This paper aims to improve the efficiency of remote sensing image processing. The reflectance retrieval module developed based on IDL language uses the images obtained by the new DMCIII digital aerial survey instrument, introduces the parameters of the DMCIII camera and various modules of the whole process of multi-thread processing, and analyzes the accuracy by combining the field data collected. It proves the operability and practicability of multi-threaded processing in the whole process.
Based on 116-phase Landsat satellite remote sensing data between 1984 and 2021, this paper inverted the long-term distribution of water quality parameters such as dissolved oxygen (DO), oxidation-reduction potential (ORP), and chlorophyll-a (Chl-a) of the water in Baiyangdian Lake, and analyzed the spatiotemporal distribution characteristics and variations of water quality in Baiyangdian Lake over 37 years. In terms of temporal scale, the inter-annual variation of DO shows certain stability, and the images with the proportion of pollution-free area reaching 90% or more account for 88.7% of the total, showing no pollution in terms of DO; In terms of ORP, the images with the proportion of pollution-free area reaching 90% or more account for 81.2% of the total, showing no pollution to light pollution; the inter-annual variation of Chl-a concentration shows certain volatility, and the overall performance is light-moderate pollution, but the pollution level has been alleviated in recent years; the pollution status of water quality in Baiyangdian Lake in terms of Chl-a and ORP has a certain correlation. In terms of spatial scale, the spatial distribution pattern of DO and ORP is stable, presenting the characteristic that most areas are pollution-free, and a few areas with more frequent human activities show light and moderate pollution.
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