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)
Describing the quality of digital geodata in a geodatabase is required for many applications. We present our developments for automated quality control of the German topographic vector data set ATKIS using images. The automation comprises automatic cartographic feature extraction and comparison with ATKIS data, which both are triggered by additional(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 3-or 4-arm road junction or not. The training set was created by a data analysis based feature selection. The best features took part(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)
1. Workshop objectives Core geospatial databases contain geographic information about legal boundaries, buildings, traffic, vegetation etc. which is essential in a large variety of applications. In most countries two-dimensional core geo-spatial databases have been established over the last years, they are maintained by National Mapping Agencies (NMA)(More)
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