Digitally Enhanced Visual Displays Facilitate The Analysis Of Landsat Imagery

Robert N. Colwell

doi:10.1117/12.931773

28 July 1981 Digitally Enhanced Visual Displays Facilitate The Analysis Of Landsat Imagery

Robert N. Colwell

Proceedings Volume 0271, Advances in Display Technology II; (1981) https://doi.org/10.1117/12.931773
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

Digital records of scene brightness, as recorded by Landsat's 4-band multispectral scanner (MSS), were enhanced and displayed in full color on a CRT and also in color print form. Digital enhancements, made through the use of appropriate algorithms, entailed corrections for (1) satellite roll, pitch, yaw and variations in heading; (2) scale variations caused by earth curvature, variations in satellite altitude and changing scan velocity of the MSS mirror; (3) radiometric variations resulting from variable gains within the MSS components; and (4) striping caused by an occasional repetitive malfunction of the MSS detectors. To facilitate the identification and mapping of wildland resource features, and thereby to provide resource managers with much needed information, several known image examples of each resource category were extracted from this enhanced, band-ratioed imagery and compiled into reference materials known as "image analysis keys". Through the proper visual display of these keys image analysts attempted to identify other examples of these same kinds of resource features on the digitally enhanced Landsat imagery. Conclusions regarding the increased identification accuracies achievable by such means are presented.

Citation Download Citation

Robert N. Colwell "Digitally Enhanced Visual Displays Facilitate The Analysis Of Landsat Imagery", Proc. SPIE 0271, Advances in Display Technology II, (28 July 1981); https://doi.org/10.1117/12.931773

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