近三十年云南九大高原湖泊水面面积遥感变化监测

云南省九大高原湖泊对于云南省社会经济可持续发展具有极其重要的意义。利用30 m分辨率的Landsat系列遥感数据和1.5 m分辨率的SPOT6/7遥感数据分别对云南省九大高原湖泊1989,1993,2000,2007,2015年的湖面面积进行了动态监测。结果表明:云南省九大高原湖泊在1989~2015年间总体上较为稳定,湖体湖面面积共减少了约41 km~2(约4%),但各湖变化差异较大。杞麓湖和异龙湖湖面面积持续快速萎缩,至2015年异龙湖已萎缩了1989年湖体湖面面积的40%。其中异龙湖萎缩的主要原因是干旱和围湖造田,而滇池变化波动较大,原因主要在于工业发展及工程治理。通过对同期的Landsat 8OLI数据与SPOT6/7数据解译的杞麓湖和异龙湖湖面面积对比发现不同空间分辨率的解译结果有较为明显差异(2.8%和1.7%),表明在采用多源遥感数据进行湖泊面积解译时需要考虑不同空间分辨率的影响。

REMOTE SENSING MONITORING OF THE NINE PLATEAU LAKES' SURFACE AREA IN YUNNAN IN RECENT THIRTY YEARS

Nine plateau lakes in Yunnan Province are very important for the sustainable socioeconomic development of Yunnan Province. In this study, the Landsat remote sensing data and SPOT6/7 remote sensing data were used to monitor the lakes area of Yunnan Province in 1989, 1993, 2000, 2007, and 2015. The results showed that the area of Yunnan Plateau Lake in 1989~2015 decreased slightly, indicating that the nine plateau lakes area as a whole is stable, however, Qilu Lake and Yilong Lake area continued to shrink, Yilong Lake has shrunk by ca. 40%. The lake area in 2015 were smaller than that in 2007, showing that the continuous drought in recent years had a marked impact on the lake area. The comparison of the nine Lake area in 2015 Landsat 8 OLI data and the SPOT 6/7 solution showed that the results of different spatial resolution were significantly different (even up to 8%), which indicated that the effect of different spatial resolutions on the spatial resolution of the lake area was considered when using multi-source remote sensing data.