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کامپیوتر و شبکه::
سامانه جهانی زمینپیمایی
WGS 84 world geodetic system 84
Finally, since some LTSs use the World Geodetic System 84 (WGS 84) standard to represent location information, the 3D Cartesian coordinates of the test points should be converted to WGS 84 coordinates and both sets of coordinates stored.
Annex A presents procedures for establishing a local 3D Cartesian coordinate system at a test building and converting coordinates of a point from WGS 84 to local coordinates and vice versa.
For example, consider a situation where the initial location of a person entering a building is estimated with an LTS that is equipped with a GPS/GNSS receiver and the absolute (such as WGS 84) location of the building outer boundary is made available to the LTS.
It would be quite difficult for an LTS to provide user-friendly information about the location of an ELT inside a building if no information whatsoever is available about the building, i.e. when neither the floor plans for the building nor the absolute (such as WGS 84) coordinates of its corners are available3).
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