USGS - science for a changing world

Significant Topographic Changes in the United States

Quantification of the Effects of Topographic Changes

Results Info
Quantification of the Effects of Topographic Changes

Hydrologic Effects

Visual Impacts

Regional Differences in the Effects of Surface Mining

Proximity of Topographic Change Areas to Other Features

Comparison with Land Cover Status and Trends Data

Error Sources, Uncertainty, Limitations, and Uses
The terrain parameters measured for each feature in the topographic change inventory are useful for describing the surface modifications at the specific locations of the polygons. However, in many cases the individual change polygons are members of a larger set that collectively represent a surface disturbance distributed over an area greater than that of any of the individual polygons. These groups of change polygons produce cumulative effects on the environment, and quantification of the effects of the changes must consider the numerous polygons together. The effects of changes over areas more broad than the scale of individual polygons are quantified below.

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Page Last Modified: December 08, 2015