What is the purpose of map index?

Map Indexes are essential tools for users of U.S. topographic maps. They provide a comprehensive overview of the various map series, special maps, and related products produced and disseminated by the U.S. Geological Survey.

These indexes are designed to simplify the process of selecting and purchasing the appropriate maps for individual needs. They offer a systematic way to navigate through the vast array of mapping resources available.

One of the key features of these indexes is the identification of quadrangle areas. Quadrangles are specific geographical regions covered by individual maps, and the index lists them by their map names and scales.

This information is crucial for users who need to locate a specific area on a map or determine the most suitable scale for their purposes. The scales indicate the level of detail presented on each map, ranging from small-scale overviews to large-scale, highly detailed representations.

In addition to the quadrangle information, the indexes also provide details on other map-related products such as digital mapping data, aerial photographs, and geophysical surveys. These resources can be invaluable for researchers, students, and professionals in a wide range of fields.