If you think you’ve found an error in USGS elevation data, please send an email to firstname.lastname@example.org. We will add the reported information to our "Digital Elevation Model Issues" data log for further analysis and possible correction.
Spikes, pits, seam-line anomalies, and other data errors are of concern to us. We are working to correct or minimize known issues, but it will take some time. Errors might not be fixed until new LIDAR or IFSAR is collected over the area.