摘要
弄清楚HDF-EOS数据结构和内容及其基本物理量的计算方法是MODIS应用的基础。HDF是NCSA开发、适用于多种计算机平台、易于扩展、主要用来存储各种类型的科学数据。NASA在此基础上,对HDF进行了扩展,开发了专门处理EOS产品的数据格式HDF-EOS。MODIS 1B产品采用HDF-EOS格式存储数据,数据文件包括250、500、1000 m分辨率的定标后的资料以及星载定标器数据及其他工程数据。白天MODIS资料有36个波段,夜间只有17个波段。MODIS 1B产品将MODIS探测得到的数据信号按一定比例缩放为16位整数保存,根据数据集保存的缩放比和截距参数,可以算出反射率和辐射率。
It is essential to understand the structure and content of HDF-EOS data, as well as the calculation method of physical quantities, for applications of MODIS. The HDF-EOS is developed by NASA to manage and distribute EOS data, being set up as the standards of EOS data and information systems. MODIS 1B products adopt the HDF-EOS format, including the calibrated data with the resolutions being 250 m, 500 m and 1000 m, as well as the data from onboard calibrators and other data. There are 36 channels in daytime and 17 channels in nighttime. The detection signals are compressed to a scale into 16-bits integers, and the reflectance and radiance can be calculated by the scales and the offsets.
出处
《气象科技》
2006年第4期505-508,共4页
Meteorological Science and Technology
基金
陕西省气象科研项目"EOS/MODIS遥感资料应用开发"资助
