Felicitas Willrich

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The verification of existing data is an important task in order to ensure a high level of data quality in Geographic Information Systems (GIS). Today this work is carried out mostly manually by an operator, who compares vector data from databases with remotely sensed imagery. In this paper we present a system for automated road data verification using(More)
The paper presents a road junction operator, which was developed for medium resolution black-and-white orthoimages. The operator uses a feed-forward neural network applied for a running window to decide whether it contains a 3or 4arm road junction or not. The training set was created by a data analysis based feature selection. The best features took part in(More)
The quality control and update of geo-data, in this case especially of road-data, is the primary aim of the system, which is presented in the paper. One important task of the system is the automatic extraction of roads from aerial images. Structural knowledge about the scene, provided by existing information from a GIS database, is subdivided into global(More)
Describing the quality of digital geodata in a geodatabase is required for many applications. We present our developments for automated quality control of the area-wide available topographic vector data set ATKIS in Germany using images. To reach an efficient solution our concept is designed as an automated system, which comprises automatic cartographic(More)
An overview of different approaches to establish 2.5D data models for geographic information systems (GIS) and nation-wide spatial data bases will be given. The restriction to 2.5D models is made to provide compatibility with existing 2D GIS data sets and the 2.5D digital terrain models (DTM) available from the national mapping agencies. In particular, an(More)
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