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Tidal Flats - National Wetlands Inventory (USFWS)
- rmc-glo.hub.arcgis.com
Updated Oct 19, 2022
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EmailClick to copy linkLink copiedCitekelsey.williams@glo.texas.gov (2022). Tidal Flats - National Wetlands Inventory (USFWS) [Dataset]. https://rmc-glo.hub.arcgis.com/datasets/ced9b65a988e4a3b9cdeae6b08f8b41dDataset updatedOct 19, 2022Dataset authored and provided bykelsey.williams@glo.texas.govArea coveredDescriptionProject Level MetadataWetland mapping is conducted in defined geographic areas called projects. Imagery is used as the base information to define the type and location of each wetland. The scale, type and date of imagery used in a project is provided in a pop-up window when a wetland polygon is selected on the Wetlands Mapper. Investigators that complete a wetland mapping project record information on the source imagery, collateral data, inventory method, data limitations, geographic features, landforms, wetland types and other specifics in a project metadata document.This project level metadata can be found by selecting a wetland polygon on the Wetlands Mapper and then clicking on the link next to ‘Project Metadata’ in the pop-up window. Note: Not all areas have a Project Metadata document. Historic Wetlands Map Information MetadataInformation about the wetland types, vegetation, regional and temporal conditions and geographic features are captured in a historic map document. This document is specific to a geographic area and can be accessed by selecting a wetland polygon on the Wetlands Mapper and then clicking on the link next to ‘Historic Map Info’ in the pop-up window. Note: Not all areas have a Historic Wetlands Map Information document.Unvegetated coastal wetlands (see the coastal wetlands definition) containing silt, clay, or sand that are subject to inundation by wind-driven water level fluctuations and may be covered by algal mats (blue - green algae i.e.cyanobacteria). Tidal sand and mud flats protect shorelines by diffusing wave energy, provide feeding grounds for coastal shorebirds, fish, and invertebrates and, when algal mats are present, serve an important role in nutrient cycling.This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.Field Definitions:For field definitions contact the US Fish and Wildlife Service
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Core areas for intact habitat
- data.amerigeoss.org
- sdgs.amerigeoss.org
esri rest, htmlUpdated May 24, 2017ShareFacebookTwitterEmailClick to copy linkLink copiedCiteAmeriGEO ArcGIS (2017). Core areas for intact habitat [Dataset]. https://data.amerigeoss.org/dataset/core-areas-for-intact-habitathtml, esri restAvailable download formatsDataset updatedMay 24, 2017Dataset provided byAmeriGEO ArcGISDescriptionThis map serves as the baseline for the green infrastructure apps that visualize areas that are relatively undisturbed by development or agriculture.
The habitat cores shown were derived using a model built by the Green Infrastructure Center Inc. and adapted by Esri.
The Intact Habitat Near Me app uses this web map as its basis.This web map provides an easily accessible data base of intact core habitat areas across the continental United States, appropriate in scale to support Green Infrastructure Planning at local, regional and national scales, using the best available national data. The results are intended to be supplemented or replaced with more current or higher resolution data when available, while still supporting Green Infrastructure planning initiatives at the regional level.Using a methodology outlined by the Green Infrastructure Center, Inc. Esri staff created a national intact habitat cores database for the lower 48 United States.The methodology identified, using nationally available datasets, intact or minimally disturbed areas at least 100 acres in size and with a minimum width of 200 meters.
The identification of intact areas relied upon the 2011 National Land Cover Database. Potential cores areas were selected from land cover categories not containing the word “developed” or those categories associated with agriculture uses (crop, hay and pasture lands). The resulting areas were tested for size and width requirements, and then converted into unique polygons.
These polygons were then overlaid with a diverse assortment of physiographic, biologic and hydrographic layers to use in computing a “core quality index”.
These layers included:
Number of endemic species (Mammals, Fish, Reptiles, Amphibians, Trees) (Jenkins, Clinton N., et. al, (April 21, 2015) US protected lands mismatch biodiversity priorities, PNAS vol.112, no. 16, www.pnas.org/cgi/doi/10.1073/pnas.1418034112)
Priority Index areas: Endemic species, small home range size and low protection status. (Jenkins, Clinton N., et. al, (April 21, 2015) US protected lands mismatch biodiversity priorities, PNAS vol.112, no. 16, www.pnas.org/cgi/doi/10.1073/pnas.1418034112)
Unique ecological systems (based upon work by Aycrig, Jocelyn L, et. al. (2013) Representation of Ecological Systems within the Protected Areas Network of the Continental United States. PLos One 8(1):e54689). New data constructed by Esri staff, using TNC Ecological Regions as summary areas.
Ecologically relevant landforms (Theobald DM, Harrison-Atlas D, Monahan WB, Albano CM (2015) Ecologically-Relevant Maps of Landforms and Physiographic Diversity for Climate Adaptation Planning. PLoS ONE 10(12): e0143619. doi:10.1371/journal.pone.0143619 ,http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0143619
Local Landforms (produced 3/2016) by Deniz Basaran and Charlie Frye, Esri, 30 m* resolution.
"Improved Hammond’s Landform Classification and Method for Global 250-m Elevation Data" by Karagulle, Deniz; Frye, Charlie; Sayre, Roger; Breyer, Sean; Aniello, Peter; Vaughan, Randy; Wright, Dawn, has been successfully submitted online and is presently being given consideration for publication in Transactions in GIS.
*we scaled the neighborhood windows from the 250-meter method described in the paper, and then applied that to 30-meter data in the U.S.
National Elevation Dataset, USGS, 30 m resolution, http://viewer.nationalmap.gov/launch/
NWI – National Wetlands Inventory “ Classification of Wetlands and Deepwater Habitats of the United States”. U.S. Department of the Interior, Fish and Wildlife Service, Washington, DC. FWS/OBS-79/31 , U.S. Fish and Wildlife Service, Division of Habitat and Resouce Conservation (prepared 10/2015)
NLCD 2011 – National LandCover Database 2011http://www.mrlc.gov/nlcd2011.php (downloaded 1/2016) Homer, C.G., et. al. 2015,Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354
NHDPlusV2 –https://www.epa.gov/waterdata/nhdplus-national-hydrography-dataset-plus
Received from Charlie Frye, ESRI 3/2016. Produced by the EPA with support from the USGS.
gSSURGO –Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture. Web Soil Survey. Available online at http://websoilsurvey.nrcs.usda.gov/. Accessed 3/2016, 30 m resolution
GAP Level 3 Ecological System Boundaries (downloaded 4/ 2016)
http://gapanalysis.usgs.gov/gaplandcover/data/download/
NOAA CCAP Coastal Change Analysis Program Regional Land Cover and Change–
downloaded by state (3/2016) from: https://coast.noaa.gov/ccapftp/#/
Description: https://coast.noaa.gov/dataregistry/search/collection/info/ccapregional
30 m resolution, 2010 edition of data
NHD USGS National Hydrography Dataset http://nhd.usgs.gov/data.html
TNC Terrestrial Ecoregionshttp://maps.tnc.org/gis_data.html#TNClands (downloaded 3/2016)
2015 LCC Network Areashttps://www.sciencebase.gov/catalog/item/55b943ade4b09a3b01b65d78
Evaluation:
The creation of a national core quality index is a very ambitious objective, given the extreme variability in ecosystem conditions across the United States. The additional attributes were intended to provide flexibility in accommodating regional or local environmental differences across the U.S.
Scripts for constructing local cores and scoring them using the Green Infrastructure Center’s methodology are available on esri.com/greeninfrastructure
Two general approaches were used in the developing core quality index values. The first (default) follows the guidance of the Green Infrastructure Center’s scoring approach developed for the southeastern US where size of the core is the primary determinant of quality. The second; Bio-Weights puts more emphasis on bio-diversity and uniqueness ecosystem type and de-emphasizes slightly the importance of core size. This is to compensate for the very large intact core habitat areas in the west and southwest which also have comparatively low biodiversity values.
Scoring values:
Default Weights
0.4, # Acres0.1, # THICKNESS0.05, # TOPOGRAPHIC DIVERSITY (Standard Deviation)0.1, # Biodiversity Priority Index (SPECIES RICHNESS in GIC original version)0.05, # PERCENTAGE WETLAND COVER0.03, # Ecological Land Unit – Shannon-Weaver Index (SOIL VARIETY in GIC original version)0.02, # COMPACTNESS RATIO (AREA RELATIVE TO THE AREA OF A CIRCLE WITH THE SAME PERIMETER LENGTH)0.1, # STREAM DENSITY (LINEAR FEET/ACRE)0.05, # Ecological System Redundancy (RARE/THREATENED/ENDANGERED SPECIES ABUNDANCE (Number of occurrences) in GIC original version) 0.1, # Endemic Species Max (RARE/THREATENED/ENDANGERED SPECIES DIVERSITY (Number of unique species in a core) in GIC original version)
Bio-Weights
0.2, # Acres0.1, # THICKNESS0.05, # TOPOGRAPHIC DIVERSITY (Standard Deviation)0.25, # Biodiversity Priority Index (SPECIES RICHNESS in GIC original version)0.05, # PERCENTAGE WETLAND COVER0.03, # Ecological Land Unit – Shannon-Weaver Index (SOIL VARIETY in GIC original version)0.02, # COMPACTNESS RATIO (AREA RELATIVE TO THE AREA OF A CIRCLE WITH THE SAME
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FacebookTwitterEmailProject Level MetadataWetland mapping is conducted in defined geographic areas called projects. Imagery is used as the base information to define the type and location of each wetland. The scale, type and date of imagery used in a project is provided in a pop-up window when a wetland polygon is selected on the Wetlands Mapper. Investigators that complete a wetland mapping project record information on the source imagery, collateral data, inventory method, data limitations, geographic features, landforms, wetland types and other specifics in a project metadata document.This project level metadata can be found by selecting a wetland polygon on the Wetlands Mapper and then clicking on the link next to ‘Project Metadata’ in the pop-up window. Note: Not all areas have a Project Metadata document. Historic Wetlands Map Information MetadataInformation about the wetland types, vegetation, regional and temporal conditions and geographic features are captured in a historic map document. This document is specific to a geographic area and can be accessed by selecting a wetland polygon on the Wetlands Mapper and then clicking on the link next to ‘Historic Map Info’ in the pop-up window. Note: Not all areas have a Historic Wetlands Map Information document.Unvegetated coastal wetlands (see the coastal wetlands definition) containing silt, clay, or sand that are subject to inundation by wind-driven water level fluctuations and may be covered by algal mats (blue - green algae i.e.cyanobacteria). Tidal sand and mud flats protect shorelines by diffusing wave energy, provide feeding grounds for coastal shorebirds, fish, and invertebrates and, when algal mats are present, serve an important role in nutrient cycling.This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.Field Definitions:For field definitions contact the US Fish and Wildlife Service