基于Landsat数据的1988—2018年东莞湿地演变的遥感分析

Remote Sensing Analysis of Dongguan City Wetland’s Changes from 1988 to 2018 Based on Landsat Images

以东莞市为研究区,利用多时相卫星遥感数据,采用面向对象结合目视解译的方法获取1988年以来6期湿地分布信息,并分析其时空变化特征和驱动因素。结果表明:1988—2018年东莞市湿地总面积总体呈现先增加后减少的趋势,在2000年达到最大值373.27 km^(2),占东莞市总面积的15.38%,后总面积不断减少,到2018年减至227.82 km^(2),占东莞市总面积的9.39%。东莞市在研究期间主要体现出的湿地转换特征是河流湿地流失并转换为非湿地地物,以及鱼塘湿地的快速变化。驱动因素分析表明人类活动是对东莞市湿地变化最重要的影响因子。分析结果可以为更好地调控和优化东莞市自然资源提供数据支持和决策辅助。

In this paper,Dongguan city is selected as the research area.Six temporal satellite remote sensing data from 1988 to 2018 are acquired to classify the wetlands.Object-oriented method combined with visual interpretation is adopted to obtain the spatial distribution information.The spatial-temporal change characteristics and driving factors are discussed.The results showthat from 1988 to 2018,the total area of wetland in Dongguan showed a trend of increasing first and then decreasing,reaching a maximum of 373.27 km^(2) in 2000,accounting for 15.38% of the total area of Dongguan.After that,the total area continuously decreased to 227.82 km^(2) in2018,accounting for 9.39% of the total area of Dongguan.During the study period,the wetland transformation characteristics of Dongguan city mainly are the river wetland loss and the conversion to non-wetland,as well as the rapid change of fish pond wetland.The analysis of driving factors shows that human activity is the most important factor influencing the wetland change in Dongguan.The analysis results can provide data support and decision support for better regulation and optimization of natural resources in Dongguan.