Fig. 6From: Method for accurate multi-growth-stage estimation of fractional vegetation cover using unmanned aerial vehicle remote sensingPROSAIL-based VNAI–SIs 2-D scatter maps. a VNAI–NDVI, b VNAI–NDVI2, c VNAI–RDVI, d VNAI–SAVI. SI spectral index, RDVI renormalized difference vegetation index, SAVI soil-adjusted vegetation indexBack to article page