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Maps, Charts, and Photos - Frequently Asked Questions
Reading Topographic Maps
A list of online map viewers is provided on the Links to Related Topics page.
The Maine Geological Survey sells U.S. Geological Survey topographic maps for Maine at scales of 1:24,000 (707 maps cover the state), 1:100,000 (35 maps cover the state), 1:250,000 (13 maps cover the state), and 1:500,000 (1 map covers the state). To order maps, go to our Maps, Publications, and Online Data site. Other retailers in Maine can be located using the USGS Map Dealer website. Order maps for other states from the USGS store.
You can find out which quads cover your area of interest by using our publications search page:
Use the USGS Geographic Names Information System to search for geographic locations by name. This site also provides direct links to online map viewers, centered on the geographic feature requested.
Reading Topographic Maps
Refer to the U.S. Geological Survey site: Topographic Map Symbols.
Refer to the U.S. Geological Survey site: Map Scales.
Q8. How do I correct a magnetic compass heading to make it refer to true north? If magnetic north moves a different amount each year, how do I find the correction value in the future? Back
You add or subtract the declination from the 360 degrees of the compass. Consult the following sites for more information:
The Maine Geological Survey has two sets of U.S. Department of Agriculture aerial photographs covering Maine, a set at a scale of 1:20,000 from the 1960's and a set at a scale of 1:40,000 from the late 1970's. These photos are available for use at the Maine Geological Survey during office hours.
A list of sources of aerial photograph for Maine is contained in Aerial photographs of Maine - Views from the sky.
The U.S. Geological Survey, in cooperation with the Association of American State Geologists, maintains the National Geologic Map Database. This site contains a geoscience map catalog, an image library, a geologic names lexicon, and a listing of new mapping.
You can determine your latitude and longitude coordinates online using the Maptech MapServer. Simply enter the name of your town and the state on the entry screen and move to the map of your town. Locate your house, and then move the cross-hairs to that position, the latitude and longitude will appear in the boxes to the left of the map.
National Geodetic Survey - Frequently Asked Questions - provides information on datums, gps, and coordinate systems.
A variety of digital data layers are available for download. Statewide digital layers of sand and gravel aquifers, surficial materals, coastal bluff hazards, generalized bedrock geology, and generalized surficial geology are available through the Maine Office of GIS. Digital layers of detailed surficial geology quadrangles are available through the Maine Geological Survey website. Datasets may be downloaded free of charge over the internet.
Last updated on April 9, 2012
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