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Add Map Service
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Example of the map service:

If Map services is not visible at current map extent. Please zoom in further to see the custom map service.
Cached or tiled map services not projected in New York State Plane Feet, East Grid Zone, North American Datum 1983 (NAD83) will not be rendered in the map viewer.

2 foot Contours
Digital Elevation Model
Digital Surface Model
USGS Topo Basemap (Please zoom in)
USGS 7.5 Quadrangles (Turn on 1:24K Index Layer)

Users can also add map services published by other sources
(i.e., USGS elevation contours map service, http://services.nationalmap.gov/arcgis/rest/services/Contours/MapServer).
The service URL can be copied and pasted in the box above