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Bookmark or Share- Emissivity - NeutriumIntroduction. Emissivity ( $\epsilon$ ) is the ratio of radiation emitted by a surface to that emitted by a blackbody at the same temperature. As a blackbody emits the maximum amount of radiation possible over all wavelengths, emissivity lies in the range $0 \lt \epsilon \le 1 $ .
- Emissivity - WikipediaIn its most general form, emissivity can be specified for a particular wavelength, direction, and polarization. However, the most commonly used form of emissivity is the hemispherical total emissivity, which considers emissions as totaled over all wavelengths, directions, and polarizations, given a particular temperature. [13]: 60
- Emissivity - Humboldt State UniversityThe emissivity (ε) of a material is the relative ability of its surface to emit heat by radiation. Emissivity is defined as the ratio of the energy radiated from an object's surface to the energy radiated from a blackbody at the same temperature. Emissivity values can range from 0 to 1.
- Emissivity – absorption, black body, thermal radiation - RP PhotonicsThe emissivity of an object or a surface is a measure for how strongly it interacts with thermal radiation in terms of emission and absorption. It can have a value between 0 and 1, and it can be dependent on the optical frequency or wavelength, also on the direction of incidence and the polarization of light.
- 比辐射率 - 百度百科比辐射率是反映物体 热辐射 性质的一个重要参数，与物质的结构、成份、表面特性、温度以及电磁波发射方向、波长 (频率) 等因素有关。 求地表比辐射率的方法主要有差值法、独立温度光谱指数法 (T IS I) 和 NDVI 门槛值法 (NDV ITHM) 等方法。 地球表面不同区域的地表结构虽然很复杂，但从卫星像元的尺度来看，主要由水面、植被和裸土 3 种地物类型构成, 故利用覃志豪等人 NDVI 门槛值法来估算地表比辐射率。 而由于 AVHRR （NOAA 气象卫星是近极地、与太阳同步的卫星）数据分辨率较低，根据 Van de Griend 等人的经验公式确定 [2]。 “科普中国”是为我国科普信息化建设塑造的全... 中国气象学会，英文全称...
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