LU Zhong,LEI Guoping,MA Quanlai,et al.Regional Drought Monitoring Based on Reconstructed Landsat 8 Data and Temperature Vegetation Index[J].Research of Soil and Water Conservation,2018,25(05):371-377,384.
基于重构的Landsat 8时间序列数据和温度植被指数的区域旱情监测
- Title:
- Regional Drought Monitoring Based on Reconstructed Landsat 8 Data and Temperature Vegetation Index
- 关键词:
- 区域干旱监测; 土壤湿度; Landsat8时间序列数据; S-G滤波
- 分类号:
- TP79
- 摘要:
- 为了快速且准确地估算大区域范围内土壤水分信息，实现松嫩平原北部区域旱情的监测。基于Landsat 8时间序列数据，计算归一化植被指数（NDVI）和地表温度指数（LST）的时间序列数据，在此基础上利用Savitzky-Golay（S-G）滤波对所得时间序列数据进行了重构，弥补因受云和大气影响而产生的噪声。然后根据重构后的NDVI和LST数据，求得温度植被指数（TVDI）；探讨TDVI和土壤湿度之间的关系，构建土壤湿度反演模型，并结合野外实测数据对模型精度进行了验证。结果表明：（1）S-G滤波可以有效地弥补因受云和大气影响而产生的不足，提高Landsat 8时间序列数据的质量；（2）温度植被干旱指数可以有效地反映土壤湿度状况，经过S-G滤波处理后的数据反演精度更高（RMSE=2.14%）；（3）经过S-G滤波处理后的Landsat 8数据可以更为精确实现大区域范围内时间序列的旱情监测，为区域旱情的监测提供借鉴。
- Abstract:
- In order to estimate the range of large area quickly and accurately in the soil moisture information, realize the monitoring of regional drought in northern Nenjiang, based on the time series data of Landsat 8, we calculated the normalized difference vegetation index (NDVI) time series data and surface temperature index (LST) time series data. The Savitzky-Golay (S-G) filter was used to reconstruct the time series data to compensate for the noise caused by cloud and atmosphere. According to the reconstructed NDVI and LST data, the temperature vegetation index (TVDI) was calculated; on the basis of the relationship between TDVI and soil moisture, soil moisture inversion model was constructed. Finally, combining with the local field data verified the accuracy of the model of soil moisture. The results show that:(1) S-G filtering can effectively compensate for the defects caused by cloud, and improve the quality of Landsat 8 time series data; (2) the temperature vegetation drought index can reflect the soil moisture data effectively; after S-G filtering data, the inversion accuracy of soil moisture is higher(RMSE=2.43%); (3) drought monitoring after S-G filtering Landsat 8 time series data can be achieved within the study area, and provide reference for regional drought monitoring.
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备注/Memo
收稿日期:2017-11-17;改回日期:2017-12-08。
基金项目:农业部公益性行业项目（200903009-2）；教育部博士学科点基金博导类项目（20112325110007）；黑龙江省国土资源科研项目（黑国土科研201411）
作者简介:路中(1990-),男,河南焦作人,硕士,研究方向为土地利用与规划。E-mail:1458835432@qq.com
通讯作者:雷国平(1963-),男,黑龙江省青冈人,教授,博士生导师,主要从事土地利用规划与土地管理研究。E-mail:guopinglei@126.com