Experimental system for the study of the directional thermal emission of natural surfaces
文献类型：SCI/SSCI论文
| 作者 | Li Z. L. ; Zhang R. ; Sun X. ; Su H. ; Tang X. ; Zhu Z. ; Sobrino J. A. |
| 发表日期 | 2004 |
| 关键词 | infrared exitance deciduous forest temperatures canopy distributions model angle soil |
| 英文摘要 | A new automatic experimental system was designed to improve the accuracy of multidirectional thermal infrared measurements. This experimental system mainly consists of two identical thermal cameras operating at 8-13 mu m, one metal ring to keep the constant view area for different view angles and a goniometer, which is composed of: (1) a semicircular roadway of 2 m diameter to change the observation angle in the azimuth direction; (2) an elevator of 1 m height to adjust the measuring level to the target level; (3) a rotating arm equipped with one thermal camera for changing the observation angle in the zenith direction; and (4) a fixed arm equipped with another thermal camera to record at nadir the target temperature variation with time during the measurements. The system can be disassembled for easy transport and all of the data acquisition procedures are automatically monitored. For a given azimuth angle, the system needs about 2 minutes to make the directional measurements from about -70degrees to 70degrees, and for completing one hemispheric measurement it needs about 20 minutes if the multidirectional measurements are conducted by a step of 30degrees in the azimuth direction. The preliminary data acquired using our new system on bare soil and winter wheat are displayed and analysed. The results show that the angular variation of surface brightness temperature is measurable and presents some regular directional distribution and can be used quantitatively to study the directional thermal emission of the natural surfaces. |
| 出处 | International Journal of Remote Sensing |
| 卷 | 25 |
| 期 | 1 |
| 页 | 195-204 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0143-1161 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23570]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Li Z. L.,Zhang R.,Sun X.,et al. Experimental system for the study of the directional thermal emission of natural surfaces. 2004. |
入库方式： OAI收割
来源：地理科学与资源研究所
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