An improved NDVI-based threshold method for estimating land surface emissivity using MODIS satellite data
文献类型：SCI/SSCI论文
| 作者 | Tang B. H.; Shao, K.; Li, Z. L.; Wu, H.; Tang, R. |
| 发表日期 | 2015 |
| 关键词 | thermal infrared data directional emissivity temperature retrieval algorithm cover evapotranspiration models space |
| 英文摘要 | This work estimated the land surface emissivities (LSEs) for MODIS thermal infrared channels 29 (8.4-8.7m), 31 (10.78-11.28m), and 32 (11.77-12.27m) using an improved normalized difference vegetation index (NDVI)-based threshold method. The channel LSEs are expressed as functions of atmospherically corrected reflectance from the MODIS visible and near-infrared channels with wavelengths ranging from 0.4 to 2.2m for bare soil. To retain the angular information, the vegetation LSEs were explicitly expressed in the NDVI function. The results exhibited a root mean square error (RMSE) among the estimated LSEs using the improved method, and those calculated using spectral data from Johns Hopkins University (JHU) are below 0.01 for channels 31 and 32. The MODIS land surface temperature/emissivity (LST/E) products, MOD11_L2 with LSE derived via the classification-based method with 1km resolution and MOD11C1 with LSE retrieved via the day/night LST retrieval method at 0.05 degrees resolution, were used to validate the proposed method. The resultant variances and entropies for the LSEs estimated using the proposed method were larger than those extracted from MOD11_L2, which indicates that the proposed method better described the spectral variation for different land covers. In addition, comparing the estimated LSEs to those from MOD11C1 yielded RMSEs of approximately 0.02 for the three channels; however, more than 70% of pixels exhibited LSE differences within 0.01 for channels 31 and 32, which indicates that the proposed method feasibly depicts LSE variation for different land covers. |
| 出处 | International Journal of Remote Sensing |
| 卷 | 36 |
| 期 | 19-20 |
| 页 | 4864-4878 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0143-1161 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38483]  |
| 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 | Tang B. H.,Shao, K.,Li, Z. L.,et al. An improved NDVI-based threshold method for estimating land surface emissivity using MODIS satellite data. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
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。