The g-rings that describe the Data Set G-Polygon form the outline of the data set.
Comments received during the development of the standards recommended requiring the Bounding Coordinates instead of the more demanding (but more exact) Data Set G-Polygons. To provide a common means of conducting spatial searches on all metadata, Bounding Coordinates were made mandatory. Many users indicated a desire to provide the Data Set G-Polygons to allow the results of spatial searches to be more exact, and so the Data Set G-Polygon elements were added as an option.
Return to: Spatial Domain