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<title>OGC API - Coverages - Part 1: Core</title>
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<h1>OGC API - Coverages - Part 1: Core</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: <yyyy-mm-dd></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: 2020-08-10</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-coverages-1/1.0" class="bare">http://www.opengis.net/doc/is/ogcapi-coverages-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: 19-087</p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Version: 0.0.6</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">Editor: Charles Heazel</p></td>
</tr>
</tbody>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong class="big">OGC API - Coverages - Part 1: Core</strong></p></td>
</tr>
</tbody>
</table>
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<colgroup>
<col style="width: 100%;">
</colgroup>
<tbody>
<tr>
<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 © 2019, 2020 Open Geospatial Consortium</p></td>
</tr>
<tr>
<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>
</tr>
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</table>
<table class="tableblock frame-none grid-all stretch">
<colgroup>
<col style="width: 100%;">
</colgroup>
<tbody>
<tr>
<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%;">
<colgroup>
<col style="width: 100%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document type: OGC® Implementation Specification</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document stage: Draft</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document language: English</p></td>
</tr>
</tbody>
</table>
<div style="page-break-after: always;"></div>
<div class="paragraph">
<p> License Agreement</p>
</div>
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<p><span class="small">Permission is hereby granted by the Open Geospatial Consortium, ("Licensor"), free of charge and subject to the terms set forth below, to any person obtaining a copy of this Intellectual Property and any associated documentation, to deal in the Intellectual Property without restriction (except as set forth below), including without limitation the rights to implement, use, copy, modify, merge, publish, distribute, and/or sublicense copies of the Intellectual Property, and to permit persons to whom the Intellectual Property is furnished to do so, provided that all copyright notices on the intellectual property are retained intact and that each person to whom the Intellectual Property is furnished agrees to the terms of this Agreement.</span></p>
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<p><span class="small">If you modify the Intellectual Property, all copies of the modified Intellectual Property must include, in addition to the above copyright notice, a notice that the Intellectual Property includes modifications that have not been approved or adopted by LICENSOR.</span></p>
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<p><span class="small">THIS LICENSE IS A COPYRIGHT LICENSE ONLY, AND DOES NOT CONVEY ANY RIGHTS UNDER ANY PATENTS THAT MAY BE IN FORCE ANYWHERE IN THE WORLD.</span></p>
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<p><span class="small">THE INTELLECTUAL PROPERTY IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE DO NOT WARRANT THAT THE FUNCTIONS CONTAINED IN THE INTELLECTUAL PROPERTY WILL MEET YOUR REQUIREMENTS OR THAT THE OPERATION OF THE INTELLECTUAL PROPERTY WILL BE UNINTERRUPTED OR ERROR FREE. ANY USE OF THE INTELLECTUAL PROPERTY SHALL BE MADE ENTIRELY AT THE USER’S OWN RISK. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR ANY CONTRIBUTOR OF INTELLECTUAL PROPERTY RIGHTS TO THE INTELLECTUAL PROPERTY BE LIABLE FOR ANY CLAIM, OR ANY DIRECT, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM ANY ALLEGED INFRINGEMENT OR ANY LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR UNDER ANY OTHER LEGAL THEORY, ARISING OUT OF OR IN CONNECTION WITH THE IMPLEMENTATION, USE, COMMERCIALIZATION OR PERFORMANCE OF THIS INTELLECTUAL PROPERTY.</span></p>
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<p><span class="small">This license is effective until terminated. You may terminate it at any time by destroying the Intellectual Property together with all copies in any form. The license will also terminate if you fail to comply with any term or condition of this Agreement. Except as provided in the following sentence, no such termination of this license shall require the termination of any third party end-user sublicense to the Intellectual Property which is in force as of the date of notice of such termination. In addition, should the Intellectual Property, or the operation of the Intellectual Property, infringe, or in LICENSOR’s sole opinion be likely to infringe, any patent, copyright, trademark or other right of a third party, you agree that LICENSOR, in its sole discretion, may terminate this license without any compensation or liability to you, your licensees or any other party. You agree upon termination of any kind to destroy or cause to be destroyed the Intellectual Property together with all copies in any form, whether held by you or by any third party.</span></p>
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<p><span class="small">Except as contained in this notice, the name of LICENSOR or of any other holder of a copyright in all or part of the Intellectual Property shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Intellectual Property without prior written authorization of LICENSOR or such copyright holder. LICENSOR is and shall at all times be the sole entity that may authorize you or any third party to use certification marks, trademarks or other special designations to indicate compliance with any LICENSOR standards or specifications. This Agreement is governed by the laws of the Commonwealth of Massachusetts. The application to this Agreement of the United Nations Convention on Contracts for the International Sale of Goods is hereby expressly excluded. In the event any provision of this Agreement shall be deemed unenforceable, void or invalid, such provision shall be modified so as to make it valid and enforceable, and as so modified the entire Agreement shall remain in full force and effect. No decision, action or inaction by LICENSOR shall be construed to be a waiver of any rights or remedies available to it.</span></p>
</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="#_scope">1. Scope</a>
<ul class="sectlevel2">
<li><a href="#_service_scope">1.1. Service Scope</a></li>
<li><a href="#_content_scope">1.2. Content Scope</a></li>
</ul>
</li>
<li><a href="#_conformance">2. Conformance</a></li>
<li><a href="#_references">3. References</a></li>
<li><a href="#_terms_and_definitions">4. Terms and Definitions</a>
<ul class="sectlevel2">
<li><a href="#_coverage">4.1. Coverage</a></li>
<li><a href="#_regular_grid">4.2. Regular grid</a></li>
<li><a href="#_irregular_grid">4.3. Irregular grid</a></li>
<li><a href="#_displaced_grid">4.4. Displaced grid</a></li>
<li><a href="#_mesh">4.5. Mesh</a></li>
<li><a href="#_partition_of_a_coverage">4.6. Partition [of a coverage]</a></li>
<li><a href="#_sensor_model">4.7. Sensor model</a></li>
<li><a href="#_transformation_grid">4.8. Transformation grid</a></li>
</ul>
</li>
<li><a href="#_conventions">5. Conventions</a>
<ul class="sectlevel2">
<li><a href="#_identifiers">5.1. Identifiers</a></li>
<li><a href="#_examples">5.2. Examples</a></li>
<li><a href="#_schema">5.3. Schema</a></li>
<li><a href="#_uml_notation">5.4. UML Notation</a></li>
<li><a href="#_namespace_prefix_conventions">5.5. Namespace Prefix Conventions</a></li>
</ul>
</li>
<li><a href="#overview">6. Overview</a>
<ul class="sectlevel2">
<li><a href="#general-overview">6.1. General</a></li>
<li><a href="#coverage-implementation-schema-overview">6.2. Coverage Implementation Schema</a></li>
<li><a href="#api-behavior-model-overview">6.3. API Behavior Model</a></li>
<li><a href="#dependencies-overview">6.4. Dependencies</a></li>
</ul>
</li>
<li><a href="#_requirements_class_geodata_coverage">7. Requirements Class "GeoData-Coverage"</a>
<ul class="sectlevel2">
<li><a href="#geodata-coverage-overview">7.1. Overview</a></li>
<li><a href="#geodata-coverage-dependencies-section">7.2. Dependencies</a></li>
<li><a href="#api-platform-section">7.3. Platform</a>
<ul class="sectlevel3">
<li><a href="#landing-page">7.3.1. API landing page</a></li>
<li><a href="#api-definition">7.3.2. API definition</a></li>
<li><a href="#conformance-classes">7.3.3. Declaration of conformance classes</a></li>
</ul>
</li>
<li><a href="#collection-access-section">7.4. Collection Access</a>
<ul class="sectlevel3">
<li><a href="#collections">7.4.1. Collections</a></li>
<li><a href="#collectionInfo">7.4.2. Collection Information</a></li>
</ul>
</li>
<li><a href="#coverage-access-section">7.5. Coverage Access</a>
<ul class="sectlevel3">
<li><a href="#coverage-clause">7.5.1. Coverage</a></li>
</ul>
</li>
<li><a href="#parameters-section">7.6. Parameters</a>
<ul class="sectlevel3">
<li><a href="#coverage-domainset-clause">7.6.1. Coverage Domain Set</a></li>
<li><a href="#coverage-rangetype-clause">7.6.2. Coverage Range Type</a></li>
<li><a href="#coverage-rangeset-clause">7.6.3. Coverage Range Set</a></li>
<li><a href="#coverage-metadata-clause">7.6.4. Coverage Metadata</a></li>
<li><a href="#bbox-section">7.6.5. Parameter bbox</a></li>
<li><a href="#datetime--section">7.6.6. Parameter datetime</a></li>
<li><a href="#limit-section">7.6.7. Parameter Limit</a></li>
<li><a href="#_combinations_of_filter_parameters">7.6.8. Combinations of Filter Parameters</a></li>
<li><a href="#_paged_response">7.6.9. Paged Response</a></li>
</ul>
</li>
<li><a href="#general-section">7.7. General</a>
<ul class="sectlevel3">
<li><a href="#http-response">7.7.1. HTTP Response</a></li>
<li><a href="#http-status-codes">7.7.2. HTTP status codes</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#media-types-section">8. Media Types</a>
<ul class="sectlevel2">
<li><a href="#_html_encoding">8.1. HTML Encoding</a></li>
<li><a href="#_cis_json_encoding">8.2. CIS JSON Encoding</a></li>
<li><a href="#_binary">8.3. Binary</a></li>
<li><a href="#_media_types">8.4. Media Types</a></li>
<li><a href="#media-type-defaults">8.5. Default Encodings</a></li>
</ul>
</li>
<li><a href="#_requirements_class_coverage_subset">9. Requirements Class Coverage Subset</a>
<ul class="sectlevel2">
<li><a href="#_subsetting_examples">9.1. Subsetting Examples</a></li>
</ul>
</li>
<li><a href="#requirements-class-html-clause">10. Requirements Class HTML</a>
<ul class="sectlevel2">
<li><a href="#_common">10.1. Common</a></li>
<li><a href="#_coverage_2">10.2. Coverage</a></li>
<li><a href="#_coverage_domain_set">10.3. Coverage Domain Set</a></li>
<li><a href="#_coverage_range_type">10.4. Coverage Range Type</a></li>
<li><a href="#_coverage_range_set">10.5. Coverage Range Set</a></li>
<li><a href="#_coverage_metadata">10.6. Coverage Metadata</a></li>
</ul>
</li>
<li><a href="#requirements-class-cisjson-clause">11. Requirements Class CIS JSON</a>
<ul class="sectlevel2">
<li><a href="#_common_2">11.1. Common</a></li>
<li><a href="#_coverage_3">11.2. Coverage</a></li>
<li><a href="#_coverage_domain_set_2">11.3. Coverage Domain Set</a></li>
<li><a href="#_coverage_range_type_2">11.4. Coverage Range Type</a></li>
<li><a href="#_coverage_range_set_2">11.5. Coverage Range Set</a></li>
<li><a href="#_coverage_metadata_2">11.6. Coverage Metadata</a></li>
</ul>
</li>
<li><a href="#requirements-class-openapi_3_0-clause">12. Requirements class "OpenAPI 3.0"</a></li>
<li><a href="#_conformance_class_abstract_test_suite_normative">Annex A: Conformance Class Abstract Test Suite (Normative)</a>
<ul class="sectlevel2">
<li><a href="#_conformance_class_a">A.1. Conformance Class A</a>
<ul class="sectlevel3">
<li><a href="#_requirement_1">A.1.1. Requirement 1</a></li>
<li><a href="#_requirement_2">A.1.2. Requirement 2</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#_revision_history">Annex B: Revision History</a></li>
<li><a href="#Glossary">Annex C: Glossary</a></li>
<li><a href="#Bibliography">Annex D: Bibliography</a></li>
</ul>
</div>
<div style="page-break-after: always;"></div>
<div class="paragraph">
<p><strong class="big">i. Abstract</strong></p>
</div>
<div class="paragraph">
<p><Insert Abstract Text here></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, <tags separated by commas></p>
</div>
<div class="paragraph">
<p><strong class="big">iii. Preface</strong></p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<div class="paragraph">
<p>Insert Preface Text here. Give OGC specific commentary: describe the technical content, reason for document, history of the document and precursors, and plans for future work. >
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 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>
</td>
</tr>
</table>
</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="paragraph">
<p>Organization name(s)</p>
</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 editor 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-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Name</p></td>
<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Affiliation</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Charles Heazel</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">HeazelTech</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Stephan Meissl <<a href="mailto:[email protected]">[email protected]</a>></p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><a href="https://eox.at">EOX IT Services GmbH</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Tom Kralidis <<a href="mailto:[email protected]">[email protected]</a>></p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Meteorological Service of Canada</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="_scope"><a class="anchor" href="#_scope"></a>1. Scope</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This OGC API Coverages (<a href="https://github.com/opengeospatial/ogc_api_coverages">https://github.com/opengeospatial/ogc_api_coverages</a>) specification establishes how to access coverages as defined by the Coverage Implementation Schema (CIS) 1.1 (<a href="http://docs.opengeospatial.org/is/09-146r6/09-146r6.html">http://docs.opengeospatial.org/is/09-146r6/09-146r6.html</a>) through a Web API such as those described by the OpenAPI specification (<a href="https://www.openapis.org/">https://www.openapis.org/</a>).</p>
</div>
<div class="sect2">
<h3 id="_service_scope"><a class="anchor" href="#_service_scope"></a>1.1. Service Scope</h3>
<div class="paragraph">
<p>The functionality provided by API-Coverages resembles that of the <a href="http://docs.opengeospatial.org/is/17-089r1/17-089r1.html">OGC Web Coverage Service (WCS) 2.1 Interface Standard</a>. It is expected that Coverage APIs and WCS services will be able to interoperate, allowing developers to pick the solution best suited for their requirements.</p>
</div>
<div class="paragraph">
<p>The OGC is using an incremental approach to their API development. The initial goal is to develop a relatively simple API standard which will meet the needs of a large percentage of implementors. Additional capabilities will be added based on community demand.</p>
</div>
<div class="paragraph">
<p>As a result, this API-Coverages standard does not provide a full duplication of the WCS capabilities. The restrictions are:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Only coverage extraction functionality is considered, not general processing (as is provided with Web Coverage Service (WCS) extensions such as the Processing Extension). Exceptions from this rule are subsetting including band subsetting, scaling, and CRS conversion and data format encoding, given their practical relevance.</p>
</li>
<li>
<p>Subsetting is considered in the query component only for now. As typically all dimensions in a coverage are of same importance subsetting might not fit perfectly in the hierarchical nature of the path component. Further, subsetting may reference any axis and leave out any other, which makes positional parameters unsuitable. Nevertheless subsetting in the path component particularly limited to fixed subsets might be considered in a future version.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_content_scope"><a class="anchor" href="#_content_scope"></a>1.2. Content Scope</h3>
<div class="paragraph">
<p>The API-Coverages standard provides access to content which complies with the Coverage Implementation Schema (CIS) 1.1 (<a href="http://docs.opengeospatial.org/is/09-146r6/09-146r6.html">http://docs.opengeospatial.org/is/09-146r6/09-146r6.html</a>). However, there are limitations:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Only gridded or multi-point coverages are addressed, not Curve/Surface/SolidCoverages. The reason is that these are common use cases that receive the most attention today. Gridded coverages or 'point-cloud' multi-point coverages are the primary data types considered but other kinds of datasets are not excluded.</p>
</li>
<li>
<p>Only GeneralGridCoverage is addressed, other coverage types will follow later. Reason is to have a first version early which shows and allows to evaluate the principles.</p>
</li>
<li>
<p>Coverage Partitioning is not supported. The <code>Coverage-Partitioning</code> Requirements Class will be added in a future version.</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_conformance"><a class="anchor" href="#_conformance"></a>2. Conformance</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Conformance with this standard shall be checked using the tests specified in Annex A (normative) 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 OGC Compliance Testing web site.</p>
</div>
<div class="paragraph">
<p>The one Standardization Target for this standard is Web APIs.</p>
</div>
<div class="paragraph">
<p>OGC API-Common provides a common foundation for OGC API standards. Therefore, this standard should be viewed as an extension to API-Common. Conformance to this standard requires demonstrated conformance to the applicable Conformance Classes of API-Common.</p>
</div>
<div class="paragraph">
<p>This standard identifies five Conformance Classes. The Conformance Classes implemented by an API are advertised through the <code>/conformance</code> path on the landing page. Each Conformance Class has an associated Requirements Class. The Requirements Classes define the functional requirements which will be tested through the associated Conformance Class.</p>
</div>
<div class="paragraph">
<p>The Requirements Classes for OGC API-Coverages are:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>Core</strong></p>
</li>
<li>
<p><strong>Subset</strong></p>
</li>
<li>
<p><strong>HTML</strong></p>
</li>
<li>
<p><strong>JSON</strong></p>
</li>
<li>
<p><strong>OpenAPI 3.0</strong></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The <em>Core</em> Requirements Class is the minimal useful service interface for an OGC Coverages API. The requirements specified in this Requirements Class are mandatory for all implementations of API-Coverages.</p>
</div>
<div class="paragraph">
<p>The <em>Subset</em> Requirements Class provides capabilities to select a sub-set of a <code>Coverage</code> using a multi-dimensional "bounding box" which is suitable for any coordinate reference system and any dimension.</p>
</div>
<div class="paragraph">
<p>The <em>HTML</em> and <em>JSON</em> Requirements Classes address support for encodings commonly used with APIs.</p>
</div>
<div class="paragraph">
<p>The <em>OpenAPI 3.0</em> Requirements Class addresses the use of the OpenAPI 3.0 standard to document and communicate the API Definition.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_references"><a class="anchor" href="#_references"></a>3. References</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The following normative documents contain provisions that, through reference in this text, constitute provisions of this document. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the normative document referred to applies.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a id="rfc2616"></a> Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter, L., Leach, P., Berners-Lee, T.: IETF RFC 2616, <strong>HTTP/1.1</strong>, <a href="http://tools.ietf.org/rfc/rfc2616.txt">RFC 2616</a></p>
</li>
<li>
<p><a id="rfc2818"></a> Rescorla, E.: IETF RFC 2818, <strong>HTTP Over TLS</strong>, <a href="http://tools.ietf.org/rfc/rfc2818.txt">RFC 2818</a></p>
</li>
<li>
<p><a id="rfc3339"></a> Klyne, G., Newman, C.: IETF RFC 3339, <strong>Date and Time on the Internet: Timestamps</strong>, <a href="http://tools.ietf.org/rfc/rfc3339.txt">RFC 3339</a></p>
</li>
<li>
<p><a id="rfc3986"></a> Berners-Lee, T., Fielding, R., Masinter, L.: IETF RFC 3986, <strong>Uniform Resource Identifier (URI): Generic Syntax</strong>, <a href="https://tools.ietf.org/html/rfc3986">RFC 3986</a></p>
</li>
<li>
<p><a id="rfc3987"></a> Duerst, M., Suignard, M.: IETF RFC 3987, <strong>Internationalized Resource Identifiers (IRIs)</strong>, <a href="https://tools.ietf.org/html/rfc3987">RFC 3987</a></p>
</li>
<li>
<p><a id="rfc6570"></a> Gregorio, J., Fielding, R., Hadley, M., Nottingham, M., Orchard, D.: IETF RFC 6570, <strong>URI Template</strong>, <a href="https://tools.ietf.org/html/rfc6570">RFC 6570</a></p>
</li>
<li>
<p><a id="rfc8288"></a> Nottingham, M.: IETF RFC 8288, <strong>Web Linking</strong>, <a href="http://tools.ietf.org/rfc/rfc8288.txt">RFC 8288</a></p>
</li>
<li>
<p><a id="OAPI_Common-Core"></a> OGC 19-072: <strong>OGC API - Common - Part 1: Core</strong>, (Draft) <a href="https://github.com/opengeospatial/oapi_common/blob/Master/19-072.pdf">https://github.com/opengeospatial/oapi_common/blob/Master/19-072.pdf</a></p>
</li>
<li>
<p><a id="OAPI_Common-Geodata"></a> OGC 20-024: <strong>OGC API - Common - Part 2: Geospatial Data</strong>, (Draft) <a href="https://github.com/opengeospatial/oapi_common/blob/Master/20-024.pdf">https://github.com/opengeospatial/oapi_common/blob/Master/20-024.pdf</a></p>
</li>
<li>
<p><a id="CIS_1_1"></a> OGC 09-146: <strong>OGC Coverage Implementation Schema (CIS)</strong>, version 1.1, <a href="https://portal.opengeospatial.org/files/?artifact_id=72392&version=2">CIS</a></p>
</li>
<li>
<p><a id="GeoTIFF"></a> OGC 19-008: <strong>OGC GeoTIFF Standard</strong>, Version 1.1, <a href="http://docs.opengeospatial.org/is/19-008r4/19-008r4.html" class="bare">http://docs.opengeospatial.org/is/19-008r4/19-008r4.html</a></p>
</li>
<li>
<p><a id="CIS_JSON_Schema"></a> OGC Schema: <strong>OGC JSON Schema for Coverage Implementation Schema</strong>, version 1.1, 2017, <a href="http://schemas.opengis.net/cis/1.1/json/coverage-schema.json//">CIS Schema</a></p>
</li>
<li>
<p><a id="NETCDF"></a> OGC 10-090: <strong>OGC Network Common Data Form (NetCDF) Core Encoding Standard</strong>, Version 1.0, <a href="http://portal.opengeospatial.org/files/?artifact_id=43732" class="bare">http://portal.opengeospatial.org/files/?artifact_id=43732</a></p>
</li>
<li>
<p><a id="WCS"></a> OGC 17-089: <strong>OGC Web Coverage Service (WCS) Interface Standard - Core</strong>, Version 2.1, <a href="http://docs.opengeospatial.org/is/17-089r1/17-089r1.html">(WCS 2.1)</a></p>
</li>
<li>
<p><a id="OpenAPI"></a> Open API Initiative: <strong>OpenAPI Specification 3.0.2</strong>, <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md">OpenAPI</a></p>
</li>
<li>
<p><a id="schema.org"></a> <strong>Schema.org</strong>: <a href="http://schema.org/docs/schemas.html">Schema.org</a></p>
</li>
<li>
<p><a id="HTML5"></a> W3C: <strong>HTML5</strong>, W3C Recommendation, <a href="http://www.w3.org/TR/html5/">HTML5</a></p>
</li>
<li>
<p>OGC: OGC 07-011, <strong>Abstract Specification Topic 6: The Coverage Type and its Subtypes</strong>, version 7.0 (identical to ISO 19123:2005), 2007</p>
</li>
<li>
<p>OGC: OGC 08-094, <strong>OGC® SWE Common Data Model Encoding Standard</strong>, version 2, 2011</p>
</li>
<li>
<p>OGC: OGC 12-000, <strong>OGC® SensorML: Model and XML Encoding Standard</strong>, version 2, 2014</p>
</li>
<li>
<p>OGC: OGC 09-146r2, <strong>GML 3.2.1 Application Schema – Coverages</strong>, version 1.0.1, 2012</p>
</li>
<li>
<p>OGC: OGC 16-083, <strong>Coverage Implementation Schema – ReferenceableGridCoverage Extension</strong>, version 1, 2017</p>
</li>
<li>
<p>OGC: OGC 09-110r4, <strong>Web Coverage Service (WCS) Core Interface Standard</strong>, version 2, 2012</p>
</li>
<li>
<p>OGC: OGC 13-102r2, <strong>Name type specification – Time and index coordinate reference system definitions</strong> (OGC Policy Document), version 1, 2014</p>
</li>
<li>
<p>IETF: RFC 7159, <strong>The JavaScript Object Notation (JSON) Data Interchange Format</strong>, <a href="https://www.ietf.org/rfc/rfc7159.txt">https://www.ietf.org/rfc/rfc7159.txt</a>, 2014</p>
</li>
<li>
<p>W3C: W3C JSON-LD 1.0, <strong>A JSON-based Serialization for Linked Data</strong>. <a href="http://www.w3.org/TR/json-ld/">http://www.w3.org/TR/json-ld/</a>, 2014</p>
</li>
<li>
<p>W3C: W3C JSON-LD 1.0 <strong>Processing Algorithms and API</strong>. <a href="http://www.w3.org/TR/json-ld-api">http://www.w3.org/TR/json-ld-api</a>, 2014</p>
</li>
<li>
<p>W3C: W3C RDF 1.1 <strong>Concepts and Abstract Syntax.</strong> <a href="https://www.w3.org/TR/2014/REC-rdf11-concepts-20140225/">https://www.w3.org/TR/2014/REC-rdf11-concepts-20140225/</a>, 2014</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_terms_and_definitions"><a class="anchor" href="#_terms_and_definitions"></a>4. Terms and Definitions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This document uses the terms defined in Sub-clause 5 of <a href="https://github.com/opengeospatial/oapi_common/blob/master/19-072.pdf">OGC API - Common - Part 1: Core</a> (OGC 19-072), which is based on the ISO/IEC Directives, Part 2, Rules for the structure and drafting of International Standards. In particular, the word “shall” (not “must”) is the verb form used to indicate a requirement to be strictly followed to conform to this standard.</p>
</div>
<div class="paragraph">
<p>For the purposes of this document, the following additional terms and definitions apply.</p>
</div>
<div class="sect2">
<h3 id="_coverage"><a class="anchor" href="#_coverage"></a>4.1. Coverage</h3>
<div class="paragraph">
<p>feature that acts as a function to return values from its range for any direct position within its spatiotemporal domain, as defined in OGC Abstract Topic 6</p>
</div>
</div>
<div class="sect2">
<h3 id="_regular_grid"><a class="anchor" href="#_regular_grid"></a>4.2. Regular grid</h3>
<div class="paragraph">
<p>grid whose grid lines have a constant distance along each grid axis</p>
</div>
</div>
<div class="sect2">
<h3 id="_irregular_grid"><a class="anchor" href="#_irregular_grid"></a>4.3. Irregular grid</h3>
<div class="paragraph">
<p>Grid whose grid lines have individual distances along each grid axis</p>
</div>
</div>
<div class="sect2">
<h3 id="_displaced_grid"><a class="anchor" href="#_displaced_grid"></a>4.4. Displaced grid</h3>