【摘要】：比輻射率是影響地表溫度遙感反演精度的主要因素,是定量熱紅外遙感領(lǐng)域研究的核心內(nèi)容,其與土壤質(zhì)地、土壤成分、土壤水分和土壤粗糙度關(guān)系密切。首先通過(guò)試驗(yàn)方法初步研究了土壤水分和土壤粗糙度對(duì)土壤比輻射率的影響。其次采用傅里葉變換紅外光譜儀觀測(cè)不同水分條件下土壤比輻射率波譜。最后采用基于改變兩次環(huán)境觀測(cè)原理的一種主被動(dòng)漫射式實(shí)時(shí)比輻射率測(cè)定裝置觀測(cè)不同粗糙度條件下8—14μm土壤比輻射率均值的變化。結(jié)果表明,土壤比輻射率隨土壤水分的增加而增加,其中影響最顯著波段范圍是3.3—5.3μm,這個(gè)波段范圍內(nèi)波段平均比輻射率干土與濕土差異大于0.2;影響最小的波段范圍是11—15μm,這個(gè)波段范圍內(nèi)波段平均比輻射率干土與濕土差異在0—0.015之間;在熱紅外波段,8—9.5μm是土壤水分對(duì)比輻射率影響最大的波段,干土與濕土比輻射率差異大于0.05;土壤比輻射率隨著粗糙度的增加略有增加,干土和濕土都有此規(guī)律。
[Abstract]:Specific emissivity is the main factor affecting the accuracy of remote sensing inversion of surface temperature. It is the core content in the field of quantitative thermal infrared remote sensing. It is closely related to soil texture, soil composition, soil moisture and soil roughness. Firstly, the effects of soil moisture and soil roughness on soil specific emissivity were studied. Secondly, Fourier transform infrared spectroscopy (FTIR) was used to observe the soil specific emissivity spectrum under different water conditions. Finally, an active and passive diffusing real-time specific emissivity measuring device based on the principle of changing twice environmental observation is used to observe the mean value of soil specific emissivity of 8-14 渭 m under different roughness conditions. The results show that the specific emissivity of soil increases with the increase of soil moisture, and the most significant band range is 3.3-5.3 渭 m, the difference between dry soil and wet soil is more than 0.2, and the band with the smallest effect is 11-15 渭 m, and the difference between dry soil and wet soil is between 0 and 0.015. In the thermal infrared band, 8-9.5 渭 m is the band with the greatest influence on the relative emissivity of soil moisture, and the difference between the specific emissivity of dry soil and wet soil is more than 0.05, and the specific emissivity of soil increases slightly with the increase of roughness, and both dry soil and wet soil have this law.
【作者單位】： 中國(guó)科學(xué)院地理科學(xué)與資源研究所陸地水循環(huán)及地表過(guò)程重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院研究生院;中國(guó)科學(xué)院地理科學(xué)與資源研究所生態(tài)系統(tǒng)網(wǎng)絡(luò)觀測(cè)魚(yú)模擬重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào):41271380)~~
【分類號(hào)】：S152

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1 涂梨平;利用Landsat TM數(shù)據(jù)進(jìn)行地表比輻射率和地表溫度的反演[D];浙江大學(xué);2006年

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