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Pennsylvania at Gettysburg Pennsylvania at Gettysburg (map only) by the Commonwealth of Pennsylvania This is a 1:15,000 map prepared by the Gettysburg National Park Commission under the direction of E. B. Cope for the two-volume book Pennsylvania at Gettysburg. (The rest of the book is not, at present, available online.) The map is primarily concerned with showing the locations of the various monuments to Pennsylvanians on the battlefield, but it is useful from a research perspective for several reasons. First, E. B. Cope, who prepared the map, also prepared the 1863 horseback survey map, and second, it extends farther south than most large-scale maps, all of which tend to derive their information primarily from the 1:12,000 War Dept. maps.
Digital Base Map of Pennsylvania Digital Base Map of Pennsylvania Imagery by the Commonwealth of Pennsylvania This is satellite orthoimagery taken from the Digitl Base Map of Pennsylvania project, which is undertaken under the control of the Pennsylvania Dept. of Conservation and Natural Resources and is associated with a USGS controlled project called The National Map. The scale of this imagery is 1 pixel = 1 foot. The entire imagery collection is available for free download from the PA DCNR website (it is of course extremely large), but that portion of the imagery that displays the Gettysburg battlefield has been assembled from fifteen different plates and is available here as a single image.