Indices

The PIC Spectral Imaging Indices (PIC-SII) captures data on crop uniformity, vigor, and irrigation by utilizing the reflectance of the Visible and Infrared wavelengths light.

Hyperspectral Vigor Index (HVI)

  • Based on analysis of narrow bands in visible red through near-infrared
  • Highly sensitive to canopy chlorophyll content and plant vigor
  • Effectively discriminates healthy from stressed vegetation
  • Discriminates crop canopy from ground cover and other materials
  • Brighter green color indicates higher vigor

Greenness Image (GRN)

Similar to a natural color photograph, but:

  • Suppresses overall brightness variations
  • Enhances true color differences
  • Highlights green vegetation

Hyperspectral Photochemical Index (HPI)

  • Indicates level of leaf photochemical activity based on xanthophyll pigment absorption in the visible green region
  • Positively correlated with photosynthetic light use efficiency (LUE)
  • Inversely related to instantaneous heat stress
  • Brighter green color indicates higher photoactivity conducive to vigorous growth

PIC Products Under Development

  • Water content index
  • Red blotch & leafroll disease indicators
  • Thermal imagery
PIC Products Under Development

Zone Vigor Map

  • Provides a “macro-level view” of vigor variations within a vineyard, for use when vine-level detail is not desired
  • Allows rapid visual evaluation of uniformity within varietal blocks
  • Indicates spatial zones where vine growth and vigor are suboptimal
Zone Vigor Map