Increasing of the accuracy of vertical angle measurements of geodetic instrumentation

There is a vast number of geodetic angle measurement equipment (like techeometers, theodolites, laser scanners etc.) implemented in the geodesy, civil engineering, construction engineering etc. The accuracy of measurement of mentioned equipment directly influence the quality of buildings, private state measures etc. Though there is a methodology of testing of such equipment officially adopted, such methodology allows determination of solely random errors of measurements at several angular positions of the instrument. The accuracy (random errors and biases) is still unknown for huge part of the angular values generated by the instrument while measurements. In the paper the theoretical assumptions on possible increasing the measurements accuracy by means of precise calibration in a bigger range of possible measurements is described together with some examples of practical solution of the problem.Original Abstract: Egzistuoja daugybe geodeziniu kampu matavimo prietaisu (kaip tacheometrai, teodolitai, lazeriniai skaneriai ir kt.) placiai naudojamq geodezijoje, civileje inzinerijoje, statyboje ir kt. Siu prietaisu matavimo tikslumas tiesiogiai itakoja statybu, zemes sklypu matavimo, stambiu irengimu gamybos tiksluma. Nors oficialiai yra iteisinta tokiu prietaisu patikros metodika, taciau ji uztikrina tik keliu atsitiktinai pasirinktu prietaiso kampiniu rodmenu paklaidu patikrinima. Prietaiso matavimo tikslumas (tiek atsitiktines tiek sistemingosios paklaidos) kitose kampinese padetyse (kuriu prietaisui dirbant generuojamas labai didelis) taip ir lieka nezinomos. Straipsnyje pateikiamos teorines tokiu kampu matavimo prietaisu kalibravimo visame galimu matavimu spektre prielaidos, kartu su kai kuriais galimos naudoti irangos pavyzdziais.