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<title>OGC API-Coverages Users Guide</title>
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<table class="tableblock frame-none grid-none stretch">
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<col style="width: 100%;">
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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: <2020-08-12></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/EG/ogcapi-coverages/1.0" class="bare">http://www.opengis.net/doc/EG/ogcapi-coverages/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: 20-075</p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Version: 0.1</p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Category: OGC® Engineering Guidance</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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<col style="width: 100%;">
</colgroup>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong class="big">OGC API-Coverages Users Guide</strong></p></td>
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<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 © 2019 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>
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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 defines an the OGC Best Practices on the implementation and use of the OGC API-Coverages standards. This document is not an OGC Standard and may not be referred to as an OGC Standard. It is subject to change without notice.</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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</colgroup>
<tbody>
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document type: OGC® Engineering Guidance</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document subtype:</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document stage: Draft</p></td>
</tr>
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<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">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></li>
<li><a href="#_references">2. References</a></li>
<li><a href="#_terms_and_definitions">3. Terms and Definitions</a>
<ul class="sectlevel2">
<li><a href="#_coverage">3.1. Coverage</a></li>
<li><a href="#_regular_grid">3.2. Regular grid</a></li>
<li><a href="#_irregular_grid">3.3. Irregular grid</a></li>
<li><a href="#_displaced_grid">3.4. Displaced grid</a></li>
<li><a href="#_mesh">3.5. Mesh</a></li>
<li><a href="#_partition_of_a_coverage">3.6. Partition [of a coverage]</a></li>
<li><a href="#_sensor_model">3.7. Sensor model</a></li>
<li><a href="#_transformation_grid">3.8. Transformation grid</a></li>
</ul>
</li>
<li><a href="#_conventions">4. Conventions</a>
<ul class="sectlevel2">
<li><a href="#_identifiers">4.1. Identifiers</a></li>
</ul>
</li>
<li><a href="#api-users-guide-section">5. Users Guide</a>
<ul class="sectlevel2">
<li><a href="#api-users-guide-section-1">5.1. Get Data From Point</a>
<ul class="sectlevel3">
<li><a href="#_discussion">5.1.1. Discussion</a></li>
<li><a href="#_return_type">5.1.2. Return Type</a></li>
</ul>
</li>
<li><a href="#using-api-common-section">5.2. Using API-Common</a></li>
<li><a href="#using-metadata-section">5.3. Using Metadata</a></li>
<li><a href="#selecting-pixels-section">5.4. Selecting Pixels</a></li>
<li><a href="#range-types-section">5.5. Range Types</a></li>
<li><a href="#slicing-and-subsetting-section">5.6. Slicing and Subsetting</a></li>
</ul>
</li>
<li><a href="#_revision_history">Annex A: Revision History</a></li>
<li><a href="#Glossary">Annex B: Glossary</a></li>
<li><a href="#Bibliography">Annex C: 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>
<div class="paragraph">
<p>Name Affiliation</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_scope"><a class="anchor" href="#_scope"></a>1. Scope</h2>
<div class="sectionbody">
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<div class="paragraph">
<p>Insert Scope text here. Give the subject of the document and the aspects of that scope covered by the document.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_references"><a class="anchor" href="#_references"></a>2. 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>3. 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>3.1. 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>3.2. 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>3.3. 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>3.4. Displaced grid</h3>
<div class="paragraph">
<p>grid whose direct positions are topologically aligned to a grid, but whose geometric positions can vary arbitrarily</p>
</div>
</div>
<div class="sect2">
<h3 id="_mesh"><a class="anchor" href="#_mesh"></a>3.5. Mesh</h3>
<div class="paragraph">
<p>coverage consisting of a collection of curves, surfaces, or solids, respectively</p>
</div>
</div>
<div class="sect2">
<h3 id="_partition_of_a_coverage"><a class="anchor" href="#_partition_of_a_coverage"></a>3.6. Partition [of a coverage]</h3>
<div class="paragraph">
<p>separately stored coverage acting, by being referenced in the coverage on hand, as one of its components</p>
</div>
</div>
<div class="sect2">
<h3 id="_sensor_model"><a class="anchor" href="#_sensor_model"></a>3.7. Sensor model</h3>
<div class="paragraph">
<p>mathematical model for estimating geolocations from recorded sensor data such as digital imagery</p>
</div>
</div>
<div class="sect2">
<h3 id="_transformation_grid"><a class="anchor" href="#_transformation_grid"></a>3.8. Transformation grid</h3>
<div class="paragraph">
<p>grid whose direct positions are given by some transformation algorithm not further specified in this standard</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_conventions"><a class="anchor" href="#_conventions"></a>4. Conventions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This sections provides details and examples for any conventions used in the document. Examples of conventions are symbols, abbreviations, use of XML schema, or special notes regarding how to read the document.</p>
</div>
<div class="sect2">
<h3 id="_identifiers"><a class="anchor" href="#_identifiers"></a>4.1. Identifiers</h3>
<div class="paragraph">
<p>The normative provisions in this document are denoted by the URI</p>
</div>
<div class="paragraph">
<p><a href="http://www.opengis.net/spec/{standard}/{m.n}" class="bare">http://www.opengis.net/spec/{standard}/{m.n}</a></p>
</div>
<div class="paragraph">
<p>All requirements and conformance tests that appear in this document are denoted by partial URIs which are relative to this base.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="api-users-guide-section"><a class="anchor" href="#api-users-guide-section"></a>5. Users Guide</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Everything up the now has been information about this document and how to use it. Topics related to the implementation of Coverages APIs are included in this section.</p>
</div>
<div class="sect2">
<h3 id="api-users-guide-section-1"><a class="anchor" href="#api-users-guide-section-1"></a>5.1. Get Data From Point</h3>
<div class="sect3">
<h4 id="_discussion"><a class="anchor" href="#_discussion"></a>5.1.1. Discussion</h4>
<div class="paragraph">
<p>Users might want to query a coverage for getting a data value from a
single point. Typical use case is to check the height at given location
from DEM but probably queries with more dimensions "temperature at
location x,y,z at time …" make sense as well.</p>
</div>
<div class="paragraph">
<p>WCS 2.0 defines two possibilities for getting a coverage from a single point.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Use subsets with lower limit = upper limit (trim to a point)</p>
<div class="literalblock">
<div class="content">
<pre>``&SUBSET=Lat(20,20)&SUBSET=Long(30,30)``</pre>
</div>
</div>
</li>
<li>
<p>Use subsets with slice points (slice to a point)</p>
<div class="literalblock">
<div class="content">
<pre>``&SUBSET=Lat(20)&SUBSET=Long(30)``</pre>
</div>
</div>
</li>
</ol>
</div>
<div class="paragraph">
<p>The difference between the trimming and slicing is that trimming does
not alter the dimensionality but slicing removes dimensions. If the
coverage is 2D raster DEM in case 1) the result can be 1 by 1 pixel
sized GeoTIFF. In case 2) the result must use format like GML because
rasters have always 2 dimensions but the result must have zero.</p>
</div>
<div class="paragraph">
<p>Behavior in existing WCS 2.0 implementations vary. GeoServer sends
1x1 sized GeoTIFF with slice type of query but trim to point yields an
error "Empty intersection after subsetting"</p>
</div>
<div class="paragraph">
<p><a href="https://osgeo-org.atlassian.net/browse/GEOS-9553">https://osgeo-org.atlassian.net/browse/GEOS-9553</a>.
MapServer sends 1x1 sized GeoTIFF with trim to point query but it does
not accept slicing query. Because MapServer is limited to send coverages
only as rasters it cannot use for example GML for 0-dimensional
coverages.</p>
</div>
<div class="paragraph">
<p>To my knowledge it is much more common to use WMS GetFeatureInfo for
pixel value queries than WCS. However, GetFeatureInfo does not suit
well for other than 8 bit rasters, and if raster is styled for
visualisation, some servers send the pixel value of the native data but
others the pixel value after styling is applied. Thus GFI is a poor
workaround and users deserve better.</p>
</div>
<div class="paragraph">
<p>I would like to see a recommendation about how to support point
queries in OACov. From the client application side I believe that
slicing together with some very simple format for rangeset would be
convenient.</p>
</div>
<div class="paragraph">
<p>Unfortunately point queries are not as trivial as they may feel. In
the next image query by point 1 that hits a data point should not give
any troubles. Point 2 is also easy and those who think that coverages
are pixels can select the intersected pixel, and folks who prefer points
can take the nearest point. The result is the same.</p>
</div>
<div class="paragraph">
<p>Queries by points 3 and 4 are not as easy. Should the result be an
average of 2 or 4 nearest points, respectively (requires interpolation),
or simply the value of some nearest neigbor? Which nearest? How to
guarantee that different servers give uniform results? There are also
coverages which are certainly not continuos and only query by point 1 is
reasonable.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="data:image/png;base64,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" alt="point_query">
</div>
</div>
</div>
<div class="sect3">
<h4 id="_return_type"><a class="anchor" href="#_return_type"></a>5.1.2. Return Type</h4>
<div class="paragraph">
<p>0D support (slice to point) could return single value range set, which in <code>application/json</code> media-type could be either a number for a single band e.g.</p>
</div>
<div class="listingblock">
<div class="content">
<pre>403.51</pre>
</div>
</div>
<div class="paragraph">
<p>or an object for multiple bands:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>{ "red" : 0.434, "green" : 0.123, "blue" : 0.53 }</pre>
</div>
</div>
<div class="paragraph">
<p>Trim to point could return 1x1 image.</p>
</div>
</div>
</div>
<div class="sect2">
<h3 id="using-api-common-section"><a class="anchor" href="#using-api-common-section"></a>5.2. Using API-Common</h3>
<div class="paragraph">
<p>Provides a description of how API-Common Parts 1 and 2 should be used in a Coverage API. Key issues:</p>
</div>
<div class="paragraph">
<p>1) Collections vs. Coverages
2) Use of bbox and datetime - what is their purpose, what elements are they applied against, what are their limitations.</p>
</div>
</div>
<div class="sect2">
<h3 id="using-metadata-section"><a class="anchor" href="#using-metadata-section"></a>5.3. Using Metadata</h3>
<div class="paragraph">
<p>API-Common provides sets of common metadata along with JSON schema for that metadata. Resource-specific APIs are expected to extend that metadata with information specific to their resource type.</p>
</div>
<div class="paragraph">
<p>In the case of coverages, we should distinquish between discovery metadata and exploitation metadata. Coverage metadata is that metadata used to identify and select a coverage. Exploitation metadata is metadata required to use the coverage. Note that there is some overlap between these categories. The API implementor should have the freedom to draw the line based on how they expect their API to be used.</p>
</div>
<div class="paragraph">
<p>Foot Stomp - metadata has to come from somewhere. If it is not in the coverage, then it cannot be populated in the API.</p>
</div>
</div>
<div class="sect2">
<h3 id="selecting-pixels-section"><a class="anchor" href="#selecting-pixels-section"></a>5.4. Selecting Pixels</h3>
<div class="paragraph">