Latitude and Longitude

If coordinates are to be passed on to another person it is technically necessary to report the horizontal datum and the latitude/longitude of the point (e.g. NAD 27 CONUS, 44 degrees, 7 minutes, 30 seconds north/ 104 degrees, 15 minutes, 10 seconds west...
The State Plane Coordinate System (SPCS) is a plane coordinate system (N-S and E-W lines are perpendicular) in which each individual state has from one to six zones, depending on the state's size and shape. The grid system in some states is based on the...
The distances vary. A degree, minute or second of latitude remains fairly constant from the equator to the poles; however a degree, minute, or second of longitude can vary greatly as one approaches the poles (because of the convergence of the meridians...
One system is no more or less accurate than the other. They are just two different ways of positioning a point. Many experienced users prefer UTM over latitude/longitude when using 7.5' topographic quadrangle maps. Ocean going sailors and other marine...
Most survey marks were set by the US Coast & Geodetic Survey (now called the National Geodetic Survey) and information for those marks is available on the web. For further assistance call 301-713-3242 or e-mail infocenter@ngs.noaa.gov. If the...
You will need a place name, the latitude and longitude, or any other information that will help to distinguish your area of interest.Learn more:Maps, Imagery, and PublicationsProducts & Data Available
At the bottom of every USGS topographic map is a diagram that displays the difference and direction between True North (represented as a "star" symbol) and Grid North (abbreviated as "GN").True North refers to geodetic or geographic north pole, and the...
One might confuse the difference between degrees/minutes/seconds and Decimal Degrees. To convert from decimal degrees to degrees/minutes/seconds with 45.63248 as an example:1) Subtract 45, leaving only the decimal .63248. Keep 45 for later reference.2)...