The aim of this study is to analyze the urban land use changes occurred in the central part of Ulaanbaatar, the capital city of\r\nMongolia, from 1930 to 2008 with a 10-year interval using geographical information system (GIS) and very high-resolution remote\r\nsensing (RS) data sets. As data sources, a large-scale topographic map, panchromatic and multispectral Quickbird images, and\r\nTerraSAR synthetic aperture radar (SAR) data are used. The primary urban land use database is developed using the topographic\r\nmap of the study area and historical data about buildings. To extract updated land use information from the RS images, Quickbird\r\nand TerraSAR images are fused. For the fusion, ordinary and special image fusion techniques are used and the results are compared.\r\nFor the final land use change analysis and RS image processing, ArcGIS and Erdas imagine systems installed in a PC environment\r\nare used. Overall, the study demonstrates that within the last few decades the central part of Ulaanbaatar city is urbanized very\r\nrapidly and became very dense.
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