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Abstract
Abstract. Open data and geospatial data collected by volunteers are nowadays easy to obtain and available with worldwide coverage through projects like OpenStreetMap. However, the use of these datasets leads to new challenges in depiction especially in the field of large scale topographic cartography. In addition to quality research, new processing and depiction methods for integrating these data are emerging. In the course of this work, specific problems of maps based on OpenStreetMap and Open Data elevation models are pointed out and possible solutions are introduced. In addition, a method for the preprocessing of contour lines is presented and the process flow is described in more detail. The goal of this work is to give insight into a toolbox of specially adapted and (semi-)automated methods. In this way, the quality standard of the depiction of topographic maps based on Open Data is to be increased, but also limitations are being shown.
Highlights
In the course of time, topographic cartography has undergone changes on the technical level as well as on the basis of its representation methodology
Thanks to the crowd-sourcing method of Volunteered Geographic Information (VGI) (Goodchild 2007), large amounts of geodata can be collected in a short time
The project of this work is to increase the display quality of topographic maps based on Open and VGI data
Summary
In the course of time, topographic cartography has undergone changes on the technical level as well as on the basis of its representation methodology. A shift in geodata collection from specialists to laymen and hobby cartographers can be observed (Heipke 2010) This shift leads to uncertainty in data quality. The attractiveness of data bases such as OSM and SRTM for use in topographic cartography is high. The reason for this is the worldwide coverage and their free availability. In the course of this article, problem areas for large-scale topographic cartography when using VGI and Open Geodata will be pointed out, approaches to solutions will be presented and limitations due to the data bases will be identified. This work focuses on an approach to improve contour line representations based on freely available elevation models, which is presented and explained in more detail
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