Machinery & Energetics

The application issues for monitoring the nitrogen state of the GoPro Hero 4 camera with a standard (optical) and infrared lens are considered. The aim of the work was to evaluate the spectral characteristics of the camera with an infrared filter and the possibility of using it to monitor the state of nitrogen nutrition of maize. An instrumental evaluation of the spectral channels of the GoPro Hero 4 optical camera was made. It was determined that when the IR lens was used, radiation was fixed on two channels of 640– 690 nm, that is, in fact a part of the "red" part of the optical spectrum and a channel of 820–880 nm of the infrared range. The possibility of creating stress indices for corn is shown when using an infrared lens. The experience of comparative calibration of a digital camera with a reference camera is shown. With the instrumental evaluation of the spectral channels of the GoPro Hero 4 camera with an infrared lens, a fixation for any of the channels of the "red" component of the spectrum is established, with the ratio of IR and optical components individually for each channel. It is determined that the infrared range is more preferable when monitoring the state of nitrogen nutrition of maize. A spectral index is proposed for the use of an IR filter for a standard UAV camera.

UAV, indices, nitrogen nutrition, corn, NDVI