fgdc data quality

[stansmith907]

In addition to lineage, FGDC has a data quality section not represented in mdJson/mdTranslator. The mdJson/mdTranslator schema is primarily based on the ISO 19115-1 object model which moved data quality out of the standard and into ISO 19157 and did some rework during that same time period. The ISO 19139 standard had a data quality section which was enhanced in ISO 19115-2 extension to look more like ISO 19157 before being removed entirely from the ISO 19115 family.

Note that although the 19157 standard was separated from 19115 the ISO 19115-3 implementation allows the 19157 object to be embedded inline similar to how data dictionary is handled in 19110. So, the metadata record is still a single record. I have loaded the XSDs and can derive the ISO 19157 standard from these using XMLSpy.

All of the FGDC elements for data quality elements ( with possible exception of cloud cover ) transfer to ISO 19157.

Cloud is not available in ISO 19115-2.

Do we:

• [ ] implement ISO 19157
• [ ] add the FGDC data quality elements to mdJson/mdTranslator with no output to ISO formats
• [ ] ignore data quality metadata

[dwalt]

I think the various DQ elements in FGDC can be implemented in ISO using lineage/process steps. Utilizing profiles can define classes of lineage and relevant requirements for various data types.

On Mon, Sep 25, 2017 at 12:20 PM, stansmith907 notifications@github.com wrote:

FGDC has a data quality section not represented in mdJson/mdTranslator. The mdJson/mdTranslator implementations are primarily based on the ISO 19115-1 object model which moved data quality out of the standard and into ISO 19157 which was reworked during that same time period. The ISO 19139 standard had a data quality section which was enhanced in ISO 19115-2 extension to look more like ISO 19157 before being removed entirely from the ISO 19115 family.

All of the FGDC elements for data quality elements ( with possible exception of cloud cover ) transfer to ISO 19157, although I cannot tell how well since I do not have access to the standard, only a PowerPoint presentation and overview schema.

Logical consistency, completeness report, and cloud cover are not available in ISO 19115-2.

Do we:

• implement ISO 19157
• add the FGDC data quality elements to mdJson/mdTranslator with no output to ISO formats
• ignore data quality metadata

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[stansmith907]

Current status:

• The data quality models are slightly different, but translatable, from ISO 19115-2 to ISO 19115-3.
• The ISO 19157 is integrated into both the ISO 19115-2/3 XSD and standard. Although the 19157 standard is published separately, it is integrated much as 19110 is in -3.
• Because the 19157 standard is published separately and I don't have the documentation I reverse engineered the object model from the 19115-3 XSD. But what I don't get from that is definitions. I'll ask Tim Kern for assistance in acquiring documentation.