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LiDAR & Satellite Incorporated Application(47)
A Studied Case
HyMAP and LiDAR Data in Deep Study & Practice(1)
Radiances Sorted by Bands for further Study(1)
Figure 1
Figure 2
Figure 3
In this section, investigating radiance from leaf at ground is performed by studying high vegetation (5).
As seen from Figure 1, radiance at ground for a whole observed area is negative, which can be found from band = 4 within VIS region. However, the positive radiance appears, which can be found from band =6. As illustrated in previous section 39 and 40, at least, some bio-cells start to emit energy (radiation) from initial state, thus after photons (flux) are absorbed by them (chlorophylls).
In the process of the absorbed solar energy being emitted, it can be discovered that
1. The energy is not completely emitted out of system (bio-cell) at one time.
2. The energy digitalized, and it accompanies with the variation of internal energy change from higher state to lower until zero when band =18 (see Figure 4).
3. Because such phenomenon occurs within VIS region, it can be predicted that the solar energy absorbed by all chlorophylls are released until band = 18 from them.
4. From band = 20, thermal emission enters red edge region, in which fluorescence takes place (see section 37).
6. It is clear that the solar radiation (photon flux) absorbed by chlorophylls is conducted to other parts in leaf accompanying with water (molecular) diffusion. The part of absorbed energy is also used to evaporate water as well, which is to be discussed in section 55 later.
