Backround

The purpose of this lab was to compare DEMs portrayed at different resolutions. Specifically, 2m, 5m, 10m, 30m were used to begin the analysis. Each resolution of the DEMs are used in various purposes and scenarios to make a potential project for an employer. The higher the resolution of a DEM does not necessarily make it a suitable fit for all projects or analyses. Though a pretty alternative to the 30m DEM, the 2m is a prime example of how DEMs will have different uses and are not always the best fit for certain jobs. Sometimes a project requires a general overview of a landscape and not a finer view, which is where the lower resolution DEMs come in to use.

Elevation Comparison:

The location of the point on the DEM Type/Resolution Comparison Map is located at the UTM coordinates 448472 E, 4494280 N. The highest point's elevation per each DEM resolution is as follows:

2m------->3195.3

5m------->3194.5

10m----->3194.2

30m----->3188.8

The discrepancies in the elevation are due directly to the resolution. As you can see, the higher the resolution the easier it is to pin point the are of highest elevation. Cell sizes are enlarged at higher scales thus creating inaccuracies.

CREDITS: gis.joewheaton.org