Large Collection of Topographic Maps of Harford & Cecil County Available on USGS Historical Map Explorer

The U.S. Geological Survey (USGS) and Esri, a geographic information technology company, have partnered to make the enormous collection of the Survey’s map readily available to everyone. While these resources have been downloadable on the Internet since September 2011, this new, user-friendly website is a significant improvement over the original system, which was more complicated.

The explorer brings to life more than 178,000 maps from 1884 to 2006, allowing users to easily access geo-referenced images, which can also be used in web mapping applications. The timeline allows visitors to easily explore the collection by place, time, and scale, and the sheets are easily downloaded.

Use of the landing page is simple. Visitors enter the desired location in a query box, and once you click on the map a convenient timeline comes up, showing the survey for that place. The user is able to visual see the products that were produced over time and move along the line to see the changes over time.

Check this out, as you will find lots to help with your local and family history research,

Click here to go to the map explorer.

Darlington in 1950, after the construction of the Conowingo Dam.

Darlington in 1950, after the construction of the Conowingo Dam.

The Darlington area before the Dam in 1900.  You are able to zoom in and download these products.  Note the timeline at the bottom showing the available products.

The Darlington area before the Dam in 1900. You are able to zoom in and download these products. Note the timeline at the bottom showing the available products.

The modern edition base map is used to locate your point of interest.

The modern edition base map is used to locate your point of interest.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s