Historical Topographic Maps

About 180,000 USGS historical topographic maps (more than 95% of those ever published) are available to the public free of charge, and the number of maps available is still growing. This set of GeoPDF files is referred to as the Historical Topographic...
USGS does plan to publish GeoTIFF versions of the Historical Topographic Map Collection (HTMC, http://nationalmap.gov/historical/). The design of a GeoTIFF product is currently being studied. Creation of these products may start in 2015. Although USGS...
As of mid 2014, more than 95% of the known historical USGS topographic maps have been scanned and are available for downloading or ordering. An additional 4% are in the process of being scanned and are expected to be available in early 2015. The index of...
Yes, these are different maps. After the initial preparation and printing maps are either reprinted or revised before a new printing. The date used to identify a map is the larger date in the lower-right corner. If there are multiple editions with the...
Map sheets were initially published at three primary scales (1:62,500 scale; 1:125,000 scale; and 1:250,000 scale) with contour intervals of 10, 20, 50, 100, or 200 feet depending on the terrain. In terms of scale and latitude and longitude, these map...
At this time there is no compiled symbology used for the various scales during different eras. The latest symbology used for the 7.5 minute series can be found at the USGS Topographic map symbols website
Metadata, as described by the Federal Geographic Data Committee, is "the background information which describes the content, quality, condition, and other appropriate characteristics of the data. Paper maps contain metadata, primarily as part of the map...
Yes. FGDC-compliant metadata will accompany each map.
The USGS completed the primary topographic map series of the conterminous United States at the scale of 1:24,000 in 1992. Revisions were made until 2006. Alaska, Hawaii, Puerto Rico, and Trust Territories were done at other scales and will be included in...
The goal of this collection (of historical topographic maps) is to find, catalog, and georeference all topographic maps published by the USGS. The intent is to allow complete access to the content of these maps so the history documented by this...