A method to retrieve subpixel fire temperature and fire area using MODIS data | |
Qian Y. G. ; Kong X. S. | |
2012 | |
关键词 | spectral mixture analysis identification resolution emissions algorithm savanna |
英文摘要 | Methods for retrieving subpixel fire temperature and fire area have been developed over several years, but the retrieval accuracies of these methods require further improvement. In this study, a channel of the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor centred at 2.1 mu m and associated with the MODIS 4.0 2.1 mu m channel is used to retrieve the temperature and area of fires. To test the feasibility of using the 2.1 mu m channel for retrieval, the fire contribution ratios of MODIS 2.1, 4.0 and 11.0 mu m channels are first examined using simulated surface radiance. Considering the difficulties in obtaining real-time validation data and in evaluating the retrieval accuracies, simulated MODIS data are used for this study. A modified method, which combines MODIS 2.1 and 4.0 mu m channels, is introduced and described in detail. Compared with the traditional method, which utilizes a combination of 4.0 and 11.0 mu m channels (Dozier 1981), the results show that the 2.1 mu m channel is more sensitive to active fires and the large area of fires than the 11.0 mu m channel, but is less sensitive to smouldering fires and small fires. The modified method that we propose has better performance and higher accuracy in active fires (temperature >= 800 K) and in large fires (area >= 0.5%). However, the traditional method is more accurate for smouldering fires and small fires. Finally, a sensitivity analysis is performed to estimate the uncertainty in assessing fire temperature and area. Experimental results indicate that under realistic conditions (fire temperatures of approximately 1000 K and a fire fractional area greater than 0.005), the retrieval errors for fire temperature and fire area are +/- 35 K and 20%, respectively. |
出处 | International Journal of Remote Sensing |
卷 | 33 |
期 | 16 |
页 | 5009-5025 |
收录类别 | SCI |
语种 | 英语 |
ISSN号 | 0143-1161 |
内容类型 | SCI/SSCI论文 |
源URL | [http://ir.igsnrr.ac.cn/handle/311030/26815] ![]() |
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 | Qian Y. G.,Kong X. S.. A method to retrieve subpixel fire temperature and fire area using MODIS data. 2012. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论