Technical note - A procedure for obtaining green plant cover: relation to NDVI in a case study for barley

This paper describes a procedure for obtaining green plant cover from crop digital pictures. However, the appearance of shades caused by vegetation ca nopy characteristics, in addition to different coloration from several part s of the plant during the maturity process, makes evaluation difficult, esp ecially when separating green vegetation from dry vegetation. In order to b roach this problem., a methodology has been developed to obtain green plant cover. An experience in field radiometry is described where different aver age spectra have been captured for each experimental plot at the same time as pictures were taken, obtaining the Normalized Difference Vegetation Inde x (NDVI) for each one of the spectra. Finally we observe the relation betwe en NDVI and green plant cover.