Web Service for Positional Quality Assessment: The WPS Tier

Abstract

ABSTRACT:In the field of spatial data every day we have more and more information available, but we still have little or very little information about the quality of spatial data. We consider that the automation of the spatial data quality assessment is a true need for the geomatic sector, and that automation is possible by means of web processing services (WPS), and the application of specific assessment procedures. In this paper we propose and develop a WPS tier centered on the automation of the positional quality assessment. An experiment using the NSSDA positional accuracy method is presented. The experiment involves the uploading by the client of two datasets (reference and evaluation data). The processing is to determine homologous pairs of points (by distance) and calculate the value of positional accuracy under the NSSDA standard. The process generates a small report that is sent to the client. From our experiment, we reached some conclusions on the advantages and disadvantages of WPSs when applied to the automation of spatial data accuracy assessments.

Influence of Sample Size on Automatic Positional Accuracy Assessment Methods for Urban Areas

“…On the other hand, and following Xavier et al [15], spatial data matching can also be used in data quality assessment approaches, such as inconsistency detection [16,17], positional accuracy [18][19][20][21], completeness [22], and thematic accuracy [23]. In the case of positional accuracy, these same authors propose the development of a web service for quality control, whose key process is a simple matching process [24][25][26]. Overall, it could be said that all the matching mechanisms used in quality assessment approaches share a common characteristic: all of them use objective measures for evaluating the degree of similarity between two GDBs.…”

MatchingLand, geospatial data testbed for the assessment of matching methods

“…One of the subprojects of TerraLib is TerraOGC—a framework for Web-GIS development that has been used in web services research 25 , 26 . Inside TerraOGC there is a data quality processing module (DQEval) which contains most of the code related to this testbed.…”

iCPos: Una herramienta para la elaboración de Informes de Calidad Posicional

“…Desde un punto de vista más parecido a los informes de calidad propuestos en Ariza-López y col. (2019a) se destacan los trabajos de Xavier y col. (2015a y 2015b). En ellos, se realiza una propuesta de creación de un servicio de procesamiento web (WPS) (Open Geospatial Consortium [OGC], 2015) que permite la evaluación de calidad externa usando conjuntos de puntos enlazados para el caso del NSSDA (Xavier et al, 2015a) y para el caso de la Norma UNE 148002 (Asociación Española de Normalización [UNE], 2016) (Xavier et al, 2015b). Como ejemplo mostramos la estructura principal del servicio en la Figura 2.…”