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Updations of topographic features in a map were mainly based on Aerial photographs and ground surveys. Since that time, huge population growth and urban development have resulted in continuously expanding infrastructure and urban settlements. In addition, environmental factors including desertification, deforestation, flooding, and erosion have dramatically changed the land use and topography of some parts of the world.

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Maan, G. S., Garg, V., Rawa, S. D., & Singh, A. (2019). Updation of Topographic Features Using Landsat-7 Images. History Research Journal, 5(6), 1233-1247. Retrieved from