CAJ | 학술논문

精确提取冰川的轮廓对于计算冰川的面积至关重要。对比分析了3种冰川提取方法。结果表明：最大似然法由于很难将阴影内部的冰川提取出来，所提取的冰川面积偏低；波段运算法的比值法、NDSI法与目视解译法所提取的冰川面积接近，但是目视解译法费时费力；基于NDSI波段运算方法具有运算速度快、结果准确和算法简单等优势。基于NDSI方法提取希夏邦马峰地区的冰川变化结果表明，1990--2010年期间该地区冰川面积在不断退缩，并且有加剧的趋势。
정학제취빙천적륜곽대우계산빙천적면적지관중요。대비분석료3충빙천제취방법。결과표명：최대사연법유우흔난장음영내부적빙천제취출래，소제취적빙천면적편저；파단운산법적비치법、NDSI법여목시해역법소제취적빙천면적접근，단시목시해역법비시비력；기우NDSI파단운산방법구유운산속도쾌、결과준학화산법간단등우세。기우NDSI방법제취희하방마봉지구적빙천변화결과표명，1990--2010년기간해지구빙천면적재불단퇴축，병차유가극적추세。
Accurate glaciers outline is crucial for the calculation of the area of glaciers. Three methods of glacier extraction were analyzed and compared. As it was difficuh to extract glacier by using the maximum likeli- hood classification when the glacier was located in the shadow, so its result was lower than the others. The result of visual interpretation was close to the other methods. But it was time-spending and effort-consuming for visual inter- pretation. Band computing method based on NDSI has the advantages of fast calculating speed, accurate result and simple algorithm. The glacier of Mountain Xixabangma was extracted by NDSI methods and the resuhs showed that the glacier area was retreating continually from 1990 to 2010 with increasing trend.