Gore Range multi-resolution DEMs

Version 1.0, May 4, 2020

Prepared by Tom Patterson, US NPS (retired)

Resolutions (meters)

1, 5, 15, 30, 90, 250, 500, 1,000, 2,000, 2,500, and 5,000

Size (height samples)

1,500 x 1,500

Center point

39.7377625N, 106.3282392W

Projection

Albers Equal-Area / NAD83

Standard parallel 1: 29.5N

Standard parallel 2: 45.5N

Latitude of origin: 23N

Central meridian: 106W

Data Sources

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 ViewFinderPanoramas, which combines USGS 3DEP, Canadian government, and SRTM sources.

Data processing

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.

Data issues

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.

License

Creative Commons Attribution 4.0 International

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 ViewFinderPanoramas have been made available by Jonathan de Ferranti under the Creative Commons Attribution 4.0 International license.