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A second important aspect of addressed requirements involves feedback from the ISO Standards into the NASA requirements that occurs if the ISO Standards offer improved implementation of shared concepts. In these cases, the community standards used in existing NASA systems might be evolved towards increased compliance with the ISO Standards to take advantage of those capabilities.

Requirements Not Addressed

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Requirements that are identified but not addressed by the ISO Standards are candidates for extensions to the ISO Standards (creation of a NASA Flavor). These requirements need to be evaluated and integrated as extensions into the ISO conceptual models. These models include a standard mechanism for accomplishing this integration. Once the conceptual fit has been determined, an XML representation of the new content must be developed using the ISO encoding rules (ISO 19139).

NASA requirements that are not addressed by current ISO Standards are important candidates for inclusion in revisions of these Standards. Systematic revisions of ISO Standards can occur every five years at the request of a member. ISO 19115, is just finishing the first systematic review and ISO 19115-1, the revision, includes many improvements motivated by NASA and other members of the U.S. Environmental Data Community. The standard for documenting data acquisition and images (ISO 19115-2) will be eligible for revision during 2014. New metadata elements developed as part of the NASA Flavor will be proposed for inclusion in that revision.

Examples

This process is straightforward and many members of the ESDIS Community have extensive relevant experience from fitting together different concepts and data models over many years of interoperability work. Nevertheless, some real-world examples can help clarify the process.

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