Churfirsten multi-resolution DEMs
Version 1.0, May 21, 2020
Prepared by Tom Patterson, US NPS (retired)
30, 60, 120, 250, 500, 1,000, and 2,000
Size (height samples)
2,500 x 1,500
Bonne / WGS84
Latitude of origin: 47.25N
Central meridian: 9.4E
All digital elevation models (DEM) derive from data. The 30, 60, 120, and 250 meter DEMs derive from 1-arc second data. The 500, 1000, and 2,000 meter DEMs derive from 3-arc second data.
The processing of DEMs occurred in Natural Scene Designer Pro, QGIS, and Geographic Imager software and involved converting between NSD, IMG, ASCII Grid, and TIF formats. Slight elevation variations exist, ranging up to a few decimeters, between DEMs in each of the multi-resolution series. We used bicubic interpolation for downsampling and did not apply additional filtering or generalization to the DEMs.
Numerous horizontal artifacts are present in the 30m DEM and are most noticeable in flat areas. We made no attempt to correct these imperfections.
The DEMs deriving from have been made available by Jonathan de Ferranti under the Creative Commons Attribution 4.0 International license.