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By using this data, you agree to the SEMCOG Copyright License Agreement. The present goal of the Service is to provide the citizens of the United States and its Trust Territories with current geospatially referenced information on the status, extent, characteristics and functions of wetlands, riparian, deepwater and related aquatic habitats in priority areas to promote the understanding and conservation of these resources. LLWW descriptors (landscape position, landform, waterflow path, and waterbody type) have been incorporated into the National Wetland Inventory to create NWI+. This allows for comparison of wetlands on a functional basis. |
| summary:
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By using this data, you agree to the SEMCOG Copyright License Agreement. The present goal of the Service is to provide the citizens of the United States and its Trust Territories with current geospatially referenced information on the status, extent, characteristics and functions of wetlands, riparian, deepwater and related aquatic habitats in priority areas to promote the understanding and conservation of these resources. LLWW descriptors (landscape position, landform, waterflow path, and waterbody type) have been incorporated into the National Wetland Inventory to create NWI+. This allows for comparison of wetlands on a functional basis. |
| extent:
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[[-84.1923941717668,41.7078443724711],[-82.3355854600373,43.1866471828513]] |
| accessInformation:
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Ducks Unlimited, US Fish and Wildlife, Environment Great Lakes and Energy (EGLE) (Wetlands, Lakes, and Streams), Southeast Michigan Council of Governments (SEMCOG) |
| thumbnail:
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thumbnail/thumbnail.png |
| maxScale:
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1.7976931348623157E308 |
| typeKeywords:
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["ArcGIS","ArcGIS Server","Data","Feature Access","Feature Service","providerSDS","Service"] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the conterminous United States. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). 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. In addition to updated NWI maps (2015) the Landscape Level Wetland Functional Assessment (LLWFA) has been added to these wetland areas. The Department of Environment Great Lakes and Energy (EGLE) has been working since 2006 on refining and expanding the use of the LLWFA across much of the state. Each year, EGLE Nonpoint Source Unit is the main entity which distributes 319 watershed planning funds to local units of government, non-profit organizations, and numerous other state, federal, and local partners to reduce nonpoint source pollution statewide. Their yearly prioritization of watershed planning efforts directly influenced the completion of LLWFA efforts, and the scale at which they work is a perfect fit for this landscape level wetland information. This approach addresses both a current (2015) wetland inventory and a Pre-European Settlement inventory, to approximate change over time, and provide the best information possible on wetland status and trends from original condition through today. These watershed planning organizations have utilized these tools to help them better evaluate projects for preserving or enhancing their current wetland resources and planning for restoration of lost resources. Restoring lost wetland functionality shows great promise in addressing the systemic cause of much of the non-point source pollution occurring in the state. The 2015 NWI update is ongoing throughout the state.</SPAN></P><P><SPAN>Detailed Wetland Code Descriptions can be found using the link below. This provides a crosswalk from U.S. Fish and Wildlife Service, National Wetlands Inventory (NWI) wetlands data, as defined by the Federal Wetland Mapping Standard, to the complete wetland definitions, as defined by the Federal Wetlands Classification Standard. The table can be joined with the NWI wetlands data using the 'Attribute' field. This will provide users with a full wetland or deepwater habitat description for each polygon. </SPAN></P><P STYLE="margin:0 0 0 0;"><A href="https://maps-semcog.opendata.arcgis.com/datasets/SEMCOG::wetland-code-definitions-2015" STYLE="text-decoration:underline;"><SPAN>https://maps-semcog.opendata.arcgis.com/datasets/SEMCOG::wetland-code-definitions-2015</SPAN></A></P><P /><P><SPAN /></P></DIV></DIV></DIV> |
| licenseInfo:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>By using this data, you agree to the SEMCOG Copyright License Agreement. The full text can be read here: https://maps-semcog.opendata.arcgis.com/pages/copyright-license-agreement</SPAN></P><P><SPAN>None. Acknowledgement of the U.S. Fish and Wildlife Service and (or) the National Wetlands Inventory would be appreciated in products derived from these data. Historical wetland data produced from existing soils surveys, are obvious approximations of wetland extent and condition. NWI Coding for Pre-European Settlement wetland polygons was derived from soil characteristics, and checked against Pre-European Settlement vegetation maps produced by interpreting GLO Surveys from the early 1800s. This required an approximation of flooding and ponding frequency (water regime), as well as vegetative cover. Given that landform information in this analysis was derived from NWI water regime, certain types of landform (fringe, slope, etc) may be underrepresented in the Pre-European Settlement coverage. Pre-European Settlement hydrology was approximated using current surface water data, and checked with GLO Surveys. Streams that appeared to have a natural channel, were major courses, or were denoted as undisturbed in the attribution were included in the Pre-European Settlement analysis. The 2015 NWI data should be an accurate reflection of wetland extent and condition within the State of Michigan. However, given the inherent limitations of using a data source that is mainly derived from aerial photo interpretation, care should be exercised when using the results of this analysis. Issues with photo quality, scale, and variable environmental conditions should be taken into consideration when interpreting this information (Tiner, 2002). Also, errors of omission and commission are possible. Drier-end wetlands tend to be difficult to interpret on aerial photos, as are forested wetlands where canopy can obscure hydrology below. Because water regime information was interpreted from one snapshot in time, it may not always be reliable in determining seasonal saturation. Many times, the seasonal saturation of wetlands can vary widely over long time periods which can be difficult to account for in this type of mapping effort. This analysis produces a planning tool that can assist in identifying potential wetlands of significance for certain functions. However, no effort was made to compare the relative significance of two wetlands predicted to perform the same function. The W-PAWF also does not consider the condition of adjacent upland or the relative water quality of adjacent waterbodies, which may be considered important factors in determining the overall health and condition of a wetland (Tiner, 2005). No assessment technique on wetland function is likely to be robust enough to first evaluate the level of a particular function and then further distinguish whether the function is part of a human-based value system (Brinson, 1993). Also, it should be noted, that this type of analysis is not intended for a user to take it to the field for the purpose of matching indicators with functions. Rather, this type of analysis is intended to show how some fundamental knowledge about water flows and sources and geomorphic setting can be interpreted to illustrate ecological functioning (Brinson, 1993).</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> |
| catalogPath:
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|
| title:
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Wetlands |
| type:
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Feature Service |
| url:
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| tags:
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["boundaries","environment","inlandWaters","planningCadastre","environment","inlandWaters","Wetlands","Deepwater habitats","Hydrography","Surface water","Swamps","marshes","bogs","fens","NWI Landscape Level Wetland Assessement","LLWFA","land"] |
| culture:
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en-US |
| name:
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Wetlands |
| guid:
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BA8BD9CB-F09A-4947-83FC-15A73096C4B6 |
| minScale:
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0 |
| spatialReference:
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NAD_1983_HARN_StatePlane_Michigan_South_FIPS_2113_Feet_Intl |