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w słowach kluczowych: georeferencyjna baza danych obiektów topograficznych

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Budowa BDOT z punktu widzenia wykonawców

Buczek A., Lichończak K., Uchański J.

Roczniki Geomatyki

2011

T. 9, z. 6

41-76

Budowę BDOT, w tym w szczególności projekt GBDOT, autorzy postrzegają jako niezwykle wartościowe przedsięwzięcie, dające duże możliwości na przyszłość i doceniają ogrom pracy, jaka została wykonana przez jej twórców i kontynuatorów. Zbudowanie Bazy Danych Obiektów Topograficznych dla całego kraju jest dużym osiągnięciem i powinno stanowić wielką wartość dla większości dziedzin życia społecznego i gospodarczego. Jednak czy tak się stanie, zależy w dużej mierze od decyzji - co dalej z BDOT. Nie można poprzestać na stworzeniu BDOT, bo dotychczasowe wysiłki szybko się zdewaluują. Szczególną uwagę należy zwrócić z jednej strony na odpowiednie przystosowanie bazy dla przyszłych użytkowników, z drugiej na utrzymanie jej aktualności oraz profesjonalne przygotowanie jej obrazowania. W artykule autorzy przedstawili jedynie niektóre poglądy i doświadczenia wykonawców wynikające z procesu budowy BDOT. Obrazowane przykładami spostrzeżenia nie stanowią szczegółowej analizy warunków technicznych pod kątem konieczności ich zmian i uszczegółowień - stanowią jedynie przyczynek do dalszej dyskusji nad przewidywanym kształtem BDOT. Zdaniem autorów - GUGiK jako główny gestor i koordynator budowy BDOT w Polsce, przy udziale geodetów wojewódzkich, powinien z tej analizy skorzystać lub ją kontynuować. Załącznikiem do artykułu jest zbiorcza ankieta zawierająca uśrednione wartości i przykładowe komentarze.

Producing Topographic Objects Data Base (BDOT) is a long and demanding process, it requires participation of different groups of specialists and decision making people, as much as other institutions and stakeholders. In this process three phases should be distinguished: preparation, construction and usage. The role of producers with large experience and high level of knowledge should be broadly understood, not only as a builders but also as advisors, experts and users. BDOT projects are highly ranked in companies, they require specialists participation, constant education, preparation and maintenance of professional technological lines, which generate high costs. Continuity of orders and their relatively high pricing provide an opportunity to cover the expenses for company development and hiring high-level specialists. The authors draw attention to the need to clarify the way of external data acquisition, and cooperation with other institutions in the field of BDOT production. A very important issue is proper usage of large scale data to fill the BDOT. The data should pass a verification test in order to be accepted for further usage. It is necessary to prepare procedures for data transformation to the BDOT model. High scale data shouldn't be copied and shouldn't cause appearance of objects contradictory to the BDOT standards. A big problem is caused by regular changes in technical requirements, and especially by different interpretation of technical requirements, and lack of proper supervision of such changes. For some objects there are no precise rules for processing, internal contradictions in technical requirements appear, and the interpretations of different producers are not supervised, which causes a unacceptable diversity, and hetero genous products are created in relation to the area or scope of realization. Producers don't know precise work delivery procedures, and the applications used for control purposes require constant changes in complementary rules of construction, as well as correction of reporting mechanisms. It seems unnecessary to force the producer to deliver certain mid products, such status makes it impossible to use the newest innovative digital techniques and to verify field updating. Realized orders, named "BDOT updating" require basic analysis of their rules. Present conditions enforce an improvement of objects without any regard to their physical changes, which results in the fact that the cost of such order doesn't really differ from the one which was incurred on the creation and it leads to the situation that the value expected by the client doesn't represent the demanded scope of work. For proper professional supervision, jollowing the model BDOT rules, we appeal to create a team of experts looking after the changes in technical instructions, and technical requirements as much as after subjective interpretations, including documentation. Establishment of such expert group is necessary to assure high quality of end product and to avoid implementation of changes contrary to the BDOT model. The project of Georeferenced Topographic Object Data Base (GBDOT) realized by the Head Office of Geodesy and Cartography gives real chances for creation of high class product on the area of the whole country. However, an important question remains, whether BDOT will play its expected role in different areas of social and economical life. The answer depends on the preparations and assuring the realization of proper mechanisms of its updating as well as preparation of the basis for the needs of future users. Cartographic documentation is the next step of BDOT creation and the duty of geodetic and cartographic service. The analysis was based on opinions of the majority of producers, which enhances its trustworthiness and objectivity. Precise data collected from producers are included in the summary questionnaire attached to the paper. We hope that information and suggestions presented will provide an additional help for the BDOT purposes.