A study on the determination of the maximum error in digitizing cadastral map sheets
Cay, Tayfun & Fatih Iscan
In the last 15-20 years when technology has entered into our lives, as in the other areas of engineering, it has become a necessity to utilize the conveniences and facilities provided by technology also in the area of cartography. Cadastral map sheets which were produced in earlier times need to be digitized in order to be used in the present day digital cadastre and the GIS(Geographic Information System) environment. However, the fact that the error limits which have been defined by the present regulations for digitizing old cadastral map sheets are low makes it difficult to use those map sheets. For this purpose, a regulation draft has been prepared in order to increase the usability of old cadastral map sheets in Turkey. In the present study, 4 cadastral map sheets of Konya/Turkey at a scale of 1/1000 were digitized and compared with land values and the coordinate differences were calculated. These coordinate differences were compared with the point position error limit values which were provided in the present regulation, in the regulation draft and which were obtained from the results of the implementation. It was observed that 48 % of the points in the old cadastral map sheets could be accepted when the error limits( maximum error) defined in the present regulation are taken into consideration, 55 % of the points could be accepted when the error limits defined in the regulation draft are taken into consideration, and 59 % of the points could be accepted according to the error limits obtained as the result of the study implemented. According to these results, it can be seen that error limit values need to be increased. The area values of the map sheets which are composed of the points exceeding the error limit value should be recalculated according to the cadastre law.
Event: XXX FIG Working Week and General Assembly : Strategic Integration of Surveying Services
Only personal, non-commercial use of this document is allowed.