Large Scaled Topographic Mapping and Issues in Depicting VGI and Open Data

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.

Transitional DEM Merging – A semi-automatic approach for creating contour lines derived from merged DEMs of different sources and quality

“…Calculated contour lines as well as relief shading can be generated error-free in sequence. The method thus allows the use of best available quality elevation models in the production of large scale topographic maps covering border areas.The method presented in this paper is based on the further development of the process described in the article "Large Scaled Topographic Mapping and Issues in Depicting VGI and Open Data" (Hajek et. al.…”

“…The method presented in this paper is based on the further development of the process described in the article "Large Scaled Topographic Mapping and Issues in Depicting VGI and Open Data" (Hajek et. al.…”