OPENSTREETMAP AND OFFICIAL BASE MAP OF CURITIBA – BRAZIL: A STUDY ABOUT COMPLETENESS OF STREETS AND ROADS
ISBN 978-85-88783-11-9
Authors
1Picanco Jr, P.; 2Bravo, J.V.; 3Delazari, L.; 4Robbi, C.
1FEDERAL UNIVERSITY OF PARANA - UFPR Email: pericles.picanco@outlook.com
2FEDERAL UNIVERSITY OF PARANA - UFPR Email: jvmbravo@gmail.com
3FEDERAL UNIVERSITY OF PARANA - UFPR Email: luciene@ufpr.br
4FEDERAL UNIVERSITY OF PARANA - UFPR Email: robbi@ufpr.br
Abstract
This paper aims to compare the update process of the official topographic map of Curitiba and the OpenStreetMap (OSM). These maps are compared based on the meaning of completeness, which is verified in terms of the extension of the streets, and roads that are mapped in both maps. Consequently, we have analyzed some of the results of the access to new technology in the temporal evolution of cartographic updating in the OpenStreeMap platform. The motivation for developing this research is the dissemination of authoritative geoinformation posted by non-cartographers and the need to understand the quality associated with Volunteered Geographic Information (VGI). Therefore, researchers and mapping agencies are investigating the VGI in order to comprehend how VGI systems could provide geoinformation for the official maps. Today, VGI can be an alternative to increase the speed of updating official maps in Brazil. However, it is necessary to investigate the semantic and geometrical compatibility of VGI content and the Brazilian official maps. In this research, we have only considered the urban road system features in the official map of Curitiba city and similar features in the OpenStreetMap of the same region. The official map was produced at a 1:10,000 scale and it is available for any citizen at the city hall website. We verified the numerical difference between the total length of roads in the official map and in the OSM in the years 2013 and 2014 (until October/2014). We identified about 1.82% (around 82.7 km) more features in the 2013 OSM than in the 2013 official map. In 2014, the difference reached 2.91% (around 131.05 km) more features in the OSM. The relative growth of OSM length of roads in 2013 and 2014 (until October) has reached 4.74% (around 213.75 km), while the Curitiba official map has grown only 0.025% (around 1.14km) from 2013 to October 2014. From the analysis of the spatial density of streets and roads, we observed that there are more changes in the suburban areas. In most of large cities in Brazil, a considerable percentage of the low-income population lives in suburban areas. That indicates the use of OSM as a tool for social inclusion by a technological democratization by the internet access. Additionally, we have observed several gaps in the official map, which OpenStreetMap have mapped, such as non-official roads, and irregular occupation of urban land. In general, the foregoing results have indicated the need for further studies on assessing VGI content for several purposes, especially those relative to updating the official maps. This volunteered information could promote social, economic and political development of certain regions where there are not information available, such as in Brazil.
Keywords
VGI; OpenStreetMap; Official map