Topographic Maps General

A map is a representation of the earth, or part of it. The distinctive characteristic of a topographic map is the use of contour lines to show the shape of the earth's surface. USGS topographic maps also show many other kinds of geographic features,...
You can purchase topographic maps several ways:1) Download or online from the USGS Store.Click on "Maps" in the left margin or click on the "Map Locator" near the center of the screen.  Topographic maps in GeoPDF format are available for free download by...
You can order the good old-fashioned paper versions of the state by state indexes of USGS topographic maps online from the USGS Store. The indexes are free, but there is a $5 handling charge for an order. You can also interact with these index maps in...
Once you've gathered as many facts about family history and customs as possible, turn to maps to uncover more specific information or to solve historical mysteries.Old and new maps can help you track down facts about a branch of your family. How? In the...
A USGS topographic map usually is named for the most prominent feature within the bounds of the map, which is frequently a community. Topographic maps generally are named for the most centrally located, well-known, and/or largest community identified on...
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...
After the completion of the original 7.5-minute map series in 1992 and until late 2008, the USGS mapping program focused on creating national geographic information system (GIS) databases. In November 2008, USGS management committed to design and produce...