UNE 148002: The New Spanish Standard to Control Positional Quality of Spatial Data
ISBN 978-85-88783-11-9
Authors
1Ariza, F.J.; 2Rodríguez, A.F.; 3Sevilla, C.; 4de Las Cuevas, A.; 5Merino, J.A.
1UNIVERSITY OF JAÉN Email: fjariza@ujaen.es
2CENTRO NACIONAL DE INFORMACIÓN GEOGRÁFICA Email: afrodriguez@fomento.es
3CENTRO NACIONAL DE INFORMACIÓN GEOGRÁFICA Email: cssanchez@fomento.es
4NATIONAL GEOGRAPHIC INSTITUTE SPAIN Email: adelascuevas@fomento.es
5NATIONAL GEOGRAPHIC INSTITUTE SPAIN Email: jamerino@fomento.es
Abstract
The new Spanish UNE 148002 (AENOR, 2014) standard to control positional quality of spatial data is presented. This paper explains the works that have been developed in order to achieve the proposed control method and the main features of the standard. The proposed method is based on the application of the International Standards ISO 2859-1 and ISO 2859-2 to geographic information. This is an innovative idea because positional accuracy has traditionally been controlled by means of the root mean squared error (ASPRS, 1989) or standard deviations (FGDC, 1998), but the application of ISO 2859-1 (ISO 1999) and ISO 2859-2 (ISO 1985) supposes the use of a different metric based on "counting cases". This proposal enables a common framework for dealing with the control of all other spatial data quality components (e.g., completeness, consistency…). This situation is of great interest for users and producers because simplifies the complexity of controlling and reporting about quality allowing the use of the same quality index for all quality elements of spatial data. This approach opens the possibility of using all the other rules of the ISO 2859 family (e.g. sequential sampling plans, skip-lot sampling procedures, assessment of declared quality levels) as well as the methods proposed by MIL-STD-1916 (DoD, 1996) based on "accept-on-cero" sampling plans. A relationship between the parameters "acceptable quality level" and "limiting quality" of the ISO international standards 2859-1 and 2859-2 and the positional accuracy is proposed by means of observed error models. This proposal does not require any assumption for the positional errors (e.g., normality), which means that the application is universal, it can be applied to any type of positional and geometric controls (points, line-strings…), to any dimension (1D, 2D, 3D…) and with parametric or distribution-free error models (e.g. Lidar -Maune 2007). This paper develops two examples of application, the first dealing with a lot by lot control and the second for an isolated control. Other interesting issues of UNE 148002 are the alignments with the international standard ISO 19157 (ISO 2014). In this sense UNE 148002 uses the new data quality unit concept, requiring a clear and explicit definition of the scope, and also includes a proposal of a stand alone quality report for the positional quality evaluation and some guidelines for the use of the metaquality elements of ISO 19157.
Keywords
Standard; Positional Accuracy; Quality Control