你用肉眼所能看到的最暗的星的亮度值大约是第6级(如果是黑夜的话)，而最亮的星的亮度值是0(更有甚者其亮度值为负)。
The faintest star you can see with your unaided eye is about sixth magnitude (from dark skies) whereas the brightest stars are magnitude zero (or even a negative number).
同时又利用MODIS影像的第1通道和第2通道的亮度值计算出该区域的NDVI值，并将其转化为植被盖度。
At the same time we use the brightness of MODIS band1 and band2 to calculate NDVI of this area, and translate it into coverage of vegetation.
心大星的亮度在天空中位于第15位。
论文第2章介绍了真实感图形的生成过程。真实感图形的生成包括场景造型、取景变换、视域裁剪、消除隐藏面及可见光亮度计算等过程。
Chapter 2 introduces the process of the realistic graphics: situation - model view-change visual threshold -cut hidden-side eliminating and visible bright-ness calculation, etc.
论文第2章介绍了真实感图形的生成过程。真实感图形的生成包括场景造型、取景变换、视域裁剪、消除隐藏面及可见光亮度计算等过程。
Chapter 2 introduces the process of the realistic graphics: situation - model view-change visual threshold -cut hidden-side eliminating and visible bright-ness calculation, etc.
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