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NDVI (Normalized Vegetation Index), one of the important parameters reflecting crop growth and nutritional information, is applied to remote sensing imagery, according to which, it is possible to know the crop's response to nitrogen in different seasons.quantity demanded, an important guide to the rational application of nitrogen fertilizer.
NDVI - Normalized Vegetation Index: NDVI = (NIR-R)/(NIR+R), or a calculation of reflectance in both bands.
Applications of NDVI
1. Detecting the state of vegetation growth, vegetation cover and eliminating some of the radiation errors, etc;
2, -1visible lightHighly reflective; 0 means there isrocksmaybebare soiletc., NIR and R are approximately equal; positive values, indicating the presence of vegetation cover, and withdegree of coverageincreases as it increases;
3. The limitations of NDVI are manifested by the fact that with thenonlinear (math.)The stretching enhances the NIR and Rreflectivity(used form a nominal expression)contrast (balance of black and white in TV screen setup). For the same image, find separatelyRVIand NDVI will find that RVI values increase at a higher rate than NDVI increases, i.e., the effect of NDVI on highvegetation zoneHas a low sensitivity;
4. NDVI can reflect the plantcanopyof background influences such as soil, wet ground, snow, dead leaves, roughness, etc., and is related to vegetation cover;