Gore Range multi-resolution DEMs
Version 1.0, May 4, 2020
Prepared by Tom Patterson, US NPS (retired)
1, 5, 15, 30, 90, 250, 500, 1,000, 2,000, 2,500, and 5,000
Size (height samples)
1,500 x 1,500
Albers Equal-Area / NAD83
Standard parallel 1: 29.5N
Standard parallel 2: 45.5N
Latitude of origin: 23N
Central meridian: 106W
The digital elevation models (DEM) ranging in resolution from 1 to 1,000 meters were obtained from USGS 3D Elevation Program (3DEP). Of these, the 1, 5, and 15-meter DEMs derive from 1 meter LiDAR. The 30-meter DEM derives mostly from the 1 meter LiDAR with 3.3 meter LiDAR filling in peripheral areas. DEMs at 90, 250, 500 and 1,000 meter resolutions derive from other 3DEP sources. The 2,500 and 5,000 meter DEMs originated with 3-arc second data from , which combines USGS 3DEP, Canadian government, and SRTM sources.
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.
Although the DEMs are largely free of artifacts and seams, some still exist. We made no attempt to correct these imperfections. On the one-meter DEM, slight vertical scan lines are visible in the talus slope to left of the lake.
All data used to prepare the DEMs found on this site are from free sources. The DEMs that derive from USGS 3DEP, Canadian government, and SRTM data are in the public domain. The DEMs deriving from have been made available by Jonathan de Ferranti under the Creative Commons Attribution 4.0 International license.