Abstract: Exploration Applications of LANDSAT Imagery

By

Floyd F. Sabins, Jr.

The unmanned LANDSAT program has provided high-quality multi-spectral satellite imagery of most of the land areas of the world. Oil and mineral explorationists have acquired numerous images for interpretation, typically using conventional photogeologic techniques. Regional structure, fracture patterns, lineaments, drainage, and tonal anomalies are mapped rapidly and accurately from photographic reproductions of the LANDSAT images.

In addition to photographic reproductions, digital LANDSAT images are available which may be computer processed. Computer processing can enhance images and greatly aid in geologic interpretation. Digital-image processes perform three major functions:

1. Image restoration-to correct for data errors, system noises, and geometric distortions introduced during the scanning, recording, and playback operations.
2. Image enhancement-to alter the visual impact of the image in a manner that improves the information content.
3. Information extraction-to utilize the decision-making capability of the computer to recognize and classify subdivisions of the image on the basis of their digital signatures.

Some examples illustrate the application of these processes for aiding geologic mapping and recognizing potential areas for oil and mineral exploration.

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