Despite the undoubted future potential of location-aware computing, location awareness
also presents inherent future threats, perhaps the most important of which is location privacy …

Spatial data quality has become an issue of increasing concern to researchers and
practitioners in the field of Spatial Information Systems (SIS). Clearly the results of any …

Constraints are important elements of every modelling process, but until now they have
been treated in an ad hoc manner, depending on the specific application domain and the …

Knowing the sources of the imperfections of geographic information plays a significant part
in characterizing its internal quality but also in handling its external quality in the areas of …

The quality of spatial data may vary spatially. If map** (interpretation of orthophotos) is
done during fieldwork, this variation in quality may occur as a result of differences in the …

With the rapid development of the GIS world, spatial data are being increasingly shared,
transformed, used and re-used. The quality of spatial data is put in a high priority because …

Peter van Oosterom GIS-technology Section, Delft University of Technology, Delft, The
Netherlands7. 1 Introduction Constraints are important in every GI modelling process but …

Topographic maps show both physical and artificial entities of the surface of the Earth which
represent distinct features forming the building blocks in map composition. Their portrayal on …

The evaluation of geospatial data quality and trustworthiness presents a major challenge to
geospatial data users when making a dataset selection decision. The research presented …

Citizen-sourced volunteered geographic information (VGI) has emerged as a significant data
source alongside authoritative spatial data produced by governmental agencies and the …