Standardised markup for rectified and referenceable imagery

October 17th, 2018, Published in Articles: PositionIT

The Open Geospatial Consortium (OGC) has approved version 2.1 of the GML in JPEG 2000 (GMLJP2) Encoding Standard, allowing standardised markup for rectified and referenceable imagery. The standard defines how Geography Markup Language (GML) is used within JPEG 2000 images and other gridded coverage data. GML, in this case, can be used to add geospatial content to imagery, such as the geographic coordinates of the image, annotations, or references to features.

With newly added support for referenceable grid coverages, GMLJP2 transitions from an imagery format restricted to rectified map images to a more general format with support for a much wider set of imagery types, including sensor model imagery. Sensor model images are useful because they contain geospatial information that is lost upon processing into rectified map images. Besides being processed into map images, sensor model images may be used, for example, for precision mensuration or to construct 3D models of ground structures.

Simple XML examples using the standard can be found on the OGC GMLJP2 v2.1 schemas page. Full examples, including one closely based on the Community Sensor Model for frame cameras, are also available from Aeroptic.

The open GML in JPEG 2000 (GMLJP2) Encoding Standard is free to download and implement, and includes useful hints and best practice for implementation.

Contact OGC, info@opengeospatial.org

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