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Open-File Report 95–654

Exploratory Analysis of Environmental Interactions in Central California

By Lee De Cola and Neil Falcone

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As part of its global change research program, the United States Geological Survey (USGS) has produced raster data that describe the land cover of the United States using a consistent format. The data consist of elevations, satellite measurements, computed vegetation indices, land cover classes, and ancillary political, topographic and hydrographic information. This open-file report uses some of these data to explore the environment of a (256-km)² region of central California. We present various visualizations of the data, multiscale correlations between topography and vegetation, a path analysis of more complex statistical interactions, and a map that portrays the influence of agriculture on the region's vegetation. An appendix contains C and Mathematica code used to generate the graphics and some of the analysis.

First posted 1995

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Suggested citation:

De Cola, Lee and Falcone, Neil, 1995, Exploratory analysis of environmental interactions in central California: U.S. Geological Survey Open-File Report 95–654, available only online at

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