Basic topographic maps (BTM) are topographic maps at scales of 1/5,000, 1/25,000, and 1/50,000 made by the Ministry of the Interior (MOI). The contents of BTM are major national lands’ description including relief, both natural and man-made features, and basic geographic data.
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The BTM mapping began in the year of 1976. Until 2006, there were 4 versions of BTM completed in 1982, 1987, 1994 and 2006 respectively.