Instrument Configuration Document

This section provides documentation on the content of an Instrument Configuration document. The following examples are extracted from the ASAR ImageMode instance.

Overall structure of the document type

The overall structure of an Instrument Configuration document is show below:

<sml:SensorML
   xmlns:sml="http://www.opengis.net/sensorML/1.0.1" 
   xmlns:swe="http://www.opengis.net/swe/1.0.1"
   xmlns:gml="http://www.opengis.net/gml"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
   xmlns:xlink="http://www.w3.org/1999/xlink"
   version="1.0.1">
   <!-- -->
   <sml:member xlink:role="urn:ogc:def:dictionary:CEOS:documentRoles:v01#instrument_configuration">
      <sml:System gml:id="LOCAL_CONFIG_ID">
         <gml:description ... />
         <sml:identification ... />
         <sml:validTime ... />
         <sml:characteristics xlink:role="urn:ogc:def:role:CEOS:eop:GeometricCharacteristics" ... />
         <sml:capabilities xlink:role="urn:ogc:def:role:CEOS:eop:MeasurementCharacteristics" ... />
         <sml:capabilities xlink:role="urn:ogc:def:role:CEOS:eop:PhysicalCharacteristics" ... /> ?
         <sml:documentation xlink:role="urn:ogc:def:role:OGC:document:datasheet" ... /> ?
         <sml:inputs ... />
         <sml:outputs ... />
         <sml:components ... />
      </sml:System>
   </sml:member>
</sml:SensorML>

The "description" is used, as in the case of an Instrument, to give an overall, human readable, description of the characteritics of the mode.

The "Geometric Characteristics" and "Measurement Characteristics" sections are different in each sentinel and are thus described on separate pages.

All other sections of the document are detailed further in the following paragraphs.

Identification Section

The identification section of an Instrument Configuration is similar to that of an Instrument:

<sml:identification>
   <sml:IdentifierList>
      <sml:identifier name="Configuration UID">
         <sml:Term definition="urn:ogc:def:property:CEOS:eop:InstrumentMode">
            <sml:value>urn:ogc:id:CEOS:instrument:ENVISAT:ASAR:ImageMode:v01</sml:value>
         </sml:Term>
      </sml:identifier>
      <sml:identifier name="Instrument UID">
         <sml:Term definition="urn:ogc:def:property:CEOS:eop:InstrumentID">
            <sml:value>urn:ogc:id:CEOS:instrument:ENVISAT:ASAR:v01</sml:value>
         </sml:Term>
      </sml:identifier>
      <sml:identifier name="Short Name">
         <sml:Term definition="urn:ogc:def:property:OGC:shortName">
            <sml:value>ASAR Image Mode</sml:value>
         </sml:Term>
      </sml:identifier>
   </sml:IdentifierList>
</sml:identification>

• Configuration UID: Used to uniquely identify the mode itself

• Instrument UID: Identifies the Instrument that this mode applies to

• Short Name: Used similarly as in an Instrument Capabilities document, to provide a short name for the mode (for display for instance)

See the Identification Section of the Instrument Capabilities page for more details.

ValidTime Section

This is used to indicate the temporal validity of the document.

<sml:validTime>
   <gml:TimePeriod>
      <gml:beginPosition>2002-03-01T00:00:00Z</gml:beginPosition>
      <gml:endPosition indeterminatePosition="now"/>
   </gml:TimePeriod>
</sml:validTime>

This section is used like in an Instrument Capabilities document, as it gives the temporal validity of the description, and can be used in cases where the Instrument capabilities are altered by an incident taking place while in flight, thus limiting the possibilities of this mode. See the ValidTime Section of an Instrument Capabilities document for more info.

Physical Characteristics Section

This section can be used to specify the maximum power consumption in this particular mode.

<sml:characteristics xlink:role="urn:ogc:def:role:CEOS:eop:PhysicalCharacteristics">
   <swe:DataRecord>
      <gml:name>Physical Characteristics</gml:name>
      <swe:field name="Maximum Power Consumption">
         <swe:Quantity definition="urn:ogc:def:property:CEOS:eop:MaximumPowerConsumption">
            <gml:description>Maximum electrical power consumed by the instrument in this mode</gml:description>
            <swe:uom code="W"/>
            <swe:value>1365</swe:value>
         </swe:Quantity>
      </swe:field>
   </swe:DataRecord>
</sml:characteristics>

See the corresponding section of an Instrument Capabilities document for more details.

-- AlexandreRobin - 05 Apr 2008