Visualisation of Spatial Data Uncertainty. A Case Study of a Database of Topographic Objects

Marek Ślusarski , Magdalena Jurkiewicz

Abstract

The Database of Topographic Objects (DTO) is the official database of Poland for collecting and providing spatial data with the detail level of a topographic map. Polish national DTOs manage information about the spatial location and attribute values of geographic objects. Data in the DTO are the starting point for geographic information systems (GISs) for various central and local governments as well as private institutions. Every set of spatial data based on measurement-derived data is susceptible to uncertainty. Therefore, the widespread awareness of data uncertainty is of vital importance to all GIS users. Cartographic visualisation techniques are an effective approach to informing spatial dataset users about the uncertainty of the data. The objective of the research was to define a set of methods for visualising the DTO data uncertainty using expert know-how and experience. This set contains visualisation techniques for presenting three types of uncertainty: positional, attribute, and temporal. The positional uncertainty for point objects was presented using visual variables, object fill with hue colour and lightness, and glyphs placed at map symbol positions. The positional uncertainty for linear objects was presented using linear object contours made of dotted lines and glyphs at vertices. Fill grain density and contour crispness were employed to represent the positional uncertainty for surface objects. The attribute value uncertainty and the temporal uncertainty were represented using fill grain density and fill colour value. The proposed set of the DTO uncertainty visualisation methods provides a finite array of visualisation techniques that can be tested and juxtaposed. The visualisation methods were comprehensively evaluated in a survey among experts who use spatial databases. Results of user preference analysis have demonstrated that the set of the DTO data uncertainty visualisation techniques may be applied to the full extent. The future implementation of the proposed visualisation methods in GIS databases will help data users interpret values correctly.
Author Marek Ślusarski (FoEEaLS / DoG)
Marek Ślusarski,,
- Department of Geodesy
, Magdalena Jurkiewicz (FoEEaLS / DoG)
Magdalena Jurkiewicz,,
- Department of Geodesy
Journal seriesISPRS International Journal of Geo-Information, ISSN 2220-9964, (N/A 70 pkt)
Issue year2020
Vol9
No1
Pages1-15
Publication size in sheets0.7
Article number16
Keywords in Englishspatial analysis; GIScience; spatial data quality; uncertainty visualisation
ASJC Classification3305 Geography, Planning and Development; 1901 Earth and Planetary Sciences (miscellaneous); 1903 Computers in Earth Sciences
DOIDOI:10.3390/ijgi9010016
URL https://www.mdpi.com/2220-9964/9/1/16/pdf
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); after publication
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Visualisation of Spatial Data Uncertainty. A Case Study of a Database of Topographic Objects of 13-01-2020
2,52 MB
Score (nominal)70
Score sourcejournalList
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.229; WoS Impact Factor: 2018 = 1.84 (2) - 2018=2.022 (5)
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