Research on the Datum of Guangzhou Land-Sea Unified Surveying and Mapping and Calculation of Depth Datum
In order to establish a land-sea unified surveying and mapping datum in Guangzhou,this paper mainly combines the exist-ing domestic and foreign methods and keys to establish aland-sea unified surveying and mapping datum,and introduces the technical ideas of establishing the land-sea unified surveying and mapping datum in Guangzhou,and selects the estuary of the Pearl River as the test area to carry out the calculation of the depth datum,the key step of establishing the land-sea unified surveying and mapping datum.The experimental results show that the closer the tidal station at the the Pearl River estuary is,the closer the depth datum is.At the same time,the depth datum changes from far to near the inland.The closer the tidal station is to the inland,the higher the depth datum is.It is concluded that the calculation results of the depth datum at the estuary of the Pearl River are reliable,which can be used as a basis for the establishment of a land-sea unified surveying and mapping datum in Guangzhou.
land-sea unified surveying and mapping datumdepth datumPearl River estuary
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