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Contour lines, or lines which connect points of equal elevation, are drawn on a topographical map in order to display the elevation at any point on the map.
If you want to learn more about the data click on the arrow located in the upper left-hand corner of the map frame or on the points/lines located on the map to enable a pop-up that will show you more information. You can also click on the "View in ArcGIS Online" link to see the data in the arcgis viewer and/or add your own data to the map.
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Alternatively, you can copy and paste the Service URL to connect to these services through ArcGIS, QGIS, or any other open source software. For more information on the various ways to view/connect to this data, please read our Data Use Instructions(PDF, 364KB).
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