This elevation data began with the NED data for the Colonial NHP region. However, a couple of the quads in the NED dataset were of noticeably lower quality. This was not only visually jarring, but did not inspire confidence in the results of the hydrological models we were running on the dataset.

We were able to overcome this problem by using the 2 foot contour data from York County. It was converted to a TIN, then a raster, and this raster was merged into the existing raster to create a more cohesive elevation dataset.

The project was the joint effort of Mark Lehman and Dave Frederick