Question

Based on the following spectral signature., which color vegetation, water and bare soil will be seen in a Landsat true color composite image using red (lambda = 0.66 mu m), green (lambda = 0.56 mu m), and blue (lambda = 0.47 mu m) bands and why?

Answer 1

Different objects has different properties of absorption and reflection of sum light. The property of reflection depend on the color, structure and surface features of materials. earth features are amyl by spectral reflectance curve. A curve between percentage of reflection & wavelength. green vegetation: - due to the pigment of plant leaves green vegetation has low reflectance in visible portion between 0.4 - 0.7 mu m, it increases near infrared regions 0.7 - 1.3 mu m we be low reflectance in mid infrared region, it is highly variable, chlorophyll absorb blue and red legit and reflect green light. base soil: - less variable as surface, column features are less offered in soil compared to green vegetation it has high reflection in mid infrared region soil has more concentration of iron oxide so it reflect green and blue light. water curve: - water has more reflectance in visible region after that it has high absorption property in infrared region. therefore these region are easily reflected.