Which of the following is NOT a method for measuring latitude and longitude?

The Geocentric Coordinate System (GCS) is primarily a three-dimensional Cartesian system used to represent locations in space using X, Y, and Z coordinates based on the Earth's center. While GCS can be used for global positioning and navigation, it does not inherently measure geographic coordinates like latitude and longitude.

In contrast, methods like Degree Minute Seconds (DMS), Decimal Degree Minutes (DDM), and Decimal Degrees (DD) are all direct representations of latitude and longitude. DMS expresses coordinates in degrees, minutes, and seconds; DDM uses decimal fractions of minutes; and DD provides a uniform representation of latitude and longitude as single decimal numbers. These methods are standard ways to refer to geographic positions on the Earth's surface.

Thus, the GCS stands apart as it utilizes a different coordinate framework not specifically aimed at the angular location defined by latitude and longitude, making it the correct choice for the method that does not measure these geographic coordinates.