Draft Lakes and Reservoirs Indicator - version:20250213 (Southeast and Midwest Blueprint) [U.S. Fish and Wildlife Service]
U.S. Fish & Wildlife Service · 2025 Full Details
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Full Details
- Title
- Draft Lakes and Reservoirs Indicator - version:20250213 (Southeast and Midwest Blueprint) [U.S. Fish and Wildlife Service]
- Description
- Upstream watershed condition is very important in determining the nutrient, sediment, and contaminant loads entering a lake. All developed and agricultural land cover categories (disturbance) were added to quantify the amount of disturbed landcover that may negatively affect water quality entering the lake. The nearshore zone is of higher value compared with the open water zone for both ecological and cultural reasons. The nearshore zone potentially supports higher productivity of benthos, macrophytes, and is used by many species for spawning. It is also the portion of the lake that is typically most accessible for public recreation. 1. Preparing the NLCD: a. Using NLCD 2021 set open water values to null - open water should not count toward nearshore landcover condition. b. Assign each landcover type into categories of "natural" and "non-natural" c. Create a 9x9 moving window to assess the majority landcover composition in the neighborhood for each pixel. 2. Assign the amount of disturbance in the contributing watershed: a. Join the attribute table "Archetypes_rawdata_2023-10-12.csv" (LaPierre et al. 2023) to the LAGOS Lakes dataset. b. Eliminate any lakes that do not have a valid watershed value (removes 3253 or 0.7 % of lakes) c. Add the upstream watershed amounts of agricultural and developed landcover "ws_nlcd2016_totalag_pct" and "ws_nlcd2016_totaldev_pct" to get "totdev_totag" d. Classify lake water quality based on the Midwest Glacial Lakes Partnership thresholds for watershed landcover composition and convert to raster: 3 = if percent developed + percent ag in the watershed is <= 25 2 = if percent developed + percent ag in the watershed is >25 and <=60 1 = if percent developed + percent ag in the watershed is > 60 3. Nearshore delineation: a. Use a "negative buffer" to delineate a 100m buffer inside each lake polygon - the nearshore zone - and convert from vector to raster. This step is used to separate open water from nearshore and assign a higher value to the latter if the adjacent shoreline condition is mostly natural. b. Combine lake boundaries with nearshore zone delineations using "Union" - this step assigns both the open water and the nearshore with values for watershed disturbance. 4. Using results from Step 3b, convert vector to raster to get: a. the whole lake class of contributing watershed condition. b. the extent of the open water and nearshore zone 5. Assign raster values of the nearshore zone by multiplying the nearshore zone value (=1) by the moving windows results from Step 1c. Nearshore areas receive a value of 1 if the majority nearshore landcover is natural, and a zero if the majority nearshore landcover is not natural. 6. Using a conditional statement, combine the results as follows: If the pixel is in nearshore zone, add the nearshore value (=1 or 0) to the whole lake contributing watershed condition score (values 1,2, or 3), otherwise the pixel is in the open water zone and receives only the whole lake contributing watershed condition score. 7. Clean up errant pixels caused by non-overlapping LAGOS and NLCD open water using the condition: If the final score is NULL but there is an open water class value, then assign that value to the pixel, otherwise, keep the existing value.
- Creator
- U.S. Fish & Wildlife Service
- Temporal Coverage
- Last Modified: 2025-02-26
- Date Issued
- 2025-02-13
- Rights
- The United States Fish and Wildlife Service (Service) shall not be held liable for improper or incorrect use of the data described and/or contained herein. While the Service makes every reasonable effort to ensure the accuracy and completeness of data provided for distribution, it may not have the necessary accuracy or completeness required for every possible intended use. The Service recommends that data users consult the associated metadata record to understand the quality and possible limitations of the data. The Service creates metadata records in accordance with the standards endorsed by the Federal Geographic Data Committee. As a result of the above considerations, the Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of the data. It is the responsibility of the data user to use the data in a manner consistent with the limitations of geospatial data in general and these data in particular. Although these data have been processed successfully on a computer system at the Service, no warranty, expressed or implied, is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This applies to the use of the data both alone and in aggregate with other data and information.
- Access Rights
- Public
- Format
- ArcGIS ImageMapLayer
- Language
- English
- Date Added
- August 10, 2025
- Provenance Statement
- The metadata for this resource was last retrieved from U.S. Fish and Wildlife Service Open Data on 2025-08-24.
Resource Class
Resource Type
Place
Local Collection
Cite and Reference
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Citation
U.S. Fish & Wildlife Service (2025). Draft Lakes and Reservoirs Indicator - version:20250213 (Southeast and Midwest Blueprint) [U.S. Fish and Wildlife Service]. . https://gis-fws.opendata.arcgis.com/content/fws::draft-lakes-and-reservoirs-indicator-version20250213-southeast-and-midwest-blueprint (web service) -
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