Przedwyrównawcze wykrywanie błędów grubych w pomiarze środków rzutu dla aerotriangulacji

• Autorzy: Ziobro J.

Warianty tytułu

EN

Pre-adjustment detection of gross errors in GPS measurement for aerial triangulation

• Języki publikacji: PL

Abstrakty

PL

W artykule przedstawiono metodę przedwyrównawczego wykrywania błędów grubych w pomiarze środków rzutu oraz wyniki badań nad skutecznością metody. Metoda opiera się na analizie różnic wyników dwóch niezależnych wyznaczeń: wyniku otrzymanego z wyrównania aerotriangulacji bez uwzględnienia pomiaru środków rzutu i wyniku pomiaru środków rzutu wykonanego podczas nalotu fotogrametrycznego. Metoda została przetestowana na 26 blokach, które opracowano w kraju w ciągu kilku ostatnich lat.

EN

Author presents in the article a method for pre-adjustment detection of gross errors in the measured projection centers. The method is based on analyzing differences of the results of two independent measurements: one obtained from adjustment of aerial triangulation without determining projection center and the second, which considers measurement of projection centers during photogrammetric mission. The technique of measuring projection centers for aerial triangulation with the use of GPS method exists since 1993 and is still improved, as far as precision and reliability is concerned. In standard work real verification of quality of measurement is done only at the stage of adjustment of aerial triangulation. The main aim of adjustment is to obtain the result with the highest probability, and it depends on removing gross errors from calculations. As it can be seen from practice, this condition is difficult to fulfilI; the procedure is time-consuming and not fully efficient. Detection and location of gross errors is difficult due to improper division of GPS measurements into profiles, multiple gross errors, mistakes in GPS measurement, or insufficient reliability level of network. In the proposed method distances between neighboring points of profile are compared, obtained from two independent determinations. In addition, increments of coordinates between neighboring projection centers are also compared. These differences, which prove to be higher than triple mean error, are considered as gross errors. The method has been tested on 26 blocks, which were prepared during last years in Poland. The aim of testing was to verify magnitude and number of gross errors of projection centers, which remain in the network after applying the method. Analysis of non-detected gross errors was done using W. Baarda data snooping method, i.e. the method of standardized residuals. In the test blocks at a, scale of 1 : 13 000 level of detectability of gross errors in the measured projections centers was ca. 6 times mean error of coordinate of projection center, while for 1: 26 000 photographs it was 12 times mean error, respectively. The method enables to detect in one calculation step all mistakes and most of gross errors, which results in decreasing number of adjustment cycles in cases, when many data errors exist.

Słowa kluczowe

PL

wykrywanie błędu; błąd gruby; aerotriangulacja

EN

error detection; gross error; aerotriangulation

• Wydawca: Instytut Geodezji i Kartografii
• Czasopismo: Prace Instytutu Geodezji i Kartografii
• Rocznik: 2006
• Tom: T. 52, z. 110
• Strony: 89--102
• Opis fizyczny: Bibliogr. 17 poz., tab.

Twórcy

autor

Ziobro J.

• Instytut Geodezji i Kartografii

Bibliografia

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