Topographic survey is a research activity to assess the natural surface conditions on the ground at the expected area for planning, designing, volume excavation calculation and embankment work.
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Topographical mapping is to determine the relative positions of measured objects (topographical characteristics, terrain, architectural works) on the field and then use the map symbols to represent them on the plane according to a certain ratio.
When measuring and drawing the topography, it is necessary to base on the national control landmarks, thereby settup the project control network to serve the detailed measurement of the terrain.
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