<?xml version="1.0" encoding="UTF-8"?>
<DataCollection 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" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:om="http://www.opengis.net/om/2.0" xsi:schemaLocation="https://metadata.pithia.eu/schemas/2.2 https://metadata.pithia.eu/schemas/2.2/pithia.xsd">
<!--
First report some required elements from ISO standard for Observation
-->
<om:phenomenonTime/><!-- DO NOT USE, we report phenomenon time only in Catalogs -->
<om:resultTime/> <!-- DO NOT USE, we report result time only in Catalogs -->
<om:procedure xlink:href="https://metadata.pithia.eu/resources/2.2/process/noa/CompositeProcess_NOA_Digisonde"/>
<om:observedProperty/>
<om:featureOfInterest>
<FeatureOfInterest>
<namedRegion xlink:href="https://metadata.pithia.eu/ontology/2.2/featureOfInterest/Earth_Ionosphere"/>
</FeatureOfInterest>
</om:featureOfInterest>
<om:result/> <!-- DO NOT USE, we use the CollectionResults below to specify URLs to provider) -->
<!--
Now our Data Collection elements next
-->
<identifier>
<PITHIA_Identifier>
<localID>DataCollection_NOA_Digisonde</localID>
<namespace>noa</namespace>
<version>1</version>
<creationDate>2022-09-04T15:09:00Z</creationDate>
<lastModificationDate>2024-07-22T15:41:00Z</lastModificationDate>
</PITHIA_Identifier>
</identifier>
<name>NOA Athens Digisonde (AT138) Data</name>
<!-- Type is not allowed here. Comes from procedure ? -->
<!-- <type xlink:href="https://metadata.pithia.eu/ontology/2.2/instrumentType/IncoherentScatterRadar"/> -->
<description>
The Ionospheric Group of the National Observatory of Athens operates the Athens Digisonde (URSI code: AT138),
one of the most advanced European real-time ionospheric stations, a Digisonde Portable Sounder – 4D (DPS-4D)
at Penteli site since 2000.
The Athens Digisonde performs 5-minute scheduled observations with vertical incidence ionograms
and ionospheric plasma drifts.
The Athens Digisonde is part of the European Ionosonde Network DIAS (European Digital upper Atmosphere Server)
and part of the Global Network GIRO (Global Ionospheric Radio Observatory), operated by the University of
Massachusetts Lowell. The Athens Digisonde observations support the European Ionospheric Service (EIS) of
the European Space Agency (ESA) Space Weather Service Network.
</description>
<type xlink:href="https://metadata.pithia.eu/ontology/2.2/instrumentType/VerticalSounder"/>
<project xlink:href="https://metadata.pithia.eu/resources/2.2/project/noa/Project_NOA_Digisonde"/>
<relatedParty>
<ResponsiblePartyInfo>
<role xlink:href="https://metadata.pithia.eu/ontology/2.2/relatedPartyRole/PointOfContact"/>
<party xlink:href="https://metadata.pithia.eu/resources/2.2/individual/noa/Individual_NOA_Belehaki"/>
</ResponsiblePartyInfo>
</relatedParty>
<relatedParty>
<ResponsiblePartyInfo>
<role xlink:href="https://metadata.pithia.eu/ontology/2.2/relatedPartyRole/DataProvider"/>
<party xlink:href="https://metadata.pithia.eu/resources/2.2/organisation/pithia/Organisation_NOA"/>
</ResponsiblePartyInfo>
</relatedParty>
<collectionResults>
<source>
<OnlineResource>
<serviceFunction xlink:href="https://metadata.pithia.eu/ontology/2.2/serviceFunction/Download"/>
<linkage><gmd:URL>https://giro.uml.edu/didbase/</gmd:URL></linkage>
<name>DIDBase Ionogram Image Portal</name>
<protocol>HTTPS</protocol>
<description>The DIDBase WebPortal is a landing page for browsing and display of ionogram images. </description>
<dataFormat xlink:href="https://metadata.pithia.eu/ontology/2.2/resultDataFormat/image-png"/>
</OnlineResource>
</source>
<source>
<OnlineResource>
<serviceFunction xlink:href="https://metadata.pithia.eu/ontology/2.2/serviceFunction/Application"/>
<linkage><gmd:URL>https://electron.space.noa.gr/ionostream/api/v2/docs</gmd:URL></linkage>
<name>Ionostream API</name>
<protocol>HTTP</protocol>
<description>
The Ionospheric Group of NOA provides the ionostream API for accessing ionospheric data.
API parameters:
(I) Endpoint /idb/istations: Available stations' products over a given interval.
(II) Endpoint /idb/iproducts: Active stations over a given interval.
(III) Endpoint /idb/idatasets: Ionograms.
Parameter stations: select the station of interest [AT138].
Parameter products: select the products of interest.
(IV) Endpoint /idb/idatasets/pager: Ionograms
Parameter stations: select the station of interest [AT138].
Parameter products: select the products of interest.
By using this endpoint (pager) you divide a large dataset into smaller pages without temporal restrictions.
(V) Endpoint /idb/sao: Selected ionospheric characteristics.
Parameter stations: select the station of interest [AT138].
Parameter characteristics: select the characteristics of interest.
(VI) Endpoint /idb/sao/pager: Selected ionospheric characteristics.
Parameter stations: select the station of interest [AT138].
Parameter characteristics: select the characteristics of interest.
By using this endpoint (pager) you divide a large dataset into smaller pages without temporal restrictions
(VII) Endpoint /idb/sao/rangestats: Selected ionospheric characteristics.
Info on the data temporal availabilty per station [AT138].
Parameter stations: select the station of interest.
(VIII) Endpoint /idb/sao/constats: Selected ionospheric characteristics.
Info on the number of the available data per year/month/day per station over a given interval.
Parameter stations: select the station of interest [AT138].
(IX) Endpoint /idb/saodf: Selected ionospheric characteristics.
Parameter stations: select the station of interest [AT138].
Parameter characteristics: select the characteristics of interest.
Apache Arrow - Pandas DataFrame compatible columnar data structure.
</description>
<dataFormat xlink:href="https://metadata.pithia.eu/ontology/2.2/resultDataFormat/text-sao"/>
<dataFormat xlink:href="https://metadata.pithia.eu/ontology/2.2/resultDataFormat/application-json"/>
</OnlineResource>
</source>
</collectionResults>
<dataLevel xlink:href="https://metadata.pithia.eu/ontology/2.2/dataLevel/L2A"/>
<qualityAssessment>
<dataQualityFlag xlink:href="https://metadata.pithia.eu/ontology/2.2/dataQualityFlag/DQ0"/>
</qualityAssessment>
<permission xlink:href="https://metadata.pithia.eu/ontology/2.2/licence/NOA"/>
</DataCollection>
