Shades of gray were observed in two ERTS images off northern Chile coastal waters. These photographs were reproduced in band 5, combined with high-density yellow false colour (diazo) images; afterwards they were contrasted against several physico-chemical and biological oceanographic variables. A probable relationship was established among the shades of gray detected, and coastal upwelling of equatorial subsurface water. The significance of this correlation to fisheries-oceanography is discussed, as part of a national policy towards the use of remote sensors in the seach of natural resources.
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Robles, F. L. E., Ulloa, A. L., & Pineda, J. R. (1977). Análisis de dos fotografías ERTS como posibles indicadores de surgencia costera en la zona norte de Chile. Investigaciones Geográficas: Una Mirada Desde El Sur, (24), Pág. 49–79. https://doi.org/10.5354/0719-5370.1977.27357
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