Spectral reflectance of Soil, Vegetation & Water. Spectral reflectance of Vegetation. In the case of vegetation, light absorption by leaf pigments dominates the reflectance spectrum in the visible region (400–700 nm). Spectral Reflectance of Water Typical effects of chlorophyll and sediment on water reflectance: (a) Ocean water, (b) turbid water and (c) water with chlorophyll Compared to vegetation and soils water has lower reflectance. In its liquid state, water has relatively low reflectance, with clear water having the greatest reflectance in the blue portion of the visible part of the spectrum. The reflection of soil is influenced by factors such as moisture, texture and mineral composition, soil … The manner of interaction is described by the spectral response of the target. Vegetation may reflect up to 50%, soils up to 30-40% while water reflect at most 10% of the incoming radiation. Water has high absorption and virtually no reflectance in near infrared wavelengths range and beyond. Electromagnetic Spectrum: Spectral Signatures Spectral Signatures PowerPoint Presentation PowerPoint Presentation PowerPoint Presentation General example of a reflectance plot for some (unspecified) vegetation type with the dominating factor influencing each interval of the curve indicated: Vegetation Vegetation Soil PowerPoint Presentation Water PowerPoint Presentation Water and vegetation may reflect somewhat similarly in the visible wavelengths but are almost always separable in the infrared. The spectral reflectance … Chlorophyll pigments a and b selectively absorb blue (400–500 nm) and red (600–700 nm) wavelengths for photosynthesis. Figure 4: Vegetation Spectral Reflectance Curves, image source: gsp.humboldt.edu. Turbid water has a higher reflectance in the visible regio… Spectral reflectance of Vegetation. Examples of spectral signatures for soils, litter, and vegetation are shown in Figure 11.4. SPECTRAL SIGNATURE CONCEPTS-TYPICAL SPECTRAL REFLECTANCE CHARACTRISTICS OF WATER, VEGETATION AND SOIL: A basic assumption made in remote sensing is that a specific target has anindividual and characteristic manner of interacting with incident radiation. •Beyond 1.3 μmenergy incident upon vegetation is essentially absorbed or reflected with little to no transmittance of energy •Dips in reflectance occur at 1.4, 1.9 and 2.7 μm because water in the leaf absorbs strongly at these wavelengths (water absorption bands) •Reflectance peaks occur at about 1.6 μmand 2.2 μm, between the … image source: seos-project.eu . When solar radiation comes into contact with an object, three activities namely; reflection, absorption and transmission are bound to take place, moreover, in this case we focus more on the reflection and absorption of the incident radiation as it yields significant data of our areas of interest. Figure 3: Reflectance of Vegetation at different wavelength and comparison with Soil and Water. Reflectance at near infrared wavelengths is also negatively related to soil moisture; an increase in soil moisture will result in a particularly rapid decrease in reflectance due to water (H20) and hydroxyl (HO) absorption features at 0.9 μm, 1.4 μm, 1.9 μm, 2.2 μmand 2.7 μm.