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Service Description: The Nitrogen Removal Efficiency Mapclassifies individual water features of a watershed based on how efficient they are at removing nitrogen. Efficiency (removal rate) is based primarily on applying relevant hydrographic information to each N-Sink flow path segment to calculate residence time. Streams, rivers, ponds, lakes and other impoundments are color-coded as low (0% -25%), medium(>25% -50%) or high (>50%) removal. Wetland soils are another prominent watershed feature that removes N, but no single efficiency estimate can be applied to all wetlands since the residence time of a water particle is unique for each flow path. Estimates from the literature and used by N-Sink range from <30% to >80% depending on the length of flow path, using a range of distances from 25–100 feet. Wetland soil removal efficiency thus overlaps the medium and high ranges. The Nitrogen Transport Efficiency map(aka “Heat Map”)estimates what percentage of N applied to any given location in the watershed is expected to ultimately reach the receiving waters. It is based on N-Sink’s particle tracking, applied to discrete transport reaches along the flow path and their respective N removal efficiencies. This tool can be used for a single user-defined point or points: the user clicks on a location on the map, and the tool generates a flow path from that location allowing the user to see the N sinks that the flow path encounters and to calculate the relative percentage of source N that is removed by these sinks. Currently, the tool uses an arbitrary N source value of 100 for this calculation. The heat maps are based on an interpolation of N-Sink results for data points calculated in a 100-meter grid. The Nitrogen Delivery Index is a relative measure of how much N is being delivered to the receiving waters from each location in the watershed. N loading rates taken from the literature are applied to each of the land cover classes of the National Land Cover Dataset (30m resolution), and normalized to a number between 0 and 1. This number is then multiplied by the N Transport Efficiency (above, calculated in a 30m grid), which estimates the amount of the N load that will reach the receiving waters. The result is the Nitrogen DeliveryIndex, a number between 0 and 100 that allows the user to compare the relative contributions of different locations in the watershed to N pollution.
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PROJCS["Albers_Conic_Equal_Area",GEOGCS["GCS_unknown",DATUM["D_Unknown_based_on_GRS80_ellipsoid",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["false_easting",0.0],PARAMETER["false_northing",0.0],PARAMETER["central_meridian",-96.0],PARAMETER["standard_parallel_1",29.5],PARAMETER["standard_parallel_2",45.5],PARAMETER["latitude_of_origin",23.0],UNIT["Meter",1.0]]
Single Fused Map Cache: false
Initial Extent:
XMin: 1824317.5514166588
YMin: 2277937.76839474
XMax: 2038619.5514166588
YMax: 2376267.6206949824
Spatial Reference: PROJCS["Albers_Conic_Equal_Area",GEOGCS["GCS_unknown",DATUM["D_Unknown_based_on_GRS80_ellipsoid",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["false_easting",0.0],PARAMETER["false_northing",0.0],PARAMETER["central_meridian",-96.0],PARAMETER["standard_parallel_1",29.5],PARAMETER["standard_parallel_2",45.5],PARAMETER["latitude_of_origin",23.0],UNIT["Meter",1.0]]
Full Extent:
XMin: 1834058.5514166588
YMin: 2209711.975416532
XMax: 2028878.5514166588
YMax: 2365621.975416532
Spatial Reference: PROJCS["Albers_Conic_Equal_Area",GEOGCS["GCS_unknown",DATUM["D_Unknown_based_on_GRS80_ellipsoid",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["false_easting",0.0],PARAMETER["false_northing",0.0],PARAMETER["central_meridian",-96.0],PARAMETER["standard_parallel_1",29.5],PARAMETER["standard_parallel_2",45.5],PARAMETER["latitude_of_origin",23.0],UNIT["Meter",1.0]]
Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
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Comments: The Nitrogen Removal Efficiency Mapclassifies individual water features of a watershed based on how efficient they are at removing nitrogen. Efficiency (removal rate) is based primarily on applying relevant hydrographic information to each N-Sink flow path segment to calculate residence time. Streams, rivers, ponds, lakes and other impoundments are color-coded as low (0% -25%), medium(>25% -50%) or high (>50%) removal. Wetland soils are another prominent watershed feature that removes N, but no single efficiency estimate can be applied to all wetlands since the residence time of a water particle is unique for each flow path. Estimates from the literature and used by N-Sink range from <30% to >80% depending on the length of flow path, using a range of distances from 25–100 feet. Wetland soil removal efficiency thus overlaps the medium and high ranges. The Nitrogen Transport Efficiency map(aka “Heat Map”)estimates what percentage of N applied to any given location in the watershed is expected to ultimately reach the receiving waters. It is based on N-Sink’s particle tracking, applied to discrete transport reaches along the flow path and their respective N removal efficiencies. This tool can be used for a single user-defined point or points: the user clicks on a location on the map, and the tool generates a flow path from that location allowing the user to see the N sinks that the flow path encounters and to calculate the relative percentage of source N that is removed by these sinks. Currently, the tool uses an arbitrary N source value of 100 for this calculation. The heat maps are based on an interpolation of N-Sink results for data points calculated in a 100-meter grid. The Nitrogen Delivery Index is a relative measure of how much N is being delivered to the receiving waters from each location in the watershed. N loading rates taken from the literature are applied to each of the land cover classes of the National Land Cover Dataset (30m resolution), and normalized to a number between 0 and 1. This number is then multiplied by the N Transport Efficiency (above, calculated in a 30m grid), which estimates the amount of the N load that will reach the receiving waters. The result is the Nitrogen DeliveryIndex, a number between 0 and 100 that allows the user to compare the relative contributions of different locations in the watershed to N pollution.
Subject: includes three N-Sink watershed maps
Category:
Keywords: NSink
AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 1000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, AMF, geoJSON
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
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