that are within 1 Meters of features in the corresponding strmLineXXXX, where XXXX is the current 4-digit HU code. 2020-09-22T00:00:00 Step 8 - The selected NHDWaterbodies and selected NHDAreas are merged into a new feature class named, NHD_MergeXXXX, where XXXX is the current 4-digit HU code. 2020-09-22T00:00:00 Step 9 - An integer type field named, "dummy", is added to NHD_MergeXXXX, and its value is calculated as 1. 2020-09-22T00:00:00 Step 10 - NHD_MergeXXXX is then dissolved based on the "dummy" field. Multipart features are not created. Only boundaries between polygons immediately adjacent to each other are dissolved. 2020-09-22T00:00:00 Step 11 - A second dissolve is performed on NHD_MergeXXXX, again using the "dummy" field and not opting for multipart output features. The second dissolve helps to reduce splits in polygons sometimes introduced when the GIS software resorts to tiling to process large datasets. 2020-09-22T00:00:00 Step 12 - Select by Location is used to select areal water features in NHD_MergeXXXX that are within 1 Meters of features in the corresponding strmENDXXXX feature class. 2020-09-22T00:00:00 Step 13 - Select by Location is used to add to the selected features in NHD_MergeXXXX any areal water feature that intersects the line features in the corresponding strmLineXXXX feature class. 2020-09-22T00:00:00 Step 14 - The StrmAreal HiRes Iterative Tool ends by copying the selected features in NHD_MergeXXXX into a new feature class named, strmArealXXXX, where XXXX is the current 4-digit HU code. 2020-09-22T00:00:00 For each strmLine#### feature class, all features where Ftype did not equal 558 (Artificial Paths) were selected and saved as strmLine####_NAP. NAP stands for No Artificial Paths and #### is the 4-digit HUC code from the NHD. 2020-09-22T00:00:00 For Puerto Rico, buffer zones within 45 meters of streams, rivers, and other hydrologically connected waterbodies were generated using the Riparian Land Cover Proportions tool in the Riparian Characteristics toolset of the ATtILA for ArcGIS toolbox (ATtILA 10_0.tbx, 5/26/2016 version) in ArcGIS by selecting INTERMEDIATES from the Additional Options parameter. Used NHDPlusV2_WBDSnapshot_EnviroAtlas_PR as the reporting unit feature, CCAP_PRUSVI_2010_2012_MOSAIC as the land cover grid, and the respective strmLine####_NAP and strmAreal#### shapefiles for the Puerto Rico region as the stream features. A user-defined land cover scheme for the C-CAP dataset was used to identify land cover classes. Output buffer feature classes where saved in the RiparianLine_PRUSVI.gdb geodatabase. The ATtILA tool was used because it restricts buffer zones from crossing HUC boundaries. 2020-09-22T00:00:00 For US Virgin Islands, buffer zones within 45 meters of streams, rivers, and other hydrologically connected waterbodies were generated using the Riparian Land Cover Proportions tool in the Riparian Characteristics toolset of the ATtILA for ArcGIS toolbox (ATtILA 10_0.tbx, 5/26/2016 version) in ArcGIS by selecting INTERMEDIATES from the Additional Options parameter. Used NHDPlusV2_WBDSnapshot_EnviroAtlas_VI as the reporting unit feature, CCAP_PRUSVI_2010_2012_MOSAIC as the land cover grid, and the respective strmLine####_NAP and strmAreal#### shapefiles for the US Virgin Island region as the stream features. A user-defined land cover scheme for the C-CAP dataset was used to identify land cover classes. Output buffer feature classes where saved in the RiparianLine_PRUSVI.gdb geodatabase. The ATtILA tool was used because it restricts buffer zones from crossing HUC boundaries. 2020-09-22T00:00:00 Merged the generated buffer themes in RiparianLine_PRUSVI.gdb into a single polygon feature class, Buffers45_HU21. 2020-09-22T00:00:00 The Delete Identical (Data Management) tool was used on Buffers45_HU21 to eliminate any possible overlapping features between features in neighboring 4-digit HUCs. 2020-09-22T00:00:00 Added a text field named, HUC_8, to the attribute table for Buffers45_HU21, and calculated its values as !HUC_12![:8] 2020-09-22T00:00:00 Performed a Frequency analysis on the HUC_8 field in Buffers45_HU21 attribute table. The frequency table was named, HUC21_List. 2020-09-22T00:00:00 Ran the NHD HUC 2 WBD HUC tool from the AtlasAnalyses toolbox with Buffers45_HU21 as the input . This tool steps through the list of 8-digit HUC codes in the HUC21_List table and selects by attribute all of the buffer polygons in Buffers45_HU21 with matching values in the HUC_8 field. The selected buffer polygons are copied into a new feature class named, Buffer45_########, where ######## is the 8-digit HUC code. A separate feature class is created for each 8-digit HUC code record in the HUC21_List. 2020-09-22T00:00:00 Performed Repair Geometry on all generated Buffer45_######## feature classes, where ######## is the 8-digit HUC code. 2020-09-22T00:00:00 Performed a dissolve operation on each Buffer45_######## feature class using HUC_12 as the Dissolve Field. Create multipart features was selected. The output feature class was named, Buffer45_########_D. 2020-09-22T00:00:00 Performed Repair Geometry on all Buffer45_########_D feature classes, where ######## is the 8-digit HUC code. 2020-09-22T00:00:00 Merged the dissolved and repaired 12-digit HUC buffer feature classes into Buffers_HU21_WBD. 2020-09-22T00:00:00 Calculation for Percent Tree Canopy within the 45 meter riparian buffer zone for each 12-digit HUC was done using the Zonal Statistics as Table tool with Buffers45_HU21_WBD as the Input feature zone data, the HUC_12 field as the Zone field, and CNPY2016PRUSVI_NoWater as the Input value raster. The Ignore NoData checkbox was checked. The output table was named, R45CNPY2016_WBD21. 2020-09-22T00:00:00 Used Alter Field to change the MEAN field name in R45CNPY2016_WBD21 to R45CANOPY. 2020-09-22T00:00:00 Joined the R45CNPY2016_WBD21 table to the HUC12_IDS_PRUSVI table (a table with a record for each of the 12-digit HUC code in the NHDPlusV2_WBDSnapshot_EnviroAtlas_PR and the NHDPlusV2_WBDSnapshot_EnviroAtlas_VI feature classes) using the common HUC_12 field. 2020-09-22T00:00:00 Turned off all fields save HUC_12 and R45CANOPY, and exported the joined table to R45CNPY2016_PRUSVI make the join permanent. 2020-09-22T00:00:00 unknown 2029-07-23 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