摘要
定量反演植被盖度是评价土地荒漠化程度的重要手段。以科尔沁沙地为研究对象,选择Landsat5-TM遥感影像数据,在定量反演荒漠化地区植被盖度时,对大气校正前后的归一化植被指数(NDVI)的变化进行对比研究,并对所建立的植被盖度的遥感信息模型进行精度比较。研究表明:对于科尔沁沙地,运用大气校正后图像计算出的NDVI,采用三次拟合曲线建立的植被盖度的遥感信息模型,其实际精度相应提高约11%。
Land desertification of NDVI is the key method to assess the grade of land desertification, Taking the Horqin sandy land in Inner Mongolia as its research object, it chooses data from the landsat5-TM remote sensing image. When the vegetation coverage of the desertification area of the quantitative inversions, it takes the methods of Atmospheric Radiation Correction, then it makes contrast analysis on the changes before and after the atmosphere correction normalized vegetation index （NDVI）. Furthermore, it carries out precise comparison on the information of the established remote sensing model. The research indicates that as for the Horqin sandy land in Inner Mongolia, the precision will improve 11 96 correspondingly if NDVI, which is counted through the image of atmosphere correction and the model of the remote sensing information model through building curves fitting of three indexes, is adopted.
出处
《黑龙江工程学院学报》
CAS
2006年第2期23-26,共4页
Journal of Heilongjiang Institute of Technology
基金
黑龙江省教育厅科学技术研究资助项目(10551262)
关键词
大气校正
荒漠化
遥感信息模型
atmospheric scattering
desertification
remote sensing information models
