The slider also enables you to see the progress of mapping across a desired area or the entire US through time. This feature allows you to or chose a time period by dragging one or both sliders. To see every available map, select “show all” and use the color as a guide to each map scale.Īnother unique addition to topoView is the “timeline” slider at the top of the application. You can select the map scales you’d like to browse, by using the small “map scales” box on the right side of interface. Topographic maps are made in several levels of detail, or scale. In this case, 35 historical topographic map scans are available for selection and download, from 1880 to 2010. By clicking on the “number of maps” circle in the map information box, a list of all availablemaps is displayed.
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