The effect evaluation of the Grand Canal and the river chief system based on GF-2 image
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Abstract:
The Grand Canal is an important cultural heritage in China,which has important economic,ecological and cultural significance.With the development and utilization of water resources,water pollution is becoming a serious issue.Government at all levels implement the river chief system to ensure the sustainable development of water resources and promote the protection and inheritance of the Grand Canal.Therefore,remote sensing information technology is applied to the investigation and evaluation stage of the river head system to monitor the temporal and spatial changes of the river basin. With the support of remote sensing and geographic information system technology,based on Gaofen-2 remote sensing image,the change of water body and vegetation coverage in the core monitoring area of the Grand Canal from 2015 to 2019 was analyzed.First,the two types of land use,water,and vegetation are extracted and the change of area in the time interval is analyzed.Then,according to the high-resolution image of Google Earth,validation samples are generated to verify the accuracy,and the classification accuracy meets the research requirements.Finally,the landscape pattern index was used to analyze the changing trend of each landscape in the study area.From 2015 to 2017,the vegetation area decreased by 82.94 km2,accounting for 38.82% of the original area,and the water area decreased by 0.01 km2.From 2017 to 2019,the vegetation area increased by 205.53 km2,accounting for 157.27% of the originalarea,and the water area increased by 1.79 km2,accounting for 10.86% of the original area.The total number of plaques first increased and then decreased,and the patch density fluctuated greatly.Edge density,aggregation degree,weighted average shape index also showed an upward trend.On the whole,the establishment of the construction team of the Grand Canal cultural belt and the river chief system by the staff of Beijing Municipality has achieved good results in the strict control of the water quality and the greening along the Grand Canal. The qualitative and quantitative evaluation of the comprehensive treatment results of the Beijing section of the Grand Canal is realized,and the actual situation of the study area is directly reflected through remote sensing images and column statistical charts.Combined the results with the landscape pattern index analysis of the study area,the scientificity and accuracy of the evaluation process are ensured,mobilizing the enthusiasm of the staff,reducing the risk of corruption to a certain extent,and promoting innovation of China′s administrative system.
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