UNDERSTANDING MAPS AND SCALES

MAP PROJECTIONS <p> <p> A map projection is used to portray all or part of the round Earth on a flat surface. This can not be done without some distortion. Every projection has its own set of advantages and disadvantages. There is no "best" projection. The mapmaker must select the one best suited to the needs, reducing distortion of the most important features. <p> <p> Mapmakers and mathematicians have devised almost limitless ways to project the image of the globe onto paper. Scientists at the U.S. Geological Survey have designed projections for their specific needs - such as the Space Oblique Mercator, which allows mapping from satellites with little or no distortion. <p> <p> This document gives the key properties, characteristics, and preferred uses of many historically important projections and of those frequently used by mapmakers today. <p> <p> Map Projections is a great learning tool for schools, conferences and special events. It is offered free of charge in limited quantities, but does come with a $5.00 handling charge for each order mailed. <p>

GROUND WATER: THE HIDDEN RESOURCE (BLACK & WHITE)

WATER: THE RESOURCE THAT GETS USED & USED & USED FOR EVERYTHING! (MIDDLE SCHOOL)

WATERSHEDS: WHERE WE LIVE (BLACK AND WHITE) POSTER

IMAGES OF THE USGS, 1879-1979 (56P.)

TECHNOLOGY TRANSFER OPPORTUNITIES: PARTNERSHIPS AQUATIC CONTAMINANTS IN COLLOIDAL PHASES AND HUMIC COMPLEXES

TECHNOLOGY TRANSFER OPPORTUNITIES: PARTNERSHIPS USGFS TECHNOLOGY NATIONAL WATER QUALITY LABORATORY

Technology transfer opportunities: partnership opportunities available at the USGS

Ground-water resources of the Gallatin local water quality district, southwestern Montana

Delaware

Federal Coal in the United States: A Digital Database of Coal Ownership Status

U. S. Geological Survey programs in Michigan

U.S. Geological Survey programs in Minnesota

Geologic framework and processes of Lake Pontchartrain, Louisiana