Variability of Ndvi Agricultural Used Areas

One of the possibilities offered to us by the remote sensing, is to monitor all the vegetation. Therefore agricultural plants can be monitor as well. From the spectral point of view, the presence of vegetation induces a significant increase of reflectance in IR part of the spectra. The main topic of this research project was to evaluate the changes in reflectance in chosen agriculturally used land in time. A field (61 ha) which belongs to University agriculture enterprise in Žabčice (Czech Republic, 48°59 ́11′′N 16°37 ́40′′ E, 175 m above sea-level) was chosen as an experimental area for our project. Aerial photography was done by mid-format camera Hasselbland H1 in two spectral bands (RED, 630-690 nm a NIR, 750-900 nm) and in the following time periods: June 2004 (twice), July 2005 and May 2006. Based on these data, we were able to create an orthophotomap (pixel size = 10 x 10 m), determine NDVI and calculate a correlation between the reflectance of both spectral bands within the period of monitoring. In the case of winter wheat, a high dependence (correlation factor = 0.70) between RED and NIR bands was observed in June 2004 and May 2006. Interestingly, within the same period of monitoring, the similar correlation was observed also in the case of NDVI. Based on these results, one might expect that if the same crop-plant, land management and growth period would be used, the values of RED, NIR and NDVI of agricultural crop-plants on this particular field might be estimated.