CIS extension revision enables OGC imagery-related standards to more concisely represent remotely-sensed imagery

1 February2021: The Open Geospatial Consortium (OGC) seeks public comment on version 1.1 of the OGC Coverage Implementation Schema (CIS) - ReferenceableGridCoverage Extension. Comments are due by March 3, 2021.

The CIS ReferenceableGridCoverage Extension extends CIS (a supporting standard of the Web Coverage Service Standard) to provide a set of referenceable grid elements to enable an accurate determination of pixel locations in observed imagery. The Extension accomplishes this, in part, by allowing connections to OGC SensorML 2.0+ sensor models from OGC CIS 1.0+ coverages.

Version 1.1 of this standard permits use of the more concise array encoding of sensor model parameters in SensorML 2.1 documents via the new element setEncodedValues, enabling more compact sensor model descriptions.

A referenceable grid enables the location of all points in a simple grid (such as a set of pixels in an image) to be determined in a Coordinate Reference System (CRS), by providing a means to specify additional geometrical information such as a sensor model. A sensor model may describe, for example, the collection of light rays by an Earth Observation (EO) imagery sensor consisting of a rectangular array of light sensing pixels. 

The extension enables OGC imagery standards based on CIS 1.0+ (such as GMLJP2 2.1) to be able to contain sensor models described with OGC SensorML 2.0+. SensorML 2.0+ can be used to describe and share a wide range of sensor models, for example imaging systems located on satellite and airborne platforms. A simple example of such a description would be the location of a camera, the direction in which it is pointing, as well as details of the camera’s imaging system, such as the number of pixels, the principal point offset, the focal length, and the optical distortion parameters. This data is thus available for mapping every imaged pixel to a location in an external CRS.

The candidate OGC Coverage Implementation Schema - ReferenceableGridCoverage Extension v1.1 is available for review and comment on the OGC Portal. Comments are due by March 3, 2021, and should be submitted via the method outlined on the OGC Coverage Implementation Schema - ReferenceableGridCoverage Extension v1.1 public comment request page.

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