Influence of Atmospheric Radiation on Photography

Atmospheric radiation is superimposed on the electromagnetic wave reflected from the ground, which is an atmospheric interference unrelated to the ground and reduces the contrast. It belongs to background noise and is an important content that needs to be corrected.

The most commonly used method of range radiation value is "dark pixel method".

In other words, from multi-spectral remote sensing images, we can find some pixels whose surfaces are covered with pure water and dense vegetation. Because the reflectivity of pure water in the near infrared band (ETM4, 5, 7) is almost zero (solar radiation reaching this part of the water can be completely absorbed, black); The reflectivity of dense vegetation in the red band (ETM3) is also less than 5% (vegetation is at a high absorption peak in the red band and its color is dark); Therefore, the radiation values received by the sensor from these target pixels can be approximately regarded as the contribution of range radiation, and the range radiation values can be calculated.

That's all we can find.