One of the most important pieces of information when using GIS for site and sample location maps are the New Jersey State Plane (NJSP) Northing (Y) and Easting(X) coordinates. NJSP is a projected coordinate system used to represent geographic data (measured in feet) starting from a point in Delaware Bay on a flat plane while minimizing distortion. In reality, lines of longitude get closer together as you move north; using a local projection like NJSP preserves distances between points on the X-axis.
To evaluate a list of several locations, it usually makes sense to use GIS to export these values to a table. However, in instances where there is only one or a just a few locations, there are some quicker options.
If the location is easily viewable on aerial imagery, the New Jersey Geo-Web application has a great tool that is easy to overlook. Down in the left corner of the viewer is a crosshairs icon. When activated, NJ State Plane coordinates appear next to this icon when you click a location on the map.
These values are individually selectable by double clicking the text. The first value is the X coordinate (Easting) and the second value is the Y coordinate (Northing). Keep in mind that these numbers represent feet, and values beyond the decimal point are likely inaccurate to that level of precision. Geo-Web also facilitates uploading (zipped) ESRI shapefiles, Google .kml files, and several other formats if you have multiple locations.
If you have Latitude and Longitude coordinates from a GPS or a geotagged image, another option is to use the National Geodetic Survey’s (NGS) NGS Coordinate Conversion and Transformation Tool. This tool allows you to enter Lat, Lon coordinates and convert those values to State Plane coordinates. Input Reference frame should be set to “NAD83(2011)” and SPC Zone to “NJ-2900”. This method could also be used to convert coordinates selected from Google Maps/Google Earth.
For more information, here are some helpful links to the tools presented above:
New Jersey Department of Environmental Protection Bureau of GIS Geo-Web application
Geo-Web Quick Start Guide
NGS Coordinate Conversion and Transformation Tool
If you have any questions about GIS needs for your projects, please reach out to JMS at (908) 218-0066 or firstname.lastname@example.org to learn how we can help.