Spring and summer acquired Thematic Mapper data of a spruce forest growing in southeastern Austria show the normalised differences ND1 and ND3, ratio R41, band differences BD1 and BD3, and the greenness index TMG employing Thematic Mapper bands 1, 3, and 4 best discriminate copper-lead-zinc stress in spruce trees of thirty Thematic Mapper single bands and transformations examined. Stress detection is slightly better in the summer versus the spring scene data.
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