Research on spectral data consistency of flue-cured tobacco canopy under different spatial and temporal condition

In order to determine the optimal spatial and temporal conditions for flue-cured tobacco spectral measuring, the data of canopy spectral reflectance and coefficient of variation in different spatial and temporal scales were analyzed using K326 as test material. The results showed that the canopy spectral reflectance variation coefficient during the time 10:00 -12:00 was the lowest and the data consistency reached a fairly high level; the differences of canopy spectral reflectance consistency between probe height 1.0 m and 1.5 m in the visible band (460-710nm) were not-significant, but their data consistency were significantly better than the those with probe height 0.5m; the spectral data consistency of probe height 1.5 m were the best in near infrared band (760-1 650 nm), followed by the spectral data of probe height 1.0 m, the spectral variation coefficient of probe height 0.5m was the highest and the data consistency was the worst. All the analysis shows that, probe height 1.5 m and the measuring time during 10:00-12:00 was the optimal spatial and temporal conditions for flue-cured tobacco spectral measuring.