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Updated: Sep 10, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

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使用Landsat和Sentinel-2卫星观测NO2的量化NOx点源

Daniel J Varon1, Dylan Jervis2, Sudhanshu Pandey3

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America
|June 24, 2024
PubMed
概括

陆地卫星和哨兵-2卫星使用高分辨率图像检测到来自发电厂的二氧化 (NO2) 羽毛. 该方法量化了氧化 (NOx) 排放量,显示季节性趋势和政策影响.

关键词:
空气污染 空气污染氧化物 氧化物时间点来源:点源.远程传感是一种遥感技术.卫星 卫星 卫星 卫星 卫星 卫星 卫星

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Linear Approximations01:23

Linear Approximations

For a differentiable function of two variables, linear approximation estimates values near a known point by replacing the curved surface with its tangent plane. Consider the function\begin{equation*}f(x,y)=x^2+3y^2\end{equation*}near the point (2, 1). The exact value at this point is f(2, 1) = 22 + 3(1)2 = 4 + 3 = 7.The linear approximation of f(x, y)) near (a, b) is\begin{equation*}L(x,y)=f(a,b)+f_x(a,b)(x-a)+f_y(a,b)(y-b)\end{equation*}First, compute the partial derivatives: fx(x, y) = 2x and...