Skip to main content

Table 3 Linear and polynomial fitting relationships and inversion accuracy between the four vegetation indices (VIs) and FVC

From: Improving the estimation of alpine grassland fractional vegetation cover using optimized algorithms and multi-dimensional features

VIs Linear fitting Polynomial fitting
Fitting formula R2 RMSE (%) Fitting formula R2 RMSE (%)
NDVI y = 1.276x-0.008 0.717 10.8 y = -2.810x2 + 4.536x-0.859 0.745 9.8
EVI y = 1.212x + 0.269 0.635 12.1 y = -4.955x2 + 5.673x-0.636 0.715 11.8
SAVI y = 1.482x + 0.172 0.665 11.4 y = -6.775x2 + 7.180x-0.921 0.725 10.3
MSAVI y = 1.210x + 0.299 0.642 11.7 y = -5.437x2 + 5.881x-0.600 0.724 10.5