Maps

Trails and symbols are shown clearly. A comprehensive legend appears on each map. Since each map is unique, placement of the legend varies.  
The USGS has some great science fair ideas related to earthquakes. Find inspiration for projects on other science topics by browsing the USGS Education website.
Yes. Educational institutions qualify for discounts on purchases made through the online USGS Store. To receive any discounts you must first be set up in their system. Please fax your request on school letterhead (or on a purchase order) to 303-202-4693...
The USGS does not have a formal program for teacher workshops, but USGS scientists sometimes participate in teacher workshops that are organized by universities or other education groups.
The USGS Field Records Library in Denver, Colorado, has an extensive collection of materials. Many of the field records are online at http://www.cr.usgs.gov/. You may contact them at: USGS Field Records LibraryBox 25046, MS 914Denver Federal...
That depends on what kind of reprojection you want to do. In some cases, if you want to reproject from one datum to another (specifically NAD 27 to NAD 83 or NAD 83 to NAD 27), a simple xy shift will suffice. This shift will not introduce measurable...
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...
Generally, for the conterminous United States, the North American Datum (NAD) shift amounts to about 210 meters. This shift occurs because of the change in shape of the spheroid used to define the datum. The GRS 80 spheroid (used for NAD 83) is shorter...
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...
With rare exception, the USGS does not post information or materials unless they are produced in partnership with our agency. You might be able to find a USGS scientist who is interested in working with you to develop a lesson plan, in which case it...