INSPIRE WCTS Coordinate Transformation Service

The INSPIRE WCTS coordinate transformation service is an online service that enables conversion of digital geospatial data between the S-JTSK, S-JTSK/05, ETRS89 and WGS84 coordinate reference systems, including height transformation between the ETRS89 (GRS80), Bpv and WGS 84 systems. The service also enables transformations between the coordinate reference systems defined by the INSPIRE Directive: ETRS89-LAEA, ETRS89-LCC, ETRS89-TM33 and ETRS89-TM34, including height transformation in the EVRS system. Furthermore, the service enables transformations between the WGS 84 / UTM 33, WGS 84 / UTM 34 and WGS 84 / Pseudo-Mercator coordinate reference systems. The service uses the computational module of the ETJTZU 2019 programme, version 2019-10-01, approved by ČÚZK for transformation between ETRS89 and S-JTSK using an improved global transformation applicable to data acquired using GNSS from 1 January 2018 onwards. The mean positional error of transformation between the S-JTSK and ETRS89 (ETRF2000) systems when using the service reaches mp = 0.036 m across the Czech Republic territory. The mean positional error of transformation between the ETRS89 (ETRF2000) and WGS 84 (G873) systems when using the service reaches mp = 0.040 m across the Czech Republic territory. The available operations are listed in the service capabilities (GetCapabilities). The service can be used independently or as part of other services and applications. A client interface for coordinate transformations – the Coordinate Transformation application – is available to users on the ČÚZK Geoportal website. The service complies with the INSPIRE Technical Guidance for Coordinate Transformation Services version 2.1 and simultaneously with the OGC WCTS 0.4.0 standard.