关键词: ASTER, 光谱特征, 土地利用覆盖分类, 有效性评价

Abstract: Three bands of the Visible and Near-infrared (VNIR),6 bands of the Shortwave infrared (SWIR)and 5 ones of the Thermal infrared (TIR)from ASTER satellite data were used to study the spectral features and classification of the land cover in the Queer mountains of the west of Sichuan province,China.Based on the data of surface survey,we also evaluated their quantitative precision and accuracy of spatial distribution.The results indicated that some band combinations of ASTER data are effective on the land cover classification.The classification precisions of the 14 band combination (case 1)after geometric correction was more than 83.9%.In comparison with the result,the precisions of the combination of band no.1,2,3,4,6,9,10 and 13 (case 2),and the one of 1,3,6,8,12 and 14 (case 3),were 76.6%~92.6% and 85.6%~97.5% respectively.The one of band no.1,2,3,4,6,9 (case 4)was not effective on the land cover classification in the mountains.Therefore,the bands of TIR are necessary for the mountains with more than 2000 m relative altitude to classify land cover.From the accuracy of spatial distribution of the land cover types,road,residential land,cropland and rock were easy to be misinterpreted for each other,and rock was also misunderstood as the residential or cropland.

Key words: ASTER, spectral feature, land cover classification, effectiveness evaluation