Air pollutants can cause serious effects on human health, especially fine particles in air, which can easily cause respiratory diseases, such as asthma and bronchitis, and also increase the probability of lung cancer and heart disease. The disease surveillance of the residents around the chemical plant is an effective means to understand the effects of the discharged pollutant on the health of the surrounding residents. The research area, Shanghai Chemical Industry Park is located at the junction of Jinshan and Fengxian, as the South Center of the six industrial bases of Shanghai. Applying the spatial distribution of population obtained from the extraction of residential land by using GF-2 data, and the disease data after cleaning treatment, can reach to the spatial distribution of the above two diseases. Through the integration of spatial characteristics and attribute characteristics, the disease surveillance of the surrounding residents can be realized, which directly reflects the impact of chemical industry on the health of the surrounding residents.
Mean Solar Exo-atmospheric Irradiances (ESUN) is an important parameter to calculate the apparent
reflectance based on the satellite sensor measured DN values. GF-4 was launched in 2015, the ESUN
of this satellite has not been officially reported, however. To determine which solar spectrum curve is
best fitted to GF-4, this study calculated the ESUN of GF-1 at first, by using six distinct solar spectrum
curves and spectral response curves of GF-1. Next, the results were validated by comparing with the
operational released values. It indicates that the World Radiation Center (WRC) solar spectrum is the
most accurate and reliable solar spectrum curve for GF-1, with a total error less than 0.1% for 4 bands.
Finally, the ESUN of GF-4 was calculated by making use of the WRC solar spectrum curve.
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