<?xml version="1.0" encoding="UTF-8"?>
<ComputationCapabilities xmlns="https://metadata.pithia.eu/schemas/2.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="https://metadata.pithia.eu/schemas/2.2 https://metadata.pithia.eu/schemas/2.2/pithia.xsd">
<!--
The computation process that produces observed properties from its input data.
Input data may be an acquisition or some other computatation, not listed here yet. TODO: add input
specification
Each newly computed observed property that this computation can produce is defined as its
*capability*.
The list of capabilities is all-inclusive, even though not every computation can engage all
capabilities.
-->
<identifier>
<PITHIA_Identifier>
<localID>ComputationCapabilities_GNSS_Total_Electron_Content_50hz_eSWua</localID>
<namespace>ingv</namespace>
<version>1</version>
<creationDate>2023-02-22T10:40:00Z</creationDate>
<lastModificationDate>2023-05-03T10:40:00Z</lastModificationDate>
</PITHIA_Identifier>
</identifier>
<name>eSWua: Code-derived Total Electron Content (TEC) from 50 Hz GNSS signal samples</name>
<description>
GNSS Total Electron Content (TEC) is computed from the 50 Hz raw signal samples acquired on
two different signal frequencies and expressed in TEC units (TECu). Code-derived slant TEC
(sTEC) are evaluated through the dual-frequency pseudorange observables and provided every
15 seconds (tec0, tec15, tec30, tec45) for each available GNSS satellites link (depending on
the acquisition capabilities of the receiver). sTEC at 1-min resolution is provided as the
average of the previous quantities. The absolute sTEC measurements are corrected from the
satellite-induced biases in the case of GPS, Galileo, Beidou and QZSS satellites. Correction
for the station inter-frequency biases are currently not provided. Vertical values of the
TEC (vTEC) are evaluated from the 1-min sTEC by assuming the Ionospheric Pierce Point at an
altitude of 350 km and by applying a specific mapping function (Mannucci et al., 1993,
https://hdl.handle.net/2014/36277).
</description>
<capabilities>
<processCapability>
<!-- this name is used for internal purposes by the Observation XML file (result
section) to point/link to this specific capability. Do not use any space characters! -->
<name>sTEC</name>
<observedProperty xlink:href="https://metadata.pithia.eu/ontology/2.2/observedProperty/TotalElectronContent_Slant"/> <!--
link to the Observed Property controlled vocabulary -->
<dimensionalityInstance xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityInstance/1DPoints"/>
<dimensionalityTimeline xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityTimeline/1DTimeseries"/>
<units xlink:href="https://metadata.pithia.eu/ontology/2.2/unit/TECu"/>
</processCapability>
<processCapability>
<!-- this name is used for internal purposes by the Observation XML file (result
section) to point/link to this specific capability. Do not use any space characters! -->
<name>vTEC</name>
<observedProperty xlink:href="https://metadata.pithia.eu/ontology/2.2/observedProperty/TotalElectronContent_Vertical"/> <!--
link to the Observed Property controlled vocabulary -->
<dimensionalityInstance xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityInstance/1DPoints"/>
<dimensionalityTimeline xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityTimeline/1DTimeseries"/>
<units xlink:href="https://metadata.pithia.eu/ontology/2.2/unit/TECu"/>
</processCapability>
</capabilities>
<dataLevel xlink:href="https://metadata.pithia.eu/ontology/2.2/dataLevel/L2A"/>
<type xlink:href="https://metadata.pithia.eu/ontology/2.2/computationType/IonosphericActivityIndicator"/>
<version/>
<softwareReference/>
<processingInput/>
<algorithm/>
</ComputationCapabilities>
