Search

When a new Local Geodetic Network (LGN) should be established, some “old” geodetic points with coordinates [XY] fromthe present point field are used and contemporaneously some necessary “new” points are established in the area of LGN. Theirapproximate coordinates [X°Y°] are determined using competent measurements and computations.If the coordinate determinations of new points are correct and the coordinates of old points are without points decompabilities,the new LGN with all properties can be correctly determined using a convenient adjustment.If new network–points are not correctly determined (some distances and angles badly measured, other injurious influences),the adjustment results are not acceptable. (large residuals V, large coordinate standard deviations ˆ, ˆ, X Y s s etc.). In such falls thereis necessary to search for causes of the bad results in the network-adjustment. Occurrence of such a situation can be found in big valuesof some quantities oi i i dL = L − L of the vector dL ( i L - measured quantities as distances, angles, …; oiL - their approximative values.The wrong (large) i dL will ambiguously identify in the adjustment the distances, angles and the corresponding approximativecoordinates, which are unacceptable.Such situations are characteristic for:• Least Squares Adjustment (LSA),• Iteratively Reweighted Robust LSA (IRRLSA),as they are applicable for identification of wrong results in the adjustments

The quality of Local Geodetic Network (LGN) for technical and scientific purposes is very important from many points of view. These netsrequire compatible points (given and new ones), measurements among points without blunders and reliable determination of approximatecoordinates for the new (to be established) points. If some from the 3 mentioned requirements is not fulfilled for the network computation,the various results from the net adjustments are defective and unusable. In the present treatise, all requirements for faultless measurements areintroduced and demonstrated in adjustments of a trilateral net using the standard, constrained adjustment (GMM of full rank with minimumconstraints) and the interactively reweighed Least-Square Robust Adjustment. From analyses of their solutions can be by convenient introducedmethods determined and identificy all errors in the net measurements.

Veľká and Malá Tŕňa are the centre of tokaj wine region in Slovakia. They have a long tradition of exquisite tokaj wine-making.There are cellar entrances in tuff hills near both villages in which people store wine in regular temperatures. Each cellar entrance divides into further corridors which end with a cellar. The outcome of the geodetic survey is the creation of documentation used forurban planning in the area, as well as an overview of further growth possibilities of wine cellars.

In the process of the foundation, expansion, modification LGN (free or fixed), based on its convenient measuring it defines coordinatepoints and others parameters of networks. The check of measurings and calculations solves by using convenient matrix relations in thenegation form. Their failure points out the incorrect measurement and calculations in the LGN.