7.5-minute quadrangle maps that contain topographic change polygons
![7.5-minute quadrangle maps that contain topographic change polygons](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/tc45.gif?itok=VrzzmDq_)
Detailed Description
The USGS 7.5-minute quadrangle maps that contain topographic change polygons. These quadrangles are the ones that are candidates for updated topographic mapping. In fact, a number of these areas have already been updated with the high-resolution, high-accuracy data that have recently been integrated into the NED.
Sources/Usage
Public Domain.