CAJ | 학술논문

高分辨率遥感图像是大比例尺石漠化遥感解译工作的重要信息源。文章以云南省鹤庆县为研究区,采用2011年 RapidEye 多光谱遥感影像,在对灰岩与针叶林—草体混合标准光谱曲线及不同裸岩率亮度值剖面曲线分析的基础上,运用波段比值法和密度分割法,结合野外现场踏勘和地理底图,开展大比例尺石漠化遥感解译,获得如下调查结果：全县石漠化面积为188.82 km2,占全县总面积的8.13%,占岩溶面积的25.48%,其中重度面积有10.31 km2,占石漠化总面积的5.46%,中度面积有42.28 km2,占石漠化总面积的22.39%,轻度面积有136.23 km2,占石漠化总面积的71.15%。野外验证石漠化等级判对率为84%,达到技术规范要求,这表明文章采用的方法可有效运用于大比例尺岩溶石漠化信息的提取。
고분변솔요감도상시대비례척석막화요감해역공작적중요신식원。문장이운남성학경현위연구구,채용2011년 RapidEye 다광보요감영상,재대회암여침협림—초체혼합표준광보곡선급불동라암솔량도치부면곡선분석적기출상,운용파단비치법화밀도분할법,결합야외현장답감화지리저도,개전대비례척석막화요감해역,획득여하조사결과：전현석막화면적위188.82 km2,점전현총면적적8.13%,점암용면적적25.48%,기중중도면적유10.31 km2,점석막화총면적적5.46%,중도면적유42.28 km2,점석막화총면적적22.39%,경도면적유136.23 km2,점석막화총면적적71.15%。야외험증석막화등급판대솔위84%,체도기술규범요구,저표명문장채용적방법가유효운용우대비례척암용석막화신식적제취。
Heqing county is located in northwestern Yunnan Province,the southwestern margin of the Yang-zi platform,E 100°01′~100°29′and N25°57′~26°42′,the southern end of the traverse mountains in western Yunnan and the east of the Yunling range.Karst mountainous plateaus and basin landforms dominate this region with a total land area of 2,323.54 km2 ,including exposed carbonate rock 741 km2 ,representing typi-cal karst rocky desertification (KRD for short).The research on KRD is of great significance to soil erosion management and improvement of geological and ecological environments in Heqing county.The KRD inter-pretation based on high-resolution remote sensing images is one of the important methods in large-scale in-vestigations to this phenomenon.At present,visual interpretation is still the main approach for KRD inter-pretation with high-resolution remote sensing images.To improve the accuracy and speed of the KRD inter-pretation,a method of band ratio and density slice for KRD investigation is proposed.This study took Heqing county as an example and RapidEye multispectral remote sensing image of 201 1 as information source.On the basis of standard spectral curves of limestone and conifer-meadow mix,and combining with analyzing profile curves of different rock coverage DN values,we applied the band ratio and density slice method to investigation of large-scale KRD in Heqing county.After indoor interpretation,we went to the field to validate the accuracy of the interpretation results and modify them.At last,we obtained the KRD da-ta of Heqing county.The investigation results show that the area of KRD in Heqing county is 188.82 km2 , which accounts for 8.13% of the whole county area and 25.48% of the karst area.The area of severe KRD is 10.31 km2 ,which accounts for 5.46% of the total KRD area.The moderate KRD area is 42.28 km2 ,which accounts for 22.39% of the whole.And the mild KRD area is 136.23 km2 ,accounting for 71.15%.Through the field validation,the correct ratio of KRD interpretation is 84%,which can meet the interpretation de-mand and the technical specification.So it is concluded that the band ratio and density slice method can be applied to large-scale KRD remote sensing investigation effectively.