SQUAD: A Tool for Spatial Quality and Anomalies Diagnosis – Documentation and Tutorial


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Author(s): Spencer J, Wilkes B

Year: 2017

SQUAD: A Tool for Spatial Quality and Anomalies Diagnosis – Documentation and Tutorial Abstract:

When working with datasets, ensuring the quality of data is always a challenge. The challenge increases with large data sets that contain hundreds or thousands of geographic coordinates. Validating spatial data can quickly become overwhelming, because it is necessary to check the accuracy both of the spatial information (the accuracy and precision of the recorded coordinates) and the attribute information (data associated with that location, such as a location name, address, or associated administrative unit). Both of these domains have to be accurate and they must be in agreement.

When working with large spatial data sets, manually reviewing each record to validate both location and attribute information can be prohibitively time-consuming. A more effective approach would be to look for anomalies in the data that may indicate data quality issues. MEASURE Evaluation’s Spatial Quality Anomalies Diagnosis (SQUAD) Tool can rapidly identify the presence of any of these anomalies, which can then be investigated to determine if there is a data quality issue. Narrowing the focus to records most likely to have an error will greatly reduce the time and effort necessary to identify and resolve errors in a database. This tool may not identify every record that has incorrect information, but it will systematically identify records that should be investigated further to resolve anomalies.

The tool produces a list of which records need to be corrected, and it also gives specific feedback on what may be wrong with the data. If these errors are identified early on, the data set can be corrected and made stronger, more useful, and more trusted.

This manual provides detailed information on using the SQUAD tool. Access additional SQUAD tool resources, including the downloadable tool package, a PowerPoint presentation, and a brief on the SQUAD tool.

This document is not available in print from MEASURE Evaluation.

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