Parent Layer: Environmental Conditions

Name: Salinity

Display Field:

Type: Raster Layer

Geometry Type: null

Description: Sampling site locations and water quality samples were downloaded (as of 2015) from the National Water Quality Monitoring Council's Water Quality Portal (WQP), located at https://www.waterqualitydata.us. Average salinity values (in ppt) were calculated for each sample location. A continuous map was then generated using the ArcGIS Inverse Distance Weighting interpolation tool. <br><br> Additional information <br><br> Sampling site point data were imported into ESRI ArcGIS using Add XY Data, using GCS_North_American_1983 (lat/Long) as the coordinate system. The points were then projected into NAD 1983 New Jersey State Plane FIPS 2900 coordinate system. Min/Max/Average salinity values (in ppt) were calculated for the field ResultMeasureValue and then summarized for each sample location using the Summary Statistics tool. <br><br> Points that had values (NOT NULL) were then used as input into the IDW tool, using the appropriate field (Min/Max/Average) as the Z value. The cell resolution was set to 250 feet. After some preliminary review of the outputs, certain outlier sample points were dropped as input into the IDW tool, and the final IDW surfaces were created. The output surfaces were then masked by land boundaries up to the head of tide. The final step was to project the surfaces into the Web Mercator projection, using a 75 meter output cell size with cubic convolution, in order to be displayed as web maps. The salinity units are ppt (parts per thousand).

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