| 利用Landsat 7与GF-1 WFV影像反演地表温度 |
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| 引用本文： | 符宝玲,琚锋,赵伟忠,许星.利用Landsat 7与GF-1 WFV影像反演地表温度[J].测绘通报,2021,0(11):124-127,135. |
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| 作者姓名： | 符宝玲 琚锋 赵伟忠 许星 |
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| 作者单位： | 1. 湖州市测绘院, 浙江 湖州 313000;2. 河海大学, 江苏 南京 210000 |
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| 摘 要： | 地表温度在地气循环系统中具有重要作用，是目前地理学研究的重点。然而目前的国产高分辨率影像缺少热红外波段，且具有热红外波段的影像分辨率较低。基于此，本文利用低分辨率影像降尺度方法反演高分辨率影像的地表温度。首先通过Landsat 7影像的热红外波段，提取典型地物的地表温度；对GF-1 WFV影像进行预处理后，利用全约束最小二乘法对高分辨率影像进行混合像元分解；根据平均温度模型，得到高分辨率影像的地表温度，并进行降尺度，通过Landsat 7影像进行精度验证。验证结果显示，均方根误（RMSE）为1.40℃，平均绝对误差（MAE）为0.44℃，精度较高。
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| 关 键 词： | 地表温度 像元分解 降尺度 GF-1 WFV |
| 收稿时间： | 2020-10-12 |
Land surface temperature inversion based on Landsat 7 and GF-1 WFV images |
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| FU Baoling,JU Feng,ZHAO Weizhong,XU Xing.Land surface temperature inversion based on Landsat 7 and GF-1 WFV images[J].Bulletin of Surveying and Mapping,2021,0(11):124-127,135. |
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| Authors: | FU Baoling JU Feng ZHAO Weizhong XU Xing |
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| Institution: | 1. Huzhou Institute of Surveying and Mapping, Huzhou 313000, China;2. Hohai University, Nanjing 210000, China |
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| Abstract: | Land surface temperature (LST) is the focus of geographical research and plays an important role in the earth-atmosphere system. However, the domestic high-resolution image lacks thermal infrared band, and the image resolution of thermal infrared band is relatively low. Based on this, a low resolution image downscaling method is proposed to retrieve high-resolution land surface temperature. Firstly, the surface temperature of typical objects is extracted from the thermal infrared band of Landsat 7 image. After preprocessing the GF-1 WFV image, least squares under the full constrained method is used to decompose the high-resolution image into mixed pixels. According to the average temperature model, the surface temperature of the high-resolution image is obtained. The root mean square error (RMSE) is 1.40℃, the mean absolute error (MAE) is 0.44℃, and the precision is verified with Landsat 7 image. |
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| Keywords: | surface temperature pixel decomposition downscaling GF-1 WFV |
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