CAJ | 학술논문

选取安徽省西南部的沿江平原和皖南山区为研究区,以Landsat8 OLI影像为数据源,基于面向对象的思想,比较阈值法、谱间关系法、NDWI指数、MNDWI指数、EWI指数法、CIWI指数法、PRWI指数法在平原地区和山地地区的水体信息提取的优势与不足. 试验结果表明,7种方法均可以有效提取,综合来看,阈值法较适合平原地区的水体信息提取,谱间关系法适合山地地区的水体信息提取,MNDWI指数和阈值结合水体指数法较适合平原地区的水体信息提取. 从精度评价角度看,阈值法提取OLI影像的水体信息效果最差, MND-WI指数提取的水体信息精度最高.
선취안휘성서남부적연강평원화환남산구위연구구,이Landsat8 OLI영상위수거원,기우면향대상적사상,비교역치법、보간관계법、NDWI지수、MNDWI지수、EWI지수법、CIWI지수법、PRWI지수법재평원지구화산지지구적수체신식제취적우세여불족. 시험결과표명,7충방법균가이유효제취,종합래간,역치법교괄합평원지구적수체신식제취,보간관계법괄합산지지구적수체신식제취,MNDWI지수화역치결합수체지수법교괄합평원지구적수체신식제취. 종정도평개각도간,역치법제취OLI영상적수체신식효과최차, MND-WI지수제취적수체신식정도최고.
This study took plain area and mountain area in Anhui province as an exsample and based on Landsat Oli image,comparatively studied from three aspects:discrimination,water error rate and area accuracy on the single-band threshold method,the multi-band spectral relationship method,ND-WI and other four normalized water indexes:MNDWI,EWI,CIWI and PRWI,to show accuracy rating of extracting water information. The results indicated that all of six methods can extact water informa-tion. But the single-band threshold method,MNDWI and PRWI are better at extracting water informa-tion from plain area. The multi-band spectral relationship method is better at extracting water infor-mation from mountain area. On area accuracy asprect,the single-band threshold method is the worst method of extracting water information of OLI image. MNDWI is the best method of extracting water information of OLI image.