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以往用户利用 MODIS数据研究最多的领域是区域以至全球尺度的环境变化 ,而利用 MODIS数据来定量测量地物参数 (如辐射亮度和反射率 )的研究却很少 ,这主要是因为 MODIS数据的空间分辨率低 ,容易造成像元不纯从而影响到数据的精度。但是由于 MODIS数据作为目前光谱辐射精度最高的遥感数据源 ,对于探索遥感定标以及定量遥感具有重要意义。如果所研究地物面积匹配于 MOIDS数据的空间分辨率时 ,那么 MODIS无疑是最好的数据源之一。本文详细讨论了 MODIS数据参数定标原理和在测量地物辐射亮度和反射率中的应用 ,并用 L andsat- 7数据作为参考 ,验证了 MODIS用来测量地物参数的可行性。
In the past, the most research area of MODIS data was environment change at regional or global scale. However, there are few studies on using MODIS data to quantitatively measure the features (such as radiation brightness and reflectance), mainly because of the space of MODIS data Low resolution, easy to cause pixel impure and thus affect the accuracy of the data. However, since MODIS data is the most accurate remote sensing data source for spectral radiance, it is of great significance to explore remote sensing calibration and quantitative remote sensing. MODIS is undoubtedly one of the best sources of data if the studied area matches the spatial resolution of the MOIDS data. This paper discusses in detail the calibration principle of MODIS data parameters and its application in measuring the radiance and reflectance of ground objects, and verifies the feasibility of MODIS to measure the ground object parameters by using L andsat-7 data as a reference.