基于eCognition的山区地类变化浅析——以岷江上游茂县为例

Change of Land Category in Mountain Area Based on eCognition——As an Example of Maoxian County in the Upper Reaches of Minjiang River

通过利用eCognition软件分别对地震前2005年、地震后2015年两个年度该研究区的遥感影像进行自动解译,将地类分为居民地、耕地、裸地、水体、植被五类。在自动解译础上进行野外调查、国土部门调查纠正得出10年来岷江上游茂县地区的以上地类变化和目前地质灾害分布情况。结果显示居民地相比增长21.6%,耕地面积增长18.01%,裸地面积相比增长28.6%。并根据遥感解译的解译结果统计居民地面积计算出2005年茂县人口为103 428人,2015年茂县人口为119 290人,计算结果与2005年实际人口误差为3.4%;与2015年实际人口误差为5.9%。

The remote sensing images of Maoxian County obtained in 2005 before the earthquake and in 2015 after the earthquake are interpreted automatically via eCognition and the land use of this area can be divided into residential land,arable land,bare soil,bodies of water,and vegetation.The field survey and land department investigation for the past ten years outline the main changes of land use types and distribution of geological disasters in this area.The research shows that the residential area is increased by 21.6%,the arable land area is increased by 28.6%,while the bare soil is increased by 18.01%.According to the interpretation of the remote sensing,the population in 2005 is 103 428,while it is119 290 in 2015.The tolerance between the calculated population and the actual population is 3.4% and 5.9% respectively.