A dimension that exactly locates a reference point, reference line, or reference plane
To select a suitable datum, consider a stable reference point on the workpiece or surface. Mark the datum clearly and securely. When marking out, ensure all measurements and reference points are taken from this datum to maintain accuracy and consistency. Working from a different datum can lead to incorrect measurements, misalignments, and errors in the final product. It is crucial to avoid this by consistently using the established datum.
Datum is an imaginary vertical plane from which all horizontal measurements are taken with the aircraft in a level flight attitude.
When utilizing the DAGR, the field that automatically displays the waypoint datum is the "Dat" field, which stands for datum. The datum represents the reference point used to define the location coordinates of the waypoint.
The horizontal datum used by GPS is the World Geodetic System 1984 (WGS 84). It provides a consistent reference frame for defining positions on the Earth's surface.
A land surface datum is a reference point used to measure elevations on the Earth's surface. It provides a standardized starting point for determining heights and depths in a specific area, often used in mapping and surveying to ensure consistency in measurements. Common examples include the North American Vertical Datum (NAVD) and the Mean Sea Level datum.
Fuselage stations are normally referenced from a reference datum which some distance forward of the first fuselage component. The reference datum normally relates to a precisely defined point on the manufacturers jig. Nominating a datum forward of the first airframe component allows for some flexibility in any redesign of the nose. Also the reference datum has to be off the airframe because the dimensions of the airframe itself will vary with temperature - unlike the jig on which it is made
A datum in land surveying is a known point or elevation used as a reference when measuring and mapping the land. It serves as the basis for establishing the positions of other points, helping to ensure accuracy and consistency in surveying work. Common datums include the North American Datum (NAD) and the World Geodetic System (WGS).
Datum shift refers to the adjustment of coordinates from one geographic datum to another. This is necessary when working with maps or geographic data collected using different reference points, such as changing from NAD27 to WGS84. Datum shifts ensure that spatial information is accurately aligned across different datasets.
It is a fixed reference point whose elevation above a given datum line
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Archaeologists use a datum point to establish a consistent reference point for all measurements during excavations. This helps ensure accuracy and precision in recording the vertical and horizontal positions of artifacts and features. By having a fixed point of reference, archaeologists can maintain spatial relationships within the site.