Relationship of Vegetation Indices and Leaf Area Index of Fraxinus griffithii C.B.Clarke. in The Royal Project Area, Chiang Mai Province

Abstract

The objective of this research was to analyze the relationship of Vegetation Indices and Leaf Area Index (LAI). The methodology was held by analysis of 13 vegetation indices from LANDSAT 8 OLI satellite image. Analysis of LAI with Hemispherical photographs from forest canopy in research tree plots by using full frame camera with fish eye lens, and then LAI was analyzed by software. The tree plots are Fraxinus griffithii C.B. Clarke. in 7 royal project stations from 28 plots including Mok Cham station, Kae Noi station, Nong Kiew station, Huy Luk station, Nong Hoy station, AngKang station and Pang Da station in Chiang Mai province. The result of this study found that Vegetation Indices which are NDVI, Ratio, Sqrt, TNDVI, NDWI, Brightness, Greenness, Wetness and EVI have relationship with LAI. NDWI and LAI showed the highest relationship with correlation coefficients 0.623 (r = 0.623, p ≤ 0.01). Examination with linear and polynomial equations found that Greenness and LAI have the highest relationship by polynomial equation with coefficient of determination 43.62 (R² = 0.4362)