Forested Wetland Extent This layer is one of the South Atlantic LCC indicators in the forested wetland ecosystem. It captures the overall acres of existing forested wetlands present in the South Atlantic geography. Reason for Selection Overall acreage of existing forested wetlands provides an indicator of whether forested wetlands being inundated by sea level rise are being replaced or restored somewhere else. It is also well monitored and resonates with a diversity of audiences. Since the area occupied by forested wetland shifts over time due to land use change, this extent indicator complements the forested wetland ecosystem map. The ecosystem map attempts to include other potential sites for forested wetland, including areas [...]
Summary
Forested Wetland Extent
This layer is one of the South Atlantic LCC indicators in the forested wetland ecosystem. It captures the overall acres of existing forested wetlands present in the South Atlantic geography.
Reason for Selection
Overall acreage of existing forested wetlands provides an indicator of whether forested wetlands being inundated by sea level rise are being replaced or restored somewhere else. It is also well monitored and resonates with a diversity of audiences. Since the area occupied by forested wetland shifts over time due to land use change, this extent indicator complements the forested wetland ecosystem map. The ecosystem map attempts to include other potential sites for forested wetland, including areas altered by people (for example, for agriculture or urban development), while the extent indicator is intended to depict only the area currently occupied by intact forested wetland.
Mapping Steps
-- We resampled the 2011 NLCD from 30 m pixels to 200 m pixels using a majority resample in ArcGIS.
-- Any pixels identifeid as "woody wetlands" were considered existing forested wetland.
Indicator values were assigned as follows:
1 = Forested wetland
Defining the Spatial Extent of Ecosystems
This indicator has been clipped to the forested wetland ecosystem. Visit the Blueprint 2.1 ecosystem maps page for an explanation of how each ecosystem’s spatial extent is defined.
Known Issues
-- The extent indicators are intended to capture the current area of an ecosystem, while the ecosystem maps are intended to include the potential area of an ecosystem as well. For example, a drained forested wetland currently used for agriculture should not show up in the ecosystem extent indicator, but should be included in the ecosystem map since restoration could return it to a forested wetland state. However, due to differences in how this forested wetland extent layer and the Blueprint 2.1 forested wetland ecosystem map were created, the forested wetland ecosystem map does not include all the areas of current forested wetland depicted by this indicator. When calculating ecosystem integrity scores for the forested wetland ecosystem, we use the forested wetland ecosystem map as a mask. As a result, some pixels identified as forested wetland by this ecosystem extent layer are are classified as other ecosystems as shown in the Blueprint 2.1 ecosystem maps and scored according to the corresponding indicators. These forested wetland extent pixels that occur outside the ecosystem map do not influence the Blueprint. We hope that future improvements to our ecosystem maps will help correct this issue.
-- Some forested wetland areas that have been drained and heavily altered by humans are likely misclassified. Once they have been altered, it is challenging to identify what the naturally occurring ecosystem would be.
Indicator Overview
The South Atlantic ecosystem indicators serve as the South Atlantic LCC's metrics of success and drive the identification of priority areas for shared action in the Conservation Blueprint. To learn more about the indicators and how they are being used, please visit the indicator page. Check out the Blueprint page for more information on the development of the Blueprint, a living spatial plan to conserve our natural and cultural resources.
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License.</a> The indicator data and maps provided are only intended for use as a reference tool for landscape-level conservation planning efforts.