On 2/16/2011 10:13 PM, Val Kartchner wrote: > What I'm asking about is this anomaly in the area of Sevier Lake: > "http://www.openstreetmap.org/?lat=39.0035&lon=-113.0895&zoom=14&layers=C". What is up with this sudden change in terrain? Most likely the quality or method of creation of the data in this area changes at the 39th parallel.