THỬ NGHIỆM XÂY DỰNG CHƯƠNG TRÌNH HIỆU CHỈNH ẢNH HƯỞNG  CỦA ĐỊA HÌNH TRÊN ẢNH VỆ TINH - TRƯỜNG HỢP THỰC HIỆN  CHO ẢNH LANDSAT-8 TRÊN NỀN TẢNG GOOGLE EARTH ENGINE

Pham Tien Dung; Pham Van Duan; Vu Thi Thin

Authors

Pham Tien Dung Viện Nghiên cứu Lâm sinh - Viện Khoa học Lâm nghiệp Việt Nam
Pham Van Duan Viện Sinh thái rừng và Môi trường - Đại học Lâm nghiệp
Vu Thi Thin Viện Sinh thái rừng và Môi trường - Đại học Lâm nghiệp

Keywords:

Terrain correction,, Google Earth Engine,, landsat-8,, SRTM DEM

Abstract

Adjusting terrain on a satellite image is adjusting of the spectral reflection value of the image channel in the areas affected by the terrain shadow caused by the slope and lighting conditions of the sun. In this study, the authors inherited and analyzed models commonly applied to adjust the terrain on satellite imagery from which to select representative models to build a program to adjust through programming on Google Earth Engine. The programs were developed to test to adjust Landsat-8 images in Lak district, Dak Lak province. Adjusting results by different models were compared by visualized analysis and statistical analysis in order to select a suitable model for terrain adjusting in the area. The results have selected 4 models, including: cosine model, C model, solar sensor model (SCS) + C and experimental model to test and build an adjusting program, in which the experimental model was evaluated as the most suitable for adjusting the terrain in the area, the second one is model C or model (SCS) + C. Using the adjusting program built by experimental models to adjust the terrain on Landsat-8 images in Cao Phong District, Hoa Binh Province; Ba Che district, Quang Ninh province; Nhu Thanh district, Thanh Hoa province; Tan Phu district, Dong Nai province showed relatively suitable adjusting results allowing the application of this adjusting program to adjust the terrain on Landsat-8 images in Vietnam.

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