中华流行病学杂志
中華流行病學雜誌
중화류행병학잡지
CHINESE JOURNAL OF EPIDEMIOLOGY
2012年
8期
823-827
,共5页
王增亮%朱蓉%张志杰%姚保栋%张利娟%高杰%姜庆五
王增亮%硃蓉%張誌傑%姚保棟%張利娟%高傑%薑慶五
왕증량%주용%장지걸%요보동%장리연%고걸%강경오
血吸虫病%钉螺%遥感%归一化水体指数%植被指数
血吸蟲病%釘螺%遙感%歸一化水體指數%植被指數
혈흡충병%정라%요감%귀일화수체지수%식피지수
Schistosomiasis%Oncomelania hupensis%Remote sensing%Modified normalized difference water index%Normalized difference vegetation index
目的 应用Landsat TM遥感图像,联合应用归一化水体指数(MNDWI)和植被指数(NDVI)定量化确定鄱阳湖区的钉螺孳生地.方法 利用鄱阳湖地区丰水期和枯水期TM卫星遥感图像,分别提取改进型MNDWI,获取“冬陆夏水”区域;同时提取枯水期归一化植被指数,获取有植被覆盖区域,将两者叠加确定钉螺孳生地,最后与现场调查资料进行空间叠加分析提取结果的灵敏度和特异度,并与传统经验提取法比较.结果 在TM卫星遥感图像上,丰水期和枯水期的MNDWI阈值分别为0.34和0.58,枯水期NDVI的阈值为0.02.钉螺孳生地提取结果的灵敏度为95%,特异度为100%,远优于传统经验提取法(灵敏度为75%,特异度为100%).结论 联合应用MNDWI和NDVI,并以客观确定阈值提取钉螺孳生地的方法准确率高,可为血吸虫病的定量化自动监测提供技术支持.
目的 應用Landsat TM遙感圖像,聯閤應用歸一化水體指數(MNDWI)和植被指數(NDVI)定量化確定鄱暘湖區的釘螺孳生地.方法 利用鄱暘湖地區豐水期和枯水期TM衛星遙感圖像,分彆提取改進型MNDWI,穫取“鼕陸夏水”區域;同時提取枯水期歸一化植被指數,穫取有植被覆蓋區域,將兩者疊加確定釘螺孳生地,最後與現場調查資料進行空間疊加分析提取結果的靈敏度和特異度,併與傳統經驗提取法比較.結果 在TM衛星遙感圖像上,豐水期和枯水期的MNDWI閾值分彆為0.34和0.58,枯水期NDVI的閾值為0.02.釘螺孳生地提取結果的靈敏度為95%,特異度為100%,遠優于傳統經驗提取法(靈敏度為75%,特異度為100%).結論 聯閤應用MNDWI和NDVI,併以客觀確定閾值提取釘螺孳生地的方法準確率高,可為血吸蟲病的定量化自動鑑測提供技術支持.
목적 응용Landsat TM요감도상,연합응용귀일화수체지수(MNDWI)화식피지수(NDVI)정양화학정파양호구적정라자생지.방법 이용파양호지구봉수기화고수기TM위성요감도상,분별제취개진형MNDWI,획취“동륙하수”구역;동시제취고수기귀일화식피지수,획취유식피복개구역,장량자첩가학정정라자생지,최후여현장조사자료진행공간첩가분석제취결과적령민도화특이도,병여전통경험제취법비교.결과 재TM위성요감도상상,봉수기화고수기적MNDWI역치분별위0.34화0.58,고수기NDVI적역치위0.02.정라자생지제취결과적령민도위95%,특이도위100%,원우우전통경험제취법(령민도위75%,특이도위100%).결론 연합응용MNDWI화NDVI,병이객관학정역치제취정라자생지적방법준학솔고,가위혈흡충병적정양화자동감측제공기술지지.
Objective With Landsat TM remote sensing images,snail habitats in Poyang Lake region were identified,using two indices:the modified normalized difference water index (MNDWI) and the normalized difference vegetation index (NDVI).Methods Two Remote sensing images of both wet and drought seasons in Poyang Lake region were obtained.MNDWI and NDVI were extracted from the images respectively,to present the regions of “water in summer and land in winter” and the coverage of vegetation.By overlaying those two regions,the areas of potential snail habitats were drawn.Finally,sensitivities and specificities of the recommended methods were assessed and compared to that of the traditional methods for the sake of extracting the areas of snail habitats.Results The threshold values of MNDWI for the wet and drought seasons were 0.34 and 0.58,respectively and the threshold value for NDVI of the drought season was 0.02.Sensitivity and specificity of our method were 95% and 100%,respectively,higher than the conventional approach (se.=75%,sp.=100% ).Conclusion Joint application of MNDWI and NDVI seemed a better method to detect the snail habitats and could be used for the quantitative and automatic surveillance program on snails.