Tree canopies associated with ___ TCARI/OSAVI values

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BlackTom AI · Accepted Answer

Consider the question about tree canopies and their association with TCARI/OSAVI values. 
Option 1: Positive. This is the correct interpretation because TCARI/OSAVI is a normalized difference index used to assess chlorophyll content and canopy density. Higher, positive values generally correspond to healthier, denser tree canopies with more chlorophyll and leaf area, while the index is designed to minimize soil background effects, making positive values a reliable indicator of canopy presence and vigor. 
Option 2: Negative. In typical remote sensing analyses of vegetation, TCARI/OSAVI values are not interpreted as indicating canopy presence when they are negative. A negative value would usually reflect atypical combinations of soil brightness, shadows, or soil-plateau effects, or measurement noise, rather than a standard sign that corresponds to a canopy. Since the standard interpretation ties canopy presence and health to positive TCARI/OSAVI values, labeling canopies as associated with negative values mischaracterizes the index behavior. 
Thus, the statement that tree canopies are associated with Positive TCARI/OSAVI values aligns with the established interpretation of the index, whereas Negative does not.

AGRI30045_2025_SM2 Practical 5: Estimation of Plant Traits (VIs)

Tree canopies associated with ___ TCARI/OSAVI values

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