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USGS / U. S. Army Map Service

United States 1:25,000 United States 1:25,000 / 1:24,000 by the USGS / U. S. Army Map Service. This is a series of 1:25,000 / 1:24,000 maps published by the U. S. Geological Survey and U. S. Army Map Service starting in the mid-twentieth century. The maps in the series were repeatedly revised and re-published in the decades that followed. The large scale of these maps makes them suitable for battlefield research, although of course care must be taken when used for battles which occured decades before they were made. Typically they are best used in combination with period maps, which lack the topographic information and accurate scales of these maps. At present, the online collection includes only the battlefields of Gettysburg and Antietam. (Note: the 1:50,000 map series was started decades earlier than the 1:25,000 series, and so although it is less detailed than the 1:25,000 series, it remains valuable for ACW research.)
United States 1:50,000 United States 1:50,000 / 1:62,5000 by the USGS / U. S. Army Map Service. This is a series of 1:50,000 / 1:62,5000 maps published by the U. S. Geological Survey and U. S. Army Map Service starting in the early twentieth century. The maps in the series were repeatedly revised and re-published in the decades that followed. The large scale of these maps makes them suitable for battlefield research, although of course care must be taken when used for battles which occured decades before they were made. Typically they are best used in combination with period maps, which lack the topographic information and accurate scales of these maps. At present, the online collection includes only the battlefield of Gettysburg and Antietam. (Note: the 1:50,000 map series was started decades earlier than the 1:25,000 series, and so although it is less detailed than the 1:25,000 series, it remains valuable for ACW research.)
United States Imagery USGS Satellite Imagery by the United States Geological Survey This is satellite orthoimagery taken from The National Map project, which is undertaken under the control of the United States Geological Survey. The scale of this imagery is approximately 5 pixel = 1 foot. The images are a layer (hidden by default) of the 1:24,000 topographic maps available for free download from the USGS website. At present, the online collection includes only the battlefield of Antietam. (There is a higher resolution image available for Gettysburg, also on this website, produced as part of the Digital Base Map of Pennsylvania Project.)