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# Sphinx build info version 1
# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
config: a6656b170d5736361368d2be654357cc
tags: 645f666f9bcd5a90fca523b33c5a78b7
<!DOCTYPE html>
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<title>Downloading &#8212; View Server - User Guide documentation</title>
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<div class="section" id="downloading">
<span id="id1"></span><h1>Downloading<a class="headerlink" href="#downloading" title="Permalink to this headline"></a></h1>
<p>The download interface is implemented following the <a class="reference external" href="https://www.ogc.org/standards/wcs">Web Coverage Service (WCS)</a> as well as the <a class="reference external" href="https://portal.opengeospatial.org/files/?artifact_id=55210">Download Service for Earth
Observation Products Best Practice (DSEO)</a> standards.</p>
<p>These interfaces support both, the simple download of entire products via DSEO
as well as flexible customized downloads via WCS. Both services can be accessed
at the path <code class="docutils literal notranslate"><span class="pre">/ows?</span></code>.</p>
<p>The WCS offers the following customizations in order to optimize downloads and
minimize unnecessarily used bandwidth:</p>
<ul class="simple">
<li><p><a class="reference external" href="http://docs.opengeospatial.org/is/10-140r2/10-140r2.html">Earth Observation Application Profile (EO-WCS)</a></p></li>
<li><p>Meaningful default configuration</p></li>
<li><p>Spatial subset to retrieve only the geographic area of interest</p></li>
<li><p>Range subset to retrieve only the band(s) of interest</p></li>
<li><p>Scaling to required resolution</p></li>
<li><p>Format selection</p></li>
<li><p>Interpolation selection if needed</p></li>
<li><p>Projection selection</p></li>
</ul>
<p>Note that the download size in WCS is restricted in order to not block the
service. Clients are advised to download bigger coverages in chunks and put them
together afterwards.</p>
<div class="section" id="downloading-in-qgis">
<h2>Downloading in QGIS<a class="headerlink" href="#downloading-in-qgis" title="Permalink to this headline"></a></h2>
<p>In order to use the download via WCS 1.0, that QGIS supports, a WCS layer needs to be added.</p>
<p>Open the Data Source Manager and add a WCS Layer, configuring the URL as shown in <a class="reference internal" href="#fig-wcs-qgis1"><span class="std std-numref">Figure 46</span></a> and create a new WCS Connection using the URL of the service and specifying the product id to be downloaded via CQL= query. It is necessary to tick the <strong>Ignore GetCoverage URI reported in capabilities</strong>, as the reference URI usually does not contain the additional CQL or any other request parameters.</p>
<div class="figure align-default" id="id2">
<span id="fig-wcs-qgis1"></span><img alt="QGIS - Create WCS Connection" src="_images/wcs_qgis1.png" />
<p class="caption"><span class="caption-number">Figure 46 </span><span class="caption-text"><em>QGIS - Create WCS Connection</em></span><a class="headerlink" href="#id2" title="Permalink to this image"></a></p>
</div>
<p>A user can be prompted to specify the transformation between coordinate reference systems in case that the default output image is in a different coordinate reference system than current map projection - as shown in <a class="reference internal" href="#fig-wcs-qgis2"><span class="std std-numref">Figure 47</span></a></p>
<div class="figure align-default" id="id3">
<span id="fig-wcs-qgis2"></span><img alt="QGIS - CRS transformation confirmation" src="_images/wcs_qgis2.png" />
<p class="caption"><span class="caption-number">Figure 47 </span><span class="caption-text"><em>QGIS - CRS transformation confirmation</em></span><a class="headerlink" href="#id3" title="Permalink to this image"></a></p>
</div>
<p>Currently, QGIS supports specifying the output coordinate reference system and image format through the relevant input fields as shown in <a class="reference internal" href="#fig-wcs-qgis3"><span class="std std-numref">Figure 48</span></a>. All other optional parameters for WCS request need to be added to the URL manually clicking on Edit button.</p>
<div class="figure align-default" id="id4">
<span id="fig-wcs-qgis3"></span><img alt="QGIS WCS layer options" src="_images/wcs_qgis3.png" />
<p class="caption"><span class="caption-number">Figure 48 </span><span class="caption-text"><em>QGIS WCS layer options</em></span><a class="headerlink" href="#id4" title="Permalink to this image"></a></p>
</div>
<p>The final chapter <a class="reference internal" href="sample-requests.html#sample-requests"><span class="std std-ref">Sample Service Requests</span></a> holds a list of sample requests against
the various services described in this user guide.</p>
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<h1>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline"></a></h1>
<p>This is the User Guide of the View Server (VS). The intended readers are users
of the web client shown below and external services provided by the View Server.</p>
<p>These provided external services are services for searching, viewing, and
downloading of Earth Observation (EO) data. Service endpoints optimized for
performance as well as for flexibility are provided alongside each other.</p>
<div class="figure align-default" id="id1">
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<p class="caption"><span class="caption-number">Figure 1 </span><span class="caption-text"><em>Web Client</em></span><a class="headerlink" href="#id1" title="Permalink to this image"></a></p>
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<p>Continue reading to understand the details of the provided <a class="reference internal" href="web-client.html#web-client"><span class="std std-ref">Web Client</span></a>.</p>
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<span id="id1"></span><h1>Searching<a class="headerlink" href="#searching" title="Permalink to this headline"></a></h1>
<p>The main interface for searching is provided by <a class="reference external" href="http://opensearch.org/">OpenSearch</a> using various extensions including the <a class="reference external" href="https://portal.opengeospatial.org/files/?artifact_id=56866">Geo and Time
Extensions</a>, the
<a class="reference external" href="http://docs.opengeospatial.org/is/13-026r8/13-026r8.html">Extension for Earth Observation</a> as well as the
<a class="reference external" href="http://ceos.org/document_management/Working_Groups/WGISS/Interest_Groups/OpenSearch/CEOS-OPENSEARCH-BP-V1.2.pdf">CEOS OpenSearch Best Practice Document</a>.</p>
<p>The OpenSearch URL endpoints are:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">/opensearch</span></code>: Main service description</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">/opensearch/&lt;format&gt;</span></code>: Search for collections in a specific format</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">/opensearch/collections/&lt;collection-id&gt;</span></code>: Collection specific description</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">/opensearch/collections/&lt;collection-id&gt;/&lt;format&gt;</span></code>: Search for products in
a collection in that format</p></li>
</ul>
<div class="section" id="responses">
<h2>Responses<a class="headerlink" href="#responses" title="Permalink to this headline"></a></h2>
<p>The description related endpoints provide an OpenSearch Description Document
(OSDD). This XML based file format describes general service metadata and
various access URL templates.</p>
<p>These URL objects provide templates that can be filled with parameters to submit
actual metadata queries. Depending on the used URL, the search result is
returned in one of the following formats:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">atom</span></code>: Atom syndication format</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">rss</span></code>: RSS</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">html</span></code>: HTML</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">kml</span></code>: Keyhole Markup Language</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">json</span></code>: GeoJSON</p></li>
</ul>
<p>The resulting items in that result document can be paged. Specific pages can be
retrieved using the <code class="docutils literal notranslate"><span class="pre">offset</span></code> and <code class="docutils literal notranslate"><span class="pre">count</span></code> parameters. Additionally, the
response contains links to the first, last, next, and previous pages of the
result set.</p>
<p>The results of the search depend on the type of object being searched. For the
collection search, the result items are collection descriptions of all matched
collections encoded in the selected format. Each description contains a link to
its own specific OSDD document.</p>
<p>In product searches, the result document items are descriptions of products,
containing links to thumbnails, browses, and product specific services such as
WMS or WCS. Additionally it contains the products acquisition footprint and
time stamp.</p>
</div>
<div class="section" id="filters">
<h2>Filters<a class="headerlink" href="#filters" title="Permalink to this headline"></a></h2>
<p>The URL templates for both the collection and the record search allow to pass
parameters that control the query and shape of the search. The following table
shows all parameters available for both collection and product searches:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 19%" />
<col style="width: 81%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Parameter</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">startIndex</span></code></p></td>
<td><p>The index offset of the items. Used to get subsets of a result
set</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">count</span></code></p></td>
<td><p>The number of records for each page</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">start</span></code></p></td>
<td><p>The start time stamp for the time range</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">end</span></code></p></td>
<td><p>The end time stamp for the time range</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">timerel</span></code></p></td>
<td><p>The semantic of the time range. Either <code class="docutils literal notranslate"><span class="pre">intersects</span></code>,
<code class="docutils literal notranslate"><span class="pre">contains</span></code>, <code class="docutils literal notranslate"><span class="pre">disjoint</span></code>, or <code class="docutils literal notranslate"><span class="pre">equals</span></code></p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">bbox</span></code></p></td>
<td><p>The geographic bounding box expressed as <code class="docutils literal notranslate"><span class="pre">min-lon</span></code>,
<code class="docutils literal notranslate"><span class="pre">min-lat</span></code>, <code class="docutils literal notranslate"><span class="pre">max-lon</span></code>, <code class="docutils literal notranslate"><span class="pre">max-lat</span></code> in WGS84 coordinates</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">geom</span></code></p></td>
<td><p>A WKT encoded geometry for a geographic search</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">lon</span></code></p></td>
<td><p>The longitude component of point/radius searches</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">lat</span></code></p></td>
<td><p>The latitude component of point/radius searches</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">r</span></code></p></td>
<td><p>The radious in metres of point/radius searches</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">georel</span></code></p></td>
<td><p>The semantic of the geometry filter. One of <code class="docutils literal notranslate"><span class="pre">intersects</span></code>,
<code class="docutils literal notranslate"><span class="pre">contains</span></code>, or <code class="docutils literal notranslate"><span class="pre">disjoint</span></code></p></td>
</tr>
</tbody>
</table>
<p>The following parameters are only available in product searches in
addition to the general search parameters:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 19%" />
<col style="width: 81%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Parameter</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">uid</span></code></p></td>
<td><p>Filter on identifier</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">cloudCover</span></code></p></td>
<td><p>Cloud cover filter. Either a specific value or an interval of
values. Values between 0-100</p></td>
</tr>
</tbody>
</table>
<p>The available parameters depend on the configuration made by the operator.</p>
<p>Samples responses for each of the four URL endpoints are provided in the
<a class="reference internal" href="sample-requests.html#samples-searching"><span class="std std-ref">Searching</span></a> section of the <a class="reference internal" href="sample-requests.html#sample-requests"><span class="std std-ref">Sample Service Requests</span></a> chapter.</p>
<p>Continue reading about the provided <a class="reference internal" href="downloading.html#downloading"><span class="std std-ref">Downloading</span></a> services.</p>
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