OGC membership adopts "corrigenda" for GMLCOV and WCS Core standards

The Open Geospatial Consortium (OGC®) has issued official corrigenda for the OGC Web Coverage Service (WCS) Core Service Interface Standard and for OGC GML Coverages (GMLCOV) 1.0.1.A corrigendum is issued to correct known deficiencies or schema errors in an existing OGC standard.

The OGC Geography Markup Language (GML) Encoding Standard is a widely used XML encoding for geospatial data of all types. OGC "coverages", which can be encoded in GML, associate positions within a bounded space to feature attribute values. Examples of these geospatial coverages include Earth images, referenced and non-referenced rasters, curvilinear grids, and point clouds.

Based on OGC Abstract Topic 6 Coverages, which is identical to ISO 19123, GMLCOV provides a unified method for encoding OGC coverages in GML, the OGC Sensor Web Enablement (SWE) Common Standard, and the OGC Web Coverage Service (WCS) Interface Standard. As GMLCOV is independent of a particular service definition, it allows coverage data to be exchanged through different types of services that implement these OGC standards. For all of these coverage types, data can be encoded in a variety of dimensions, including 2-D x/y, 3-D x/y/t and x/y/z, and 4D x/y/z/t data.

The new version, GMLCOV version 1.0.1, provides several corrections, such as for versatile encoding options that include binary formats with or without GML header. To better support this, modularization of the standard has been streamlined.

GMLCOV is free and can be downloaded from https://portal.ogc.org/files/48553.

The OGC Web Coverage Service (WCS) Core Service Interface Standard defines an open standard interface to access multi-dimensional, spatio-temporal coverages, such as satellite imagery, image time series, point clouds, and meshes. The WCS Core, which every software implementation of WCS must implement, allows a client to establish “subsetting” or filter rules for coverage data.

To address issues defined by various stakeholders, the WCS Core corrigendum version improves on the previous version in these ways:

  • The concept of Native Format and Native coordinate reference system (CRS) of a coverage has been clarified.
  • Issues related to delivering different encodings has been increased, including binary files with and without a header based on the OGC Geography Markup Language (GML) Encoding Standard have been corrected.
  • Issues related to support for multi-dimensional, spatio-temporal Coordinate Reference Systems (CRSs) beyond the EPSG codes has been improved.

WCS Core 2.0.1 is free and can be downloaded from https://portal.ogc.org/files/48428.