The objective of this study was to develop and evaluate a methodology to measure soil attributes using spectral reflectance (SR) as an alternative to traditional methods. 1.8 shows the average spectral reflectance curves for three typical earth's features: vegetation, soil and water. Plants that are stressed or diseased can also be identified by their distinct spectral signatures. The characteristics of soil that determine its reflectance properties are its moisture content, texture, structure iron-oxide content. The soil curve shows less peak and valley variations. Traditional soil analyses are expensive, time‐consuming, and may also result in environmental pollutants. The spectral reflectance curves for vigorous vegetation manifests the "Peak-and-valley" configuration. Vegetation has a unique spectral signature, but different types of vegetation differ in their reflectance. Whereas in the ... distribution of radiant flux in an illuminating beam; the spectral reflectance of the . The reflectance spectra of minerals are studied as a function of spectral resolution in the range from 0.2 to 3.0 μm. Selected absorption bands were studied at resolving powers (λ/Δλ) as high as 2240. In-situ spectral reflectance of soils was measured at various test sites of India in four spectral bands within the visible and near-infrared wavelength comparable to Landsat Multispectral Scanner (MSS). The leaf pigments, cell structure and water content all impact the spectral reflectance of vegetation. These factors are less dominant than the absorbance features observed in vegetation reflectance spectra. Soil reflectance data can be acquired in the laboratory, in the field and from the air. It’s inexpensive enough to deploy multiple sensors simultaneously. Soil organic matter (SOM) decrease the vis-NIR spectral reflectance range (520–800 nm), especially if the SOM content is bigger than 2% (Stoner and Baumgardner, 1981, Henderson et al., 1992). Spectral Reflectance of Soil The majority of radiation on a surface is either reflected or absorbed and little is transmitted. Humic acid considered the most dark pigment of SOM and reduces the spectral reflectance over the visible to short-wave spectral range. Deploy for months or even years The Spectral Reflectance Sensor (SRS) is a matchbox-sized, multiband radiometer that can be mounted on a fence post, tripod, or meteorological tower. Fig 1.8 Spectral reflectance Curve . Water content based on mass measurements and is expressed in terms of relative volume. And it’s rugged enough to leave in the field for an entire growing season, or longer. Reflectance behaviour of soils under different field conditions was analysed and the spectral reflectance curves for different soil types were obtained. Spectral Reflectance Curves for Natural Grass and Artificial Turf Visible versus Infrared Photos Visible Portion (Panchromatic) Near Infrared Football field has Artificial Turf Typical Spectral Reflectance curves for Vegetation, Soil and Water Lines in the figure represent average reflectance curves VEGETATION (Healthy Green Vegetation) The spectral reflectance curve of bare soil is considerably less variable. Every object on the surface of the earth has its unique spectral reflectance.Fig. Soil Adjusted Vegetation Index (SAVI) Modified Soil Adjusted Vegetation Index (MSAVI) Normalized Difference Moisture Index (NDMI) Normalized Burn Ratio (NBR) Normalized Burn Ratio 2 (NBR2) Landsat spectral indices are under the same constraints as the source Landsat Surface Reflectance products. At resolving powers of approximately 1000, many OH‐bearing minerals show diagnostic sharp absorptions at the resolution limit. Spectral reflectance of soil with different levels of water content (Lobell and Asner, 2002). The reflectance curve is affected by moisture content, soil texture, surface roughness, presence of iron oxide and organic matter. Vegetation Spectral Reflectance Curves .
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