Transmission method for depth datum plane for water depth measurement

Abstract

The invention discloses a transmission method for a depth datum plane for water depth measurement, and belongs to the field of hydrographic surveying and charting. The transmission method comprises the following steps: carrying out wave effect correction and static draft correction on ground high-water-level data measured by a ship-mounted GNSS during water depth measurement, carrying out calculation by using observation data in a drift time period and a depth measurement period, separating out dynamic draft, calculating a clear ground height reflecting a water level change, then calculating a datum plane deviation between a reference ellipsoidal surface and a local depth datum plane in a measurement region through the least square fitting method, so as to convert a ground high water level measured by the ship-mounted GNSS onto the local depth datum plane in the measurement region, and finally, carrying out water level control on a water depth measurement result through the converted water level, so as to convert the water depth measurement result onto the local depth datum plane. The method is easy to operate, reliable in quality, can accurately reflect a relative change of the water level in the measurement region, is relatively high in conversion precision and has a certain application value.

Description

technical field [0001] The invention belongs to the field of marine surveying and mapping, and in particular relates to a transfer method of a depth reference plane for bathymetry. Background technique [0002] In marine surveying and mapping, the commonly used vertical datums include local mean sea level, depth datum, elevation datum, etc. In hydrographic surveying, the depth datum is used as the starting plane for water depth, and in land surveying, the elevation datum is used as the starting plane for elevation. noodle. In order to meet the demand, my country has established a series of tide gauge stations along the coast from south to north, and calculated the depth datum in each region. However, because the vertical position of the depth datum is related to the local tidal range, the depth of my country's sea area The datum is not seamless and continuous, and the conversion relationship between the depth datum and the elevation datum in the coastal waters has not been f...

AI Technical Summary

Problems solved by technology

However, in small and medium-sized marine bathymetry or seabed topographic survey projects, it is often faced with the situation that some measurement areas are far away from the shore (15-40km), it is inconvenient to arrange tide stations on the side of the sea area, and there is no suitable datum deviation model. The working distance of the shore tide gauge station is limited, and the water level cannot be effectively controlled, resulting in the inability to perform datum conversion through the method of elevation or depth fitting

However, if the datum deviation is regarded as a constant, it will lead to a large conversion error

Therefore, in this case, it is impossible to accurately convert the bathymetry results of the survey area to the local depth datum, which brings difficulties to the bathymetry work

In response to this situation, the current common solution is to set up a self-contained tide gauge station on the seabed of the survey area, but this method has limitations such as high cost, unstable data, and easy loss

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