Mapping - Positioning: Geodetic Control Data

Do you need to locate NGS control points for your next project? Use the links below to plot NGS control points in Google Earth. Then Click on the Placemark to open a link to the point datasheet in the NGS database. To utilize this service you will need to have Google Earth software installed on your computer (its free and a lot of fun, too).

With Google Earth installed on your computer, click on one of the state links below and allow the points to plot in Google Earth. [You may have to save the file to your computer first and then click on it, depending on how you are configured.] Each point is marked with a placemark (yellow push pin) and labeled with its NGS PID. Zoom in to an area of interest close enough to identify the individual points, and click on one of the placemarks. A message balloon will open, containing a link to that point's datasheet in the NGS database.

Fine print!
This information is offered without any warranty as to its accuracy or suitability for a given task. Always refer to the most current datasheets in the NGS database. The NGS database is constantly being updated – these files are not. Many NGS benchmarks only have scaled coordinates and therefore will not plot as accurately as those points with better positional data. Also, the accuracy of Google Earth data varies, and this contributes to the uncertainty of point locations as displayed in Google Earth.

The National Readjustment is complete. You can plot the locations of only the adjusted points using the links below. This may be useful to surveyors who would like to tie their work to NSRS2007 points.

To compile the files below, existing PIDs in the NGS database were matched against PIDs from the NSRS2007 adjustment list. Points from the adjustment list not having a match in the NGS database were not plotted. This includes such points as airport runway ends and possibly other features not conventionally monumented or readily accessible. Some CORS stations are included in the adjustment list. No attempt was made to weed out the CORS stations. The coordinates from the NGS database and not the new NSRS2007 values are used to plot the point locations. Again, the usual cautions apply. Examine each point's datasheet to determine its suitability for a particular task.