Positional accuracy of Curitiba’s digital orthophoto map

Positional accuracy of Curitiba’s digital orthophoto map
Hamilton Carlos Vendrame Junior1, Maria Cecilia Bonato Brandalize2

1. Universidade Federal do Paraná, Curitiba – Paraná – Brasil (hcvjunior@gmail.com)
2.Universidade Federal do Paraná, Curitiba – Paraná – Brasil (Maria.brandalize@ufpr.br)

Abstract: This work evaluates the positional quality of maps produced by the municipality of Curitiba. The Brazilian Cartographic Accuracy Standard (PEC) was applied in order to evaluate the geometrical quality of the orthophoto maps at scales 1:3.000 e 1:5.000. For this purpose, it was used the prescriptions of Decree No. 89817 of June 20, 1984, which deals with the technical requirements of National Mapping, establishing regulatory instructions for the systematic mapping at Brazilian territory. The study methodology comprehended the: availability of digital orthophoto maps at scales 1:3,000 and 1:5,000; determination of the sample size; establishment of a methodology for the identification, distribution and collection of ground control points; data collection and processing of ground control points coordinates, identification and collection of coordinates of homologous points in the digital orthophoto maps; statistical analysis of the collected coordinates and quality assessment according to the PEC. The initial results of the transformations between coordinate systems resulted unsatisfactory once were found discrepancies between the parameters officially adopted and made available by the Institute of Geography and Statistics and those adopted by the municipality. After investigation of the parameters, the products were finally classified as "A" (optimal geometric quality), according to the PEC

Keywords: urban cartography; mapping standards; geodetic systems.

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