Kết hợp ảnh vệ tinh Landsat 8 và Sentinel 2 trong nâng cao độ phân giải không gian nhiệt độ bề mặt=Combined use of Landsat 8 and Sentinel 2 images for enhanced spatial resolution of land surface temperature

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Thông tin xuất bản: TC Khoa học trái đất và môi trường – ĐH Quốc gia Hà Nội, 2018

Mô tả vật lý: tr.54-63

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ID: 474289

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Land surface temperature is one of the most important factors in studying urban heat island, monitoring forest fire and coal fire as well as input parameters for climate models. Ground-based observations reflect only thermal condition of local area around the stations and in fact cannot establish the number of meteorological stations with expected density due to the high cost. Remote sensing technology with advantages such as wide area coverage and short revisiting interval has been used effectively in the study of land surface temperature distribution. However, due to the spatial resolution of thermal infrared band is low, land surface temperature calculated from satellite images, such as Landsat and Aster is not applicable to small-scales area effectively. This paper presents the results of a study of combining multi-resolution remote sensing data, including Landsat 8 and Sentiel 2A satellite imagery, to enhance the spatial resolution of land surface temperature. The results show that, in the case of combining Sentinel 2 and Landsat 8 images, the spatial resolution of land surface temperature is increased to 10m, compared to 30m in the case of using only Landsat 8 data. For the two experimental areas, comparison of the lowest and highest land surface temperature as well as the 10 random test points showed that, the difference between land surface temperatures in the case of combining Landsat 8 and Sentinel 2 and in the case of using only Landsat 8 images are negligible.Nhiệt độ bề mặt là một trong những yếu tố quan trọng nhất trong nghiên cứu hiện tượng đảo nhiệt đô thị, giám sát cháy rừng, cháy mỏ than cũng như là thông số đầu vào cho các mô hình khí hậu. Các quan trắc mặt đất chỉ phản ánh điều kiện nhiệt của khu vực cục bộ xung quanh trạm đo và trên thực tế cũng không thể thiết lập nhiều trạm quan trắc với mật độ dày do chí phí cao. Công nghệ viễn thám với những ưu điểm vượt trội như diện tích vùng phủ của một ảnh rộng, chu kỳ cập nhật ngắn đã được ứng dụng hiệu quả trong nghiên cứu sự phân bố nhiệt độ bề mặt. Mặc dù vậy, do độ phân giải không gian ở các kênh hồng ngoại nhiệt thấp, nhiệt độ bề mặt xác định từ các ảnh vệ tinh như Landsat, Aster thường khó áp dụng hiệu quả cho các nghiên cứu ở quy mô nhỏ. Bài báo này trình bày kết quả kết hợp ảnh vệ tinh Landsat 8 và Sentinel 2 trong nâng cao độ phân giải không gian nhiệt độ bề mặt. Kết quả nhận được cho thấy, trong trường hợp kết hợp sử dụng ảnh vệ tinh Sentinel 2 và Landsat 8, độ phân giải không gian của nhiệt độ bề mặt được nâng cao lên 10 m so với 30 m khi chỉ sử dụng ảnh Landsat 8. Đối với 2 khu vực thử nghiệm, so sánh giá trị nhiệt độ thấp nhất và cao nhất cũng như tại 10 điểm kiểm tra ngẫu nhiên cho thấy, độ chênh lệch nhiệt độ bề mặt khi kết hợp ảnh Landsat 8 và Sentinel 2 so với phương pháp truyền thống chỉ sử dụng ảnh Landsat 8 là không đáng kể.

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