Chapter 6

Remote Sensing in Precision Agriculture

RGB Remote Sensing

RGB sensors are the most common imaging sensors for plant measurements. They capture plant images in the visible part of the EM spectrum in three broad bands (Red, Green, and Blue). A combination of Blue (≈400–500nm), Green (≈500–600nm), and Red (≈600–700nm) would form an RGB image. RGB images are generally easier to interpret because they appear similar to how and what human eyes see. RGB images are useful to quantify the morphological traits of crops, such as vegetation cover, height, width, biomass, and growth dynamics.

Applications of RGB Remote Sensing in Precision Agriculture

RGB sensors are extensively used for studying phenomena in which plants show visual symptoms, such as diseases that affect the color composition of the leaves and visible pests or fungi on the leaves. While multispectral sensors offer a wider range of bands, including infrared, allowing for more detailed analysis, RGB sensors provide a simpler, more accessible option for analyzing plant characteristics using visible light. Several RGB-based vegetation indices, like VARI (Visible Atmospherically Resistant Index) and TGI (Triangular Greenness Index), can be useful for monitoring plant health and detecting changes in vegetation.

Limitations of RGB Remote Sensing in Precision Agriculture

While RGB cameras offer invaluable insights through high-resolution, color-accurate images, they rely only on the visible light spectrum. This spectrum restriction means they can’t detect information that lies beyond human vision, such as infrared or ultraviolet light, limiting their utility in applications requiring detailed analysis of plant health or soil properties

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