ISO 19118 - Geography

The construction of geographic objects within DDI was done using the US FGDC which is ISO 19118 compliant. The content of the following objects map to these geographic standards:

In SpatialCoverage:

• Bounding Box
• Spatial Object (SpatialPrimative)
• TopLevelReference
• LowestLevelReference
• BoundingPolygon
• Point

In GeographicResponseDomain:

• Datum
• CoordianteSystem
• CoordinateZone
• ErrorCorrection
• Offset
• GeoreferencedObject
• CoordinatePairs
• SpatialPrimitive

The use of these fields provides search information for coordinate based search systems and detailed information needed by the geographer to determine the usefulness of a specific data set for geographic analysis.