TAG QUALITY (GeMM)

This section contains the data about the quality of the dataset. The CEN specifies that when no data exist on the quality of the data then this should be written as No Data available.

The content of this section is based on the ENV 12656 and ENV 12657 proposed European standards. The American CSDGM metadata standard has also been taken into account.

According to the CEN, the quality of geographic information is concerned with the performance of a particular set of data against the nominal ground.

The nominal ground is the view of the real world implied by the specification of the geographic dataset. It forms the ideal geographic dataset to which the actual geographic dataset will be compared for evaluating its quality. It is considered to represent the true value for the content of the geographic dataset.

Geographic datasets can be amalgamations or sub-divisions of other geographic datasets. They can result from amalgamating data from more than one source, and from more than one epoch or they can be divided into subsets constrained by spatial extent, class, attribute or time. Quality information can be associated with any level of a geographic dataset. It can be for whole geographic dataset, for a subset, or for individual items of data. The quality elements that are used to describe the quality of geographic information are applicable to all levels.

The quality of a geographic dataset depends on the intended purpose of the geographic dataset and actual use of the geographic dataset.

A quality element is associated with a geographic dataset and therefore applies to entities, attributes and relationships contained in the data. Process describe the history of the geographic dataset. The quality parameters evaluate the difference between the geographic dataset produced and the nominal ground (that is the perfect geographic dataset that corresponds to the specification).

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