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a ‘geoid’ means the equipotential surface in the gravity field of the earth, which coincides with the undisturbed mean sea level extended continuously through the continents.
’geoidilla’ tarkoitetaan maan painovoimakentän tasa-arvopintaa, joka yhtyy valtamerien kohdalla häiriintymättömään keskimääräiseen merenpintaan ja mannerten kohdalla sen kuviteltuun jatkeeseen.
a surface to which elevations and/or depths (soundings and tide heights) are referred. for elevations commonly a level (equipotential) surface, approximately the mean sea level is used, for depths in many cases low water. 6 differential gps (dgps) a form of gps in which the reliability and accuracy are enhanced by broadcasting a time-varying correction message from a gps monitoring receiver (differential mode) at a known position on shore. the corrections are fed automatically into the gps receiver onboard and used to compute an improved position.
korjaukset syötetään automaattisesti aluksella olevaan gps-vastaanottimeen ja niiden perusteella lasketaan tarkempi sijainti.