Uncertainty of calculation the area of parcels

anglais. A cadastre is an official information system that collects subject (ownership) and object (land, buildings) information that represent real world phenomena. Data sets concerning objects are created on the basis of measurement data which are susceptible to uncertainty, which can`t be ignored. The paper presents the results of analysis of the uncertainty of parcel area determination, for which the vertexes coordinates are determined using RTN GNSS measurements and orthophoto. The influence of two factors on the accuracy of parcel area determination was investigated: the elongation factor and the number of vertexes defined on the perimeter of the parcel. On the basis of the studies, it was found that there is a significant impact of the value of the elongation factor on the accuracy of the area determination. In proportion to the increase in the value of this factor, the value of the area determination accuracy decreases. The impact of the number of vertex points on the value of the parcel area accuracy is particularly important for narrow and long parcels. Increase of the number of vertex points results in a significant improvement in the accuracy of parcel area determination.

anglais. spotial data quality, cadastre, GIS

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821-828

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