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## Accessing USGS topographic maps has never been easier

TopoView highlights one of the USGS's most important and useful products, the topographic map. In                    1879, the USGS began to map the Nation's topography. This mapping was done at different levels of                    detail, to support various land use and other purposes. As the years passed, the USGS produced new                    map versions of each area. TopoView shows the many and varied topographic maps of each of these                    areas through history. This can be particularly useful for historical purposes, such as finding the                    names of natural and cultural features that have changed over time.

This interface was created by the National Geologic Map Database project (NGMDB), in support of topographic                    mapping program managed by the National Geospatial Program (NGP). Geologic mapping and topographic mapping                    at the USGS have a long tradition together (see 1888                        report). The NGMDB project is proud to assist the NGP in bringing these maps to the Web.

## Packed with new features and downloadable file formats

The maps shown through topoView are from the USGS’s US Topo series and earlier Historical Topographic Map Collection (HTMC). The term “US Topo” refers                    specifically to quadrangle topographic maps published in 2009 and later. These maps are modeled on                    the familiar 7.5-minute quadrangle maps of the period 1947-1992, but are mass-produced from national                    GIS databases on a repeating cycle. US Topo maps repackage geographic information system (GIS) data                    in traditional map form. This benefits non-specialist map users, as well as applications that need                    traditional maps. 

The goal of the HTMC, which started in 2011, is to provide a digital repository of USGS 1:250,000                    scale and larger (more detailed) maps printed between 1884 (the inception of the topographic mapping                    program), and 2006. Currently, there are more than 178,000 maps in the HTMC and the collection                    continues to grow. NGP is accurately cataloging and creating metadata to accompany high-resolution,                    georeferenced digital files of each of these printed maps.

 At present, both the US Topo series and HTMC maps are offered as GeoPDFs through The National Map and the USGS                        Store. However, additional formats are now offered for evaluation and use through topoView.                    These include:

**GeoTIFF** – The GeoTIFF files are a compressed, 300 dpi TIFF image format, with                    embedded georeferencing information so that the map can be used directly in a Geographic Information                    System (GIS). The GeoTIFFs are generated at true scale, allowing users to plot the map at the                    intended map scale in cases where a hard copy is needed.

**JPEG** – The high-resolution JPEGs, or 'Browse JPEG' format are useful for getting a                    quick view of the map in order to find place names or simply explore the map area without the need                    for downloading a large file.

**KMZ** – The KMZ format is a compressed form of the KML format which is used for                    displaying the maps in Google Earth.

**Metadata** – GeoTIFF downloads for both HTMC and US Topo maps come bundled with an XML                    metadata file. To view the metadata file, simply open it in a text editor, web browser, or                    application that supports XML. An inventory of topographic maps for the HTMC and US Topo collections                    is refreshed nightly and can be used to keep private collections of map files current, write                    download scripts, and for other kinds of advanced data management. Download                        an inventory of USGS HTMC and US Topo map products (CSV format).                    Send us your feedback
We're pleased to offer these formats to you, and invite you to                        explore the collection of USGS topographic maps. Help us make topoView more useful by sending us                        comments                            and suggestions on the site's usability and the addition of new downloadable formats.                    
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**View and Download** maps now

Learn more about the **NGMDB** project
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Want to see more? Check out our **video demo**

See our **FAQ's** section for answers
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