Tasking responses for optical missions

OGC 10-135 EO Satellite Tasking Extension for SPS

7.3 Requirements Class: Additional extensions for SAR missions

Requirements Class http:www.opengis.netspecEOSPS2.0reqsar Target Type Server Implementation Dependency http:www.opengis.netspecEOSPS2.0reqcore

7.3.1 Introduction

This section defines additional requirements that shall be fulfilled by all EO SPS server implementations supporting tasking of space-borne EO SAR sensors. Most requirements are also applicable to client implementations supporting tasking of SAR sensors even though no formal conformance testing is defined for clients. Requirement http:www.opengis.netspecEOSPS2.0reqsardependency-core Req 36. An EO SPS implementation passing the “Additional extensions for SAR missions” conformance class shall first pass the core conformance class. Requirement http:www.opengis.netspecEOSPS2.0reqsartasking-params-used Req 37. The EO SPS implementation shall use one of AcquisitionParametersSAR or ValidationParametersSAR class in its DescribeTaskingResponse.

7.3.2 Additional tasking parameters specific to radar SAR missions

7.3.2.1 AcquisitionParametersSAR Class

7.3.2.1.1 Description

This group of parameters is used to specify the acquisition options of a SAR instrument in terms of desired resolution, acquisition and polarization modes, etc.

7.3.2.1.2 Data model

The AcquisitionParametersSAR class is derived from the abstract class AcquisitionParameters defined in the core of this standard. 72 Copyright © 2011 Open Geospatial Consortium EO Satellite Tasking Extension for SPS OGC 10-135 «DataType» Core Tasking Parameters:: AcquisitionParameters «DataType» AcquisitionParametersSAR «property» + GroundResolution: RealPair [0..1] + InstrumentMode: ScopedName [0..1] + FusionAccepted: Boolean [0..1] + PolarizationMode: ScopedName [0..1] Figure 20 – UML diagram of the AcquisitionParametersSAR class

7.3.2.1.3 SWE Common encoding

The following table and XML snippet describe how this tasking parameters group shall be encoded using the SWE Common Data Model: Field Name Definition Component AcquisitionParameters http:www.opengis.netdefpropertyOGC-EO0sarAcquisitionParametersSAR DataRecord GroundResolution http:www.opengis.netdefpropertyOGC-EO0GroundResolution QuantityRange InstrumentMode http:www.opengis.netdefpropertyOGC-EO0InstrumentMode No default code space is defined by this specification for SAR instruments since there does not seem to be a standard for naming SAR acquisition modes. A URL linking to the definitions of each listed mode shall thus be provided by each SAR implementation of EO-SPS. Category FusionAccepted http:www.opengis.netdefpropertyOGC-EO0FusionAccepted Boolean PolarizationMode http:www.opengis.netdefpropertyOGC-EO0sarPolarizationMode A default code space is defined by this specification “ http:www.opengis.netdefpropertyOGC-EO0sarPolarizationModes ” and should be used when applicable Category Name Description Type unit GroundResolution The ground resolution is the distance between two contiguous pixels of remote sensed imagery when projected on the earth. This parameter allows the user to select a range of acceptable ground resolutions. Real Pair meter InstrumentMode A categorical value used to specify a particular instrument configuration. All possible modes should be defined by a code space, usually specific to the instrument in the case of SAR. ScopedName FusionAccepted Specifies if imagery obtained by fusing several images acquired separately and co-registered is acceptable. Boolean PolarizationMode ReceiveTransmit polarization mode of a SAR instrument. ScopedName Copyright © 2011 Open Geospatial Consortium 73