RESULTS OF THE EXPERIMENT ON SPECTROMETRY OF VEGETATION AND SOILS BY USING MODIFIED CAMERAS
The article presents the results of experiments on spectrometry of vegetation and soil samples using Avantes S41 (LaserLS), Hamamatsu C10083CAH spectrometers and Sony NEX and Canon A495 digital cameras modified into multispectral two-channel cameras. The purpose of this study is to develop a method that allows you to obtain objective spectral data (for example, NDVI index images - Normalized Difference Vegetation Index) using multispectral cameras. We have developed two methods for obtaining spectral data for the subsequent calculation of the values of the vegetation index NDVI from them: the two-frame and single-frame survey methods. The two-frame method involves shooting one multispectral camera in two channels in separate frames in monochrome mode, the first frame is shot in the near infrared range, and the second in the visible light range. As a result of filming, we received two photos, one shot in the infrared spectrum, and the other in red. The single-frame method involves shooting with one multispectral camera in two channels in one frame. That is, the infrared and visible spectrum data are in different color channels of the same image, the blue channel of the camera receives NIR radiation, and the red channel receives RED. Shooting is done with one filter (red or orange). Based on the data obtained, NDVI index images are calculated. Cross-calibration of the data measured by multispectral cameras and spectrometers Hamamatsu C10083CAH and Avantes S41 (LaserLS) was carried out. An analysis of the results allows us to talk about the promise of field spectrometry methods of vegetation and soils using modernized cameras.