2012 Volume 51 Issue 2 Pages 118-124
Evaluation of NDVI (Normalized Difference Vegetation Index) derived from a combination of two digital camera images with/without near-infrared lens filter was made by comparing with the NDVI processed from a multi-spectral data of an Earth Observation Satellite, ‘Quickbird'. It was pointed out the importance of the AE (automatic exposure) function of the digital camera and a lens filter blocking infrared light when preparing near infrared and visible red images for derivation of the vegetation index. Results of calculated NDVI from the digital camera images with two filters blocking either visible red light or infrared light were satisfactorily coincident with the NDVI values measured by a spectrophotometer. It was speculated that the primary factor of the difference in histograms of NDVI distribution maps between values from digital camera images and those from the satellite data would be attributed to difference of meteorological conditions anterior to the date of observation.
