Data Collection, Problems, and Quality

* Methods for collecting raw data

• Manually or by instruments and sensors
• Surveys
• Scanners

* Data problems
* Data quality

• Contextual DQ
• Intrinsic DQ
• Accessibility DQ
• Representation DQ

* Data integrity

• Uniformity
• Version
• Completeness check
• Conformity check
• Genealogy check or ‘drill down’

* Data access and integration

• Data integration software