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<title>OGC API - Environmental Data Retrieval Standard</title>
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<h1><strong>OGC API - Environmental Data Retrieval Standard</strong></h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div style="page-break-after: always;"></div>
<table class="tableblock frame-none grid-none stretch">
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<col style="width: 100%;">
</colgroup>
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<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong class="big">Open Geospatial Consortium</strong></p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Submission Date: 2020-11-20</p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Approval Date: <yyyy-mm-dd></p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Publication Date: <yyyy-mm-dd></p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">External identifier of this OGC® document: <a href="http://www.opengis.net/doc/is/ogcapi-edr-1/1.0" class="bare">http://www.opengis.net/doc/is/ogcapi-edr-1/1.0</a></p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Internal reference number of this OGC® document: 19-086r2</p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Version: 0.9</p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Category: OGC® Implementation Specification</p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Editors: Mark Burgoyne, Dave Blodgett, Chuck Heazel, Chris Little </p></td>
</tr>
</tbody>
</table>
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<col style="width: 100%;">
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong class="big">OGC API - Environmental Data Retrieval Standard</strong></p></td>
</tr>
</tbody>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong>Copyright notice</strong></p></td>
</tr>
<tr>
<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Copyright © 2020 Open Geospatial Consortium</p></td>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">To obtain additional rights of use, visit <a href="http://www.opengeospatial.org/legal/" class="bare">http://www.opengeospatial.org/legal/</a></p></td>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong>Warning</strong></p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>This document is not an OGC Standard. This document is distributed for review and comment. This document is subject to change without notice and may not be referred to as an OGC Standard.</p>
</div>
<div class="paragraph">
<p>Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.</p>
</div>
<table class="tableblock frame-all grid-none" style="width: 50%;">
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document type: OGC®ImplementationSpecification</p></td>
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document stage: Draft</p></td>
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document language: English</p></td>
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<div style="page-break-after: always;"></div>
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<p> License Agreement</p>
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</div>
<div style="page-break-after: always;"></div>
<div id="toc" class="toc">
<div id="toctitle" class="title">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_introduction">1. Introduction</a></li>
<li><a href="#_scope">2. Scope</a></li>
<li><a href="#_conformance">3. Conformance</a></li>
<li><a href="#references">4. References</a></li>
<li><a href="#terms_and_definitions">5. Terms and Definitions</a>
<ul class="sectlevel2">
<li><a href="#area-definition">5.1. area</a></li>
<li><a href="#corridor-definition">5.2. corridor</a></li>
<li><a href="#cube-definition">5.3. cube</a></li>
<li><a href="#location-definition">5.4. location</a></li>
<li><a href="#instance-definition">5.5. instance</a></li>
<li><a href="#position-definition">5.6. position</a></li>
<li><a href="#radius-definition">5.7. radius</a></li>
<li><a href="#trajectory-definition">5.8. trajectory</a></li>
</ul>
</li>
<li><a href="#conventions">6. Conventions</a>
<ul class="sectlevel2">
<li><a href="#_identifiers">6.1. Identifiers</a></li>
<li><a href="#_link_relations">6.2. Link relations</a></li>
<li><a href="#media-types-section">6.3. Media Types</a></li>
<li><a href="#_examples">6.4. Examples</a></li>
<li><a href="#_schema">6.5. Schema</a></li>
<li><a href="#_use_of_https">6.6. Use of HTTPS</a></li>
<li><a href="#requirements-class-openapi_3_0-clause">6.7. API definition</a>
<ul class="sectlevel3">
<li><a href="#_general_remarks">6.7.1. General remarks</a></li>
<li><a href="#_role_of_openapi">6.7.2. Role of OpenAPI</a></li>
<li><a href="#_references_to_openapi_components_in_normative_statements">6.7.3. References to OpenAPI components in normative statements</a></li>
<li><a href="#_paths_in_openapi_definitions">6.7.4. Paths in OpenAPI definitions</a></li>
<li><a href="#_reusable_openapi_components">6.7.5. Reusable OpenAPI components</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#overview">7. Overview</a>
<ul class="sectlevel2">
<li><a href="#_general">7.1. General</a></li>
<li><a href="#resource-paths">7.2. Resource Paths</a></li>
</ul>
</li>
<li><a href="#dependencies-overview">8. Dependencies on API-Common Core and Collections</a>
<ul class="sectlevel2">
<li><a href="#rc_core-section">8.1. Overview</a></li>
<li><a href="#api-platform-section">8.2. Platform</a>
<ul class="sectlevel3">
<li><a href="#landing-page">8.2.1. API landing page</a></li>
<li><a href="#api-definition">8.2.2. API definition</a></li>
<li><a href="#conformance-classes">8.2.3. Declaration of conformance classes</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#environmental-resource-section">9. Query, Environmental and Information Resources</a>
<ul class="sectlevel2">
<li><a href="#collections">9.1. <strong>Requirements Class:</strong> Collections</a></li>
<li><a href="#collections-access-section">9.2. Information Resources</a></li>
<li><a href="#query-resources-section">9.3. Query Resources</a>
<ul class="sectlevel3">
<li><a href="#parameters-section">9.3.1. Shared query parameters</a></li>
<li><a href="#rc_position-section">9.3.2. Position query</a></li>
<li><a href="#rc_radius-section">9.3.3. Radius query</a></li>
<li><a href="#rc_area-section">9.3.4. Area query</a></li>
<li><a href="#rc_cube-section">9.3.5. Cube query</a></li>
<li><a href="#rc_trajectory-section">9.3.6. Trajectory query</a></li>
<li><a href="#rc_corridor-section">9.3.7. Corridor query</a></li>
<li><a href="#rc_items-section">9.3.8. Items query</a></li>
<li><a href="#rc_locations-section">9.3.9. Locations query</a></li>
<li><a href="#rc_instances-section">9.3.10. Instances query</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#general-section">10. General Requirements</a>
<ul class="sectlevel2">
<li><a href="#_http_1_1">10.1. HTTP 1.1</a></li>
<li><a href="#http-status-codes">10.2. HTTP Status Codes</a></li>
<li><a href="#web-caching">10.3. Web Caching</a></li>
<li><a href="#cross-origin">10.4. Support for Cross-Origin Requests</a></li>
<li><a href="#asynchronous_queries">10.5. Asynchronous queries</a></li>
<li><a href="#coordinate_reference_system">10.6. Coordinate Reference Systems</a></li>
<li><a href="#rc_encoding-section">10.7. Encodings</a></li>
<li><a href="#_link_headers">10.8. Link Headers</a></li>
<li><a href="#rc_oas30-section">10.9. OpenAPI 3.0</a>
<ul class="sectlevel3">
<li><a href="#_basic_requirements">10.9.1. Basic requirements</a></li>
<li><a href="#_complete_definition">10.9.2. Complete definition</a></li>
<li><a href="#exceptions">10.9.3. Exceptions</a></li>
</ul>
</li>
<li><a href="#security">10.10. Security</a></li>
</ul>
</li>
<li><a href="#requirements">Annex A: Requirements Detail</a>
<ul class="sectlevel2">
<li><a href="#_introduction_2">A.1. Introduction</a></li>
<li><a href="#_requirements_test_class_core">A.2. Requirements Test Class Core</a>
<ul class="sectlevel3">
<li><a href="#rc_core"><strong>Requirements Class:</strong> OGC API-Environmental Data Retrieval Core</a></li>
<li><a href="#req_core_api-common"><strong>Requirement 1: /req/core/api-common</strong> OGC API-Common</a></li>
<li><a href="#req_core_conformance"><strong>Requirement 2: /req/core/conformance</strong> Core conformance classes</a></li>
<li><a href="#req_edr_coords-definition"><strong>Requirement 3: /req/edr/coords-definition</strong> Parameter coords definition</a></li>
<li><a href="#req_edr_coords-response"><strong>Requirement 4: /req/edr/coords-response</strong> Parameter coords response</a></li>
<li><a href="#req_core_rc-datetime-parameter"><strong>Requirement 5: /req/core/datetime-parameter</strong> Datetime parameter</a></li>
<li><a href="#req_edr_parameters-definition"><strong>Requirement 6: /req/edr/parameter-name-definition</strong> Parameter parameter-name definition</a></li>
<li><a href="#req_edr_parameters-response"><strong>Requirement 7: /req/edr/parameter-name-response</strong> Parameter parameter-name response</a></li>
<li><a href="#req_edr_crs-definition"><strong>Requirement 8: /req/edr/crs-definition</strong> Parameter crs definition</a></li>
<li><a href="#req_edr_crs-response"><strong>Requirement 9: /req/edr/crs-response</strong> Parameter crs response</a></li>
<li><a href="#req_edr_f-definition"><strong>Requirement 10: /req/edr/f-definition</strong> Parameter <code>f</code> definition</a></li>
<li><a href="#req_edr_f-response"><strong>Requirement 11: /req/edr/f-response</strong> Parameter <code>f</code> response</a></li>
<li><a href="#req_edr_z-definition"><strong>Requirement 12: /req/edr/z-definition</strong> Parameter z definition</a></li>
<li><a href="#req_edr_z-response"><strong>Requirement 13: /req/edr/z-response</strong> Parameter z response</a></li>
<li><a href="#req_edr_within-definition"><strong>Requirement 14: /req/edr/within-definition</strong> Parameter within definition</a></li>
<li><a href="#req_edr_within-response"><strong>Requirement 15: /req/edr/within-response</strong> Parameter within response</a></li>
<li><a href="#req_edr_within-units-definition"><strong>Requirement 16: /req/edr/within-units-definition</strong> Parameter within-units definition</a></li>
<li><a href="#req_edr_within-units-response"><strong>Requirement 17: /req/edr/within-units-response</strong> Parameter within-units response</a></li>
<li><a href="#req_edr_min-z-definition"><strong>Requirement 18: /req/edr/min-z-definition</strong> Parameter min-z definition</a></li>
<li><a href="#req_edr_min-z-response"><strong>Requirement 19: /req/edr/min-z-response</strong> Parameter min-z response</a></li>
<li><a href="#req_edr_max-z-definition"><strong>Requirement 20: /req/edr/max-z-definition</strong> Parameter max-z definition</a></li>
<li><a href="#req_edr_max-z-response"><strong>Requirement 21: /req/edr/max-z-response</strong> Parameter max-z response</a></li>
<li><a href="#req_edr_resolution-x-definition"><strong>Requirement 22: /req/edr/resolution-x-definition</strong> Parameter resolution-x definition</a></li>
<li><a href="#req_edr_resolution-x-response"><strong>Requirement 23: /req/edr/resolution-x-response</strong> Parameter resolution-x response</a></li>
<li><a href="#req_edr_resolution-y-definition"><strong>Requirement 24: /req/edr/resolution-y-definition</strong> Parameter resolution-y definition</a></li>
<li><a href="#req_edr_resolution-y-response"><strong>Requirement 25: /req/edr/resolution-y-response</strong> Parameter resolution-y response</a></li>
<li><a href="#req_edr_resolution-z-definition"><strong>Requirement 26: /req/edr/resolution-z-definition</strong> Parameter resolution-z definition</a></li>
<li><a href="#req_edr_resolution-z-response"><strong>Requirement 27: /req/edr/resolution-z-response</strong> Parameter resolution-z response</a></li>
<li><a href="#req_edr_corridor-height-definition"><strong>Requirement 28: /req/edr/corridor-height-definition</strong> Parameter corridor-height definition</a></li>
<li><a href="#req_edr_corridor-height-response"><strong>Requirement 29: /req/edr/corridor-height-response</strong> Parameter corridor-height response</a></li>
<li><a href="#req_edr_corridor-width-definition"><strong>Requirement 30: /req/edr/corridor-width-definition</strong> Parameter corridor-width definition</a></li>
<li><a href="#req_edr_corridor-width-response"><strong>Requirement 31: /req/edr/corridor-width-response</strong> Parameter corridor-width response</a></li>
<li><a href="#req_core_http"><strong>Requirement 32: /req/core/http</strong> HTTP</a></li>
<li><a href="#req_core_crs84"><strong>Requirement 33: /req/core/crs84</strong> CRS84</a></li>
</ul>
</li>
<li><a href="#_requirements_test_class_openapi_3_0">A.3. Requirements Test Class OpenAPI 3.0</a>
<ul class="sectlevel3">
<li><a href="#rc_oas30"><strong>Requirements Class:</strong> OpenAPI 3.0</a></li>
<li><a href="#req_oas30_oas-common"><strong>Requirement 34: /req/oas30/oas-common</strong> OpenAPI 3.0 API Common</a></li>
<li><a href="#req_oas30_conformance"><strong>Requirement 35</strong> |<strong>/req/oas30/conformance</strong> OpenAPI 3.0 Conformance</a></li>
<li><a href="#req_oas30_completeness"><strong>Requirement 36: /req/oas30/completeness</strong> OpenAPI 3.0 Completeness</a></li>
<li><a href="#req_oas30_exceptions-codes"><strong>Requirement 37: /req/oas30/exceptions-codes</strong> OpenAPI 3.0 Exception codes</a></li>
<li><a href="#req_oas30_security"><strong>Requirement 38: /req/oas30/security</strong> OpenAPI 3.0 Security</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#ATS">Annex B: Abstract Test Suite (Normative)</a>
<ul class="sectlevel2">
<li><a href="#_introduction_3">B.1. Introduction</a></li>
<li><a href="#_conformance_class_core">B.2. Conformance Class Core</a>
<ul class="sectlevel3">
<li><a href="#_general_tests">B.2.1. General Tests</a></li>
<li><a href="#_landing_page_root">B.2.2. Landing Page {root}/</a></li>
<li><a href="#_api_definition_path_rootapi_link">B.2.3. API Definition Path {root}/api (link)</a></li>
<li><a href="#_conformance_path_rootconformance">B.2.4. Conformance Path {root}/conformance</a></li>
</ul>
</li>
<li><a href="#_conformance_class_collections">B.3. Conformance Class Collections</a>
<ul class="sectlevel3">
<li><a href="#_general_tests_2">B.3.1. General Tests</a></li>
<li><a href="#_environmental_data_collections_rootcollections">B.3.2. Environmental Data Collections {root}/collections</a></li>
<li><a href="#_environmental_data_collection_rootcollectionscollectionid">B.3.3. Environmental Data Collection {root}/collections/{collectionId}</a></li>
<li><a href="#_second_tier_collections_tests">B.3.4. Second Tier Collections Tests</a></li>
</ul>
</li>
<li><a href="#_conformance_class_json">B.4. Conformance Class JSON</a>
<ul class="sectlevel3">
<li><a href="#_json_definition">B.4.1. JSON Definition</a></li>
</ul>
</li>
<li><a href="#_conformance_class_geojson">B.5. Conformance Class GeoJSON</a>
<ul class="sectlevel3">
<li><a href="#_json_definition_2">B.5.1. JSON Definition</a></li>
<li><a href="#_geojson_content">B.5.2. GeoJSON Content</a></li>
</ul>
</li>
<li><a href="#_conformance_class_edr_geojson">B.6. Conformance Class EDR GeoJSON</a>
<ul class="sectlevel3">
<li><a href="#_edr_geojson_definition">B.6.1. EDR GeoJSON Definition</a></li>
<li><a href="#_edr_geojson_content">B.6.2. EDR GeoJSON Content</a></li>
</ul>
</li>
<li><a href="#_conformance_class_coveragejson">B.7. Conformance Class CoverageJSON</a>
<ul class="sectlevel3">
<li><a href="#_coveragejson_definition">B.7.1. CoverageJSON Definition</a></li>
<li><a href="#_coveragejson_content">B.7.2. CoverageJSON Content</a></li>
</ul>
</li>
<li><a href="#_conformance_class_html">B.8. Conformance Class HTML</a>
<ul class="sectlevel3">
<li><a href="#_html_definition">B.8.1. HTML Definition</a></li>
<li><a href="#_html_content">B.8.2. HTML Content</a></li>
</ul>
</li>
<li><a href="#_conformance_class_openapi_3_0">B.9. Conformance Class OpenAPI 3.0</a></li>
<li><a href="#_conformance_class_queries">B.10. Conformance Class Queries</a>
<ul class="sectlevel3">
<li><a href="#_query_pattern_tests">B.10.1. Query Pattern Tests</a></li>
<li><a href="#_collections_and_instances">B.10.2. Collections and Instances</a></li>
<li><a href="#_second_tier_tests">B.10.3. Second Tier Tests</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#_examples_informative">Annex C: Examples (Informative)</a>
<ul class="sectlevel2">
<li><a href="#landing-page-examples">C.1. Example Landing Pages</a></li>
<li><a href="#oas-examples">C.2. API Description Examples</a></li>
<li><a href="#conformance-response-examples">C.3. Conformance Examples</a></li>
<li><a href="#collections-metadata-examples">C.4. Collections Metadata Examples</a></li>
<li><a href="#instance-metadata-examples">C.5. Instance Metadata Examples</a></li>
<li><a href="#location-metadata-examples">C.6. Location Query Metadata Examples</a></li>
</ul>
</li>
<li><a href="#glossary">Annex D: Glossary</a></li>
<li><a href="#_revision_history">Annex E: Revision History</a></li>
<li><a href="#Bibliography">Annex F: Bibliography</a></li>
</ul>
</div>
<div style="page-break-after: always;"></div>
</div>
</div>
<div class="sect1">
<h2 id="_introduction"><a class="anchor" href="#_introduction"></a>1. Introduction</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong class="big">i. Abstract</strong></p>
</div>
<div class="paragraph">
<p>The Environmental Data Retrieval (EDR) Application Programming Interface (API) provides a family of lightweight query interfaces to access Environmental Data resources by requesting data at a <strong>Position</strong>, within an <strong>Area</strong> or along a <strong>Trajectory</strong>. An Environmental Data resource is a collection of spatiotemporal data that can be sampled using the EDR query pattern geometries. These patterns are described in the <a href="#rc_core-section">Requirement Class Core</a> section.</p>
</div>
<div class="paragraph">
<p>EDR API query patterns, such as <a href="#position-defintion">Position</a>, <a href="#area-definition">Area</a>, <a href="#cube-definition">Cube</a>, <a href="#trajectory-definition">Trajectory</a> or <a href="#corridor-definition">Corridor</a>, can be thought of as discrete sampling geometries, conceptually consistent with the feature of interest in the <a href="https://www.ogc.org/standards/sos">Sensor Observation Service (SOS)</a>. A typical EDR data resource is a multidimensional dataset that could be accessed via the <a href="http://www.ogc.org/standards/wcs">Web Coverage Service (WCS)</a>. In contrast to SOS and WCS, EDR implements the technical baseline of the <a href="https://ogcapi.ogc.org/">OGC API</a> family of standards and aims to provide a single set of simple-to-use query patterns. Use cases for EDR range from real or virtual time-series observation retrievals, to sub-setting 4-dimensional data cubes along user-supplied sampling geometries. These query patterns do not attempt to satisfy the full scope of either SOS or WCS, but provide useful building blocks to allow the composition of APIs that satisfy a wide range of geospatial data use cases. By defining a set focused querying patterns (and no requirement to implement all of them), the EDR API should help to simplify the design of systems (as they can be performance tuned for the supported queries) making it easier to build robust and scalable infrastructure.</p>
</div>
<div class="paragraph">
<p>With the OGC API family of standards. the OGC community has extended its suite of standards to include Resource Oriented Architectures and Web Application Programming Interfaces (APIs). These standards are based on a shared foundation, the OGC API-Common standard, which defines the resources and access paths that are supported by all OGC APIs. These are listed in <a href="#common-paths">Table 1</a>. This document extends that foundation to define the Environmental Data Retrieval API.</p>
</div>
<table id="common-paths" class="tableblock frame-all grid-all" style="width: 90%;">
<caption class="title">Table 1. Overview of Resources</caption>
<colgroup>
<col style="width: 22.2222%;">
<col style="width: 22.2222%;">
<col style="width: 11.1111%;">
<col style="width: 44.4445%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top" style="background-color: #FFFFFF;">Resource</th>
<th class="tableblock halign-left valign-top" style="background-color: #FFFFFF;">Path</th>
<th class="tableblock halign-center valign-top" style="background-color: #FFFFFF;">HTTP Method</th>
<th class="tableblock halign-left valign-top" style="background-color: #FFFFFF;">Document Reference</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Landing page</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><code>/</code></p></td>
<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">GET</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><a href="#landing-page">API Landing Page</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">API definition</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><code>/api</code></p></td>
<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">GET</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><a href="#api-definition">API Definition</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Conformance classes</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><code>/conformance</code></p></td>
<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">GET</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><a href="#conformance-classes">Declaration of Conformance Classes</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Collections metadata</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><code>/collections</code></p></td>
<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">GET</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><a href="#rc_collection-section">Collections Metadata</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Collection instance metadata</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><code>/collections/{collection_id}</code></p></td>
<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">GET</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><a href="#collection-definition">Collection Metadata</a></p></td>
</tr>
</tbody>
</table>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
During the development phase, these components use a base URL of <code><a href="https://github.com/opengeospatial/ogcapi-environmental-data-retrieval/master" class="bare">https://github.com/opengeospatial/ogcapi-environmental-data-retrieval/master</a></code>, but eventually they are expected to be available under the base URL <code><a href="http://schemas.opengis.net/ogcapi-edr-1/1.0" class="bare">http://schemas.opengis.net/ogcapi-edr-1/1.0</a></code>.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The resources identified in <a href="#common-paths">Table 1</a> primarily support Discovery operations. Discovery operations allow clients to interrogate the API to determine its capabilities and obtain information (metadata) about a distribution of a resource. This includes the API definition of the server(s) as well as metadata about the resources provided by those servers.</p>
</div>
<div class="paragraph">
<p>This standard extends the <a href="#common-paths">Table 1</a> common query operations by defining simple, coordinate-based, queries which are applicable to many geospatial resource types. Other OGC API standards may define additional query capabilities specific to their resource type. EDR Query operations allow resources or values to be retrieved from the underlying geospatial resource data store. The information returned is based upon the selection criteria (query string) provided by the client.</p>
</div>
<div class="paragraph">
<p><strong class="big">ii. Keywords</strong></p>
</div>
<div class="paragraph">
<p>The following are keywords to be used by search engines and document catalogues.</p>
</div>
<div class="paragraph">
<p>ogcdoc, OGC document, property, geographic information, spatial data, spatial things, dataset, distribution, API, geojson, covJSON, html, OpenAPI, AsyncAPI, REST, Common, position, area, trajectory, corridor, time-series</p>
</div>
<div class="paragraph">
<p><strong class="big">iii. Preface</strong></p>
</div>
<div class="paragraph">
<p><strong>OGC Declaration</strong></p>
</div>
<div class="paragraph">
<p>Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The Open Geospatial Consortium Inc. shall not be held responsible for identifying any or all such patent rights.</p>
</div>
<div class="paragraph">
<p>Recipients of this document are requested to submit, with their comments, notification of any relevant patent claims or other intellectual property rights of which they may be aware that might be infringed by any implementation of the standard set forth in this document, and to provide supporting documentation.</p>
</div>
<div class="paragraph">
<p><strong class="big">iv. Submitting organizations</strong></p>
</div>
<div class="paragraph">
<p>The following organizations submitted this Document to the Open Geospatial Consortium (OGC):</p>
</div>
<div class="ulist">
<ul>
<li>
<p>UK Met Office</p>
</li>
<li>
<p>US Geological Service</p>
</li>
<li>
<p>US National Weather Service</p>
</li>
<li>
<p>Wuhan University</p>
</li>
<li>
<p>Meteorological Service of Canada</p>
</li>
<li>
<p>Finnish Meteorological Institute</p>
</li>
<li>
<p>ESRI</p>
</li>
<li>
<p>NASA</p>
</li>
<li>
<p>Météo-France</p>
</li>
</ul>
</div>
<div class="paragraph">
<p><strong class="big">v. Submitters</strong></p>
</div>
<div class="paragraph">
<p>All questions regarding this submission should be directed to the editors or the submitters:</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong>Name</strong></p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong>Affiliation</strong></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Mark Burgoyne <em>(editor)</em></p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Met Office</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Chris Little <em>(editor)</em></p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Met Office</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Chuck Heazel <em>(editor)</em></p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">HeazelTech LLC</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Dave Blodgett <em>(editor)</em></p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">USGS</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="_scope"><a class="anchor" href="#_scope"></a>2. Scope</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This specification identifies resources, captures compliance classes, and specifies requirements which are applicable to OGC Environmental Data Retrieval APIs.</p>
</div>
<div class="paragraph">
<p>This specification addresses two fundamental operations: discovery and query.</p>
</div>
<div class="paragraph">
<p>Discovery operations allow the API to be interrogated to determine its capabilities and retrieve information (metadata) about a distribution of a resource. This includes the API definition of the server as well as metadata about the Environmental Data resources provided by the server.</p>
</div>
<div class="paragraph">
<p>An Environmental Data resource is a <strong><a href="#collection-definition">collection</a></strong> of spatio-temporal data that can be sampled using OGC-API Environmental Data Retrieval query patterns.</p>
</div>
<div class="paragraph">
<p>Query operations allow other environmental data resources to be sampled from the underlying Environmental Data resource, or data store, based upon EDR query geometry and other selection criteria, defined by this standard and selected by the client.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_conformance"><a class="anchor" href="#_conformance"></a>3. Conformance</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Conformance with this standard shall be checked using the tests specified in <a href="#ATS">Abstract Test Suite (Normative)</a> of this document. The framework, concepts, and methodology for testing, and the criteria to claim conformance are specified in the OGC Compliance Testing Policies and Procedures and the <a href="https://www.ogc.org/compliance">OGC Compliance Testing</a> web site.</p>
</div>
<div class="paragraph">
<p>The one Standardization Target for this standard is <a href="#webapi-definition">Web APIs</a>.</p>
</div>
<div class="paragraph">
<p>OGC API - Common - Core defines an API module intended for re-use by other OGC Web API standards. This OGC API - EDR standard is an extension of OGC API - Common - Core. Conformance to this standard requires demonstrated conformance to the applicable Conformance Classes of OGC API - Common - Core.</p>
</div>
<div class="paragraph">
<p>This standard identifies nine (9) Conformance Classes. The <a href="#ctc-definition">Conformance Classes</a> implemented by an API are advertised through the <code>/conformance</code> path on the landing page. Each Conformance Class is defined by one or more <a href="#requirements-class-definition">Requirements Classes</a>. The test classes in <a href="#requirements">Requirements Detail</a> are organized by Requirements Class. The Requirements Classes define the functional requirements which will be tested through the associated Conformance Class.</p>
</div>