杞麓湖形态时空变化分析及地图可视化

Spatio-temporal Change Analysis and Map Visualization of Qilu Lake Morphology

杞麓湖是滇中高原湖泊的典型代表之一,近年来湖泊形态变化频繁且明显。基于2010—2021年的Landsat卫星影像,提取杞麓湖湖泊面积、湖岸线长度以及湖泊质心等数据,并计算出其他湖泊形态特征指标的数值。结合各年湖岸线的具体形态,对所获取数据的变化趋势及其原因进行分析,得出湖泊形态在时间与空间两个维度上的变化特征。根据专题地图制图的理论与规范,运用“形”“数”结合的方法对研究内容进行可视化表达,绘制杞麓湖湖泊形态的专题地图。

Qilu Lake is one of the typical lakes in central Yunnan Plateau,whose morphology changes frequently and obviously in recent years We extract the lake area,shoreline length of lake and lake centroid data of Qilu Lake with images of Landsat satellite from 2010 to 2021,and calculate the indexes of other lake morphological characteristics The variation trend and its causes of the obtained data is analyzed in combination with the specific morphology of the lake shoreline in each year to obtain the variation spatio-temporal characteristics of the lake morphology According to the theory and standard of thematic cartography,the research content is visualized by the method combining“form”and“data”,and the thematic map of lake morphology of Qilu Lake is mapped.