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Przesłanki projektowania aerotriangulacji z fotopunktami niesygnalizowanymi

Ziobro J.

Prace Instytutu Geodezji i Kartografii

2008

T. 54, z. 112

51-76

Przedstawiono zasady projektowania aerotriangulacji bloków z fotopunktami niesygnalizowanymi oraz podano parametry projektowania dla dwóch skal zdjęć lotniczych często stosowanych w kraju. Proces projektowania opisano w aspekcie niezawodności całej sieci, niezawodności poszczególnych grup pomiarów oraz możliwej do uzyskania dokładności niewiadomych i homogeniczności dokładności. Podano sposób projektowania dodatkowej osnowy fotopunktów w przypadkach nierzadko zdarzającego się braku pomiaru środków rzutów dla niektórych szeregów bloku.

Author presented in the article conditions of designing block aerotriangulation with measurement of projection centres and non-signalized control points. The impulse to these studies was given by the results of analysis of 38 blocks elaborated in Poland, which revealed, that contractors applied in designing not entirely precise assumptions. AIso domestic technicai instructions in this field do not determine goals of designing precisely and comprehensively. Publications related to designing of aerotriangulation concern blocks of non-signalized contraI points; hence conclusions on accuracy of results and reIiability of measurements in network cannot be fully applied to blocks with non-signalized control points. The aim of study was to determine assumptions for designing aerotriangulation of rectangIe blocks at scales of 1: 13 000 and 1:26 000, which have been applied in the last period most frequently in our country. In these study the required reliability of measurements was determined, as well as possible accuracy of the results, taking into account precisions of particular groups of measurements achieved in production. Investigations were carried out comparing results of different variants of aerotriangulation. These variants were created through simuIation of measurements and simulation of block adjustment. The applied simulation enabled to evaluate variant of aerotriangulation using the following parameters: globaI redundancy of network, locaI redundancy of particular measurements, gIobal redundancy of groups of measurements, mean errors of unknowns, average errors of groups of unknowns. The detailed goaIs and scope of the studies were as follows: - Determination of impact of number of tie points between strips on reliability of particular groups of measurements and accuracy of unknowns and seIection of the best number of ties. Variants of aerotriangulation with number of six-fold tie points from 1 to 6 points were analysed. - Determination of relation between accuracy of the results, reliability of groups of measurements versus distribution and number of ground control points, including selection of the best control network. Six variants of control network were analysed, taking into account accuracy of the results and its homogeneity, as weIl as reliability of measurements. - Preparation of additional control points for compensating partial lack of measurement of projection centres (which happens quite frequently). Impact of lack of measurements was studied for 1 to 4 strips. Author presented in the article conditions for determining the best variant of aerotriangulation, considering reliability of measurements, as well as accuracy and homogeneity of the results. The determined parameters of designing can be a basis for high-quality standard aerotriangulation for these types of blocks.