On a basis of the reference frame of the Republic of Latvia are Common Nordic Observation GPS Campaign's performed in 1992 and 2003. Measurements have been worked out to establish and control 0 class points in Latvia. In these campaign's a correlation between Europe Reference Frame and geodetic coordinate system of Latvia LKS-92 is established. It is possible to compare and estimate correlation parameters of the instruments used. It is possible to compare and analyze influences and errors affecting geodetical measurements. It is possible to calculate deaf of the continent.
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