缨帽变换在抚仙湖水面变化分析中的应用

Application of Tasseled Cap Transformation in Fuxian Lake Area Changes Analysis

为了获得近15年抚仙湖水面面积变化情况及影响因素,基于2000 -2015年长时间序列Landsat ETM＋和OLI共5景遥感影像,利用缨帽变换及密度分割技术快速准确地提取了云南省抚仙湖水体信息,自动绘制矢量边界,并结合研究区年平均气温及降水量资料,分析了抚仙湖水面变化的影响因素.通过ETM＋和OLI传感器参数、各波段灰度直方图对比研究以及实际运用发现,缨帽变换图像处理技术应用于OLI影像具有可行性,提取水体信息效果良好;2000年以来抚仙湖水面面积总体缩小明显,且与该区年平均气温、年降水量变化趋势一致.总体说明气候因子对抚仙湖水面变化影响较大,两者之间关系显著;2015年抚仙湖面积有所增加,反映了云南旱情状况有所减轻.

To analyze the Fuxian Lake area variations and the factors of these changes during recent 15 years period, Landsat ETM ＋ and OLI imageries from 2000 to 2015 were used to extract water body and boundary information and the factors were discussed with climate data in the area. Through the sensor parameter and each bands gray histogram comparison of OLI and ETM ＋ and practical application found that tasselled cap transformation image processing used in OLI image is feasible and extracted water body information works well; The Fuxian Lake area had decreased distinctly since 2000, and was consistent with the annual mean temperature and annual precipitation trends. As a whole, climate had great influence on the changes of lake area; Increased of Fuxian Lake area in 2015 reflected that the drought situation in Yunnan was relieved.