MANAGING UNCERTAINTY IN DIGITAL GEOGRAPHICAL INFORMATION PROOF OF CONCEPT

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Authors
  1. Doucette, M.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Water Mark Industries Inc, Fredericton NB (CAN)
Abstract
The report completed in March 1997, details th eapplication of defined quality indicators to an active geographical dataset. This process involved the identification of a "control dataset", against which the accuracy of the "test dataset" wold be measured. To do the data analysis that is required for the quality measurements, both datasets were transformed to be in the same format. Once the datasets were in the same format, measurements could be taken and calculations made, so as to define the magnitude of the respective quality indicator. Reference points on each of the themes available in the DNC dataset were identified as appropriate, and measurements were made to obtain a finite value for each quality component. As attempt was made to measure each of lineage, positional accuracy, logical consistency, attriute accuracy, attribute completeness, semantic accuracy and temporal accuracy. Once all of the measurements were made and the analysis completed, the information was used to demonstrate the accuracy of the features displayed using the Data Quality Viewer. WaterMark designed, developed and demonstrated application software for the purpose of assisting users in assessing data quality information. The usefulness of the tools was tested by a demonstration using the chosen test dataset (Halifax DNC dataset). TRUNCATED
Keywords
Uncertainty management;Quality visualization;Raster backdrops;Computer programs (DIGEST);Quality management
Report Number
DREV-CR-921 — Contractore Report; Technical Report
Date of publication
31 Mar 1997
Number of Pages
115
DSTKIM No
97-03434
CANDIS No
503592
Format(s):
Hardcopy;Document Image stored on Optical Disk

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