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166  <div class="section" id="optional-mapserver-support">
167<span id="kernel-mapserver"></span><h1>Optional MapServer support<a class="headerlink" href="#optional-mapserver-support" title="Permalink to this headline"></a></h1>
168<p>Processing geospatial data using WPS Services is usefull. Publishing their results directly as WMS, WFS or WCS ressources is even more convenient. This is possible since <a class="reference external" href="http://zoo-project.org">ZOO-Project 1.3</a> using the <strong>optional MapServer support</strong>. The latter thus allows for automatic publication of WPS Service output as WMS/WFS or WCS using a <a class="reference internal" href="index.html#kernel-index"><span>ZOO-Kernel</span></a> specific internal mechanism which is detailed in this section.</p>
169<div class="admonition note">
170<p class="first admonition-title">Note</p>
171<p class="last"><a class="reference internal" href="../_images/mapserver.png"><img alt="MapServer logo" src="../_images/mapserver.png" style="width: 37.0px; height: 37.0px;" /></a> <a class="reference external" href="http://mapserver.org">MapServer</a> is an open source WMS/WFS/WCS server. Learn more by reading its <a class="reference external" href="http://mapserver.org/documentation.html">documentation</a>.</p>
172</div>
173<div class="section" id="how-does-it-work">
174<h2>How does it work ?<a class="headerlink" href="#how-does-it-work" title="Permalink to this headline"></a></h2>
175<p>If a request with <code class="docutils literal"><span class="pre">mimeType=image/png</span></code> is sent to <a class="reference internal" href="index.html#kernel-index"><span>ZOO-Kernel</span></a>, the latter will detect that the <em>useMapServer</em> option is set to true an it will automatically:</p>
176<blockquote>
177<div><ul class="simple">
178<li>Execute the service using the <em>&lt;Default&gt;</em> block definition (these values must be understood by <a class="reference external" href="http:/gdal.org">GDAL</a>)</li>
179<li>Store the resulting output on disk (in the <code class="docutils literal"><span class="pre">[main]</span></code> &gt; <code class="docutils literal"><span class="pre">dataPath</span></code> directory)</li>
180<li>Write a <a class="reference external" href="http://mapserver.org/mapfile/index.html">mapfile</a> (in the <code class="docutils literal"><span class="pre">[main]</span></code> &gt; <code class="docutils literal"><span class="pre">dataPath</span></code> directory) using the <a class="reference external" href="http://mapserver.org">MapServer</a> C-API (this sets up both WMS and WFS services).</li>
181</ul>
182</div></blockquote>
183<p>Existing WPS Services source code doesn&#8217;t need to be modified once the MapServer support is activated. It only takes to edit their respective <a class="reference internal" href="../services/zcfg-reference.html#services-zcfg"><span>ZOO-Service configuration file</span></a> files accordingly.</p>
184<div class="admonition note">
185<p class="first admonition-title">Note</p>
186<p class="last">In case of a vector data source output, both WMS and WFS configuration are included by default in the resulting mapfile.</p>
187</div>
188<div class="admonition note">
189<p class="first admonition-title">Note</p>
190<p class="last">In case of a raster data source output, both WMS and WCS configuration are included by default in the resulting mapfile.</p>
191</div>
192<p>Depending on the requests, ZOO-Kernel is able to return a location header and different request types:</p>
193<blockquote>
194<div><ul class="simple">
195<li><a class="reference external" href="mailto:ResponseDocument=XXXX&#37;&#52;&#48;asReference=true">ResponseDocument=XXXX<span>&#64;</span>asReference=true</a></li>
196</ul>
197</div></blockquote>
198<p>In this case, ZOO-Kernel will return the GetMap/GetFeature/GetCoverage request as KVP in the <em>href</em> of the result.</p>
199<blockquote>
200<div><ul class="simple">
201<li><a class="reference external" href="mailto:ResponseDocument=XXXX&#37;&#52;&#48;asReference=false">ResponseDocument=XXXX<span>&#64;</span>asReference=false</a></li>
202</ul>
203</div></blockquote>
204<p>In this case, ZOO-Kernel will return the result of the GetMap/GetFeature/GetCoverage request as KVP of the href used in the previous case.</p>
205<blockquote>
206<div><ul class="simple">
207<li><a class="reference external" href="mailto:RawDataOutput=XXXX&#37;&#52;&#48;asReference=true/false">RawDataOutput=XXXX<span>&#64;</span>asReference=true/false</a></li>
208</ul>
209</div></blockquote>
210<p>In this case, ZOO-Kernel will return the GetMap/GetFeature/GetCoverage request as KVP in a specific location header, which implies that the browser is supposed to request MapServer directly.</p>
211<p>Whatever the default output <em>mimeType</em> returned by a WPS service is, it is used if the <em>useMapserver</em> option is found at runtime. As an example, if <code class="docutils literal"><span class="pre">&lt;Default&gt;</span></code> and <code class="docutils literal"><span class="pre">&lt;Supported&gt;</span></code> blocks are found in the ZOO Service configuration file as shown bellow, this means that the service returns GML 3.1.0 features by default.</p>
212<div class="highlight-guess"><div class="highlight"><pre><span class="nt">&lt;Default&gt;</span>
213 mimeType = text/xml
214 encoding = UTF-8
215 schema = http://schemas.opengis.net/gml/3.1.0/base/feature.xsd
216<span class="nt">&lt;/Default&gt;</span>
217<span class="nt">&lt;Supported&gt;</span>
218 mimeType = image/png
219 useMapserver = true
220<span class="nt">&lt;/Supported&gt;</span>
221</pre></div>
222</div>
223</div>
224<div class="section" id="installation-and-configuration">
225<h2>Installation and configuration<a class="headerlink" href="#installation-and-configuration" title="Permalink to this headline"></a></h2>
226<p>Follow the step described bellow in order to activate the ZOO-Project optional MapServer support.</p>
227<div class="section" id="prerequisites">
228<h3>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this headline"></a></h3>
229<blockquote>
230<div><ul class="simple">
231<li>latest <a class="reference external" href="http://zoo-project.org/trac/browser/trunk/zoo-project/zoo-kernel">ZOO-Kernel</a> trunk version</li>
232<li><a class="reference external" href="http://mapserver/org">MapServer</a> version &gt;= 6.0.1</li>
233</ul>
234</div></blockquote>
235<p>First download the lastest zoo-kernel by checking out the svn. Use the following command from do the directory where your previously checked out (in this example we will use <code class="docutils literal"><span class="pre">&lt;PREV_SVN_CO&gt;</span></code> to design this directory).</p>
236<div class="highlight-guess"><div class="highlight"><pre>cd &lt;PREV_SVN_CO&gt;
237svn checkout http://svn.zoo-project.org/svn/trunk/zoo-kernel zoo-kernel-ms
238</pre></div>
239</div>
240<p>Then uncompress the MapServer archive (ie. <code class="docutils literal"><span class="pre">mapserver-6.0.1.tar.bz2</span></code>) into <code class="docutils literal"><span class="pre">/tmp/zoo-ms-src</span></code>, and compile it using the following command:</p>
241<div class="highlight-guess"><div class="highlight"><pre>cd /tmp/zoo-ms-src/mapserver-6.0.1
242./configure --with-ogr=/usr/bin/gdal-config --with-gdal=/usr/bin/gdal-config \
243               --with-proj --with-curl --with-sos --with-wfsclient --with-wmsclient \
244               --with-wcs --with-wfs --with-postgis --with-kml=yes --with-geos \
245               --with-xml --with-xslt --with-threads --with-cairo
246make
247cp mapserv /usr/lib/cgi-bin
248</pre></div>
249</div>
250<p>Once done, compile ZOO-Kernel with MapServer support from the <code class="docutils literal"><span class="pre">&lt;PREV_SVN_CO&gt;</span></code> directory, using the following command:</p>
251<div class="highlight-guess"><div class="highlight"><pre>cd zoo-kernel-ms
252autoconf
253./configure --with-python --with-mapserver=/tmp/zoo-ms-src/mapserver-6.0.1
254make
255</pre></div>
256</div>
257<p>You can then copy the new ZOO-Kernel to <code class="docutils literal"><span class="pre">/usr/lib/cgi-bin</span></code> directory, as follow:</p>
258<div class="highlight-guess"><div class="highlight"><pre>cp zoo_loader.cgi /usr/lib/cgi-bin
259</pre></div>
260</div>
261</div>
262<div class="section" id="main-configuration-file">
263<h3>Main configuration file<a class="headerlink" href="#main-configuration-file" title="Permalink to this headline"></a></h3>
264<p>Open and edit the <code class="docutils literal"><span class="pre">/usr/lib/cgi-bin/main.cfg</span></code> file, by adding the following content in the <code class="docutils literal"><span class="pre">[main]</span></code> section:</p>
265<div class="highlight-guess"><div class="highlight"><pre>dataPath = /var/www/temp/
266mapserverAddress=http://localhost/cgi-bin/mapserv
267</pre></div>
268</div>
269<p>The <code class="docutils literal"><span class="pre">dataPath</span></code> directory is mandatory and must belong to the Apache user.</p>
270<div class="highlight-guess"><div class="highlight"><pre>mkdir /var/www/temp/
271chown -r apache:apache /var/www/temp/
272</pre></div>
273</div>
274<p>A <code class="docutils literal"><span class="pre">symbols.sym</span></code> file is required in this directory. Create it and add the following content in it:</p>
275<div class="highlight-guess"><div class="highlight"><pre>SYMBOLSET
276SYMBOL
277  NAME &quot;circle&quot;
278  TYPE ellipse
279  FILLED true
280  POINTS
281    1 1
282  END
283END
284END
285</pre></div>
286</div>
287<div class="admonition note">
288<p class="first admonition-title">Note</p>
289<p class="last">Only one symbol definition is required (with any name) for the WMS service output.</p>
290</div>
291<p>The ZOO-Project optional MapServer support is activated at this step. Don&#8217;t forget to add the <code class="docutils literal"><span class="pre">mapserverAddress</span></code> and  <code class="docutils literal"><span class="pre">msOgcVersion</span></code> parameters to the <code class="docutils literal"><span class="pre">main.cfg</span></code> file in order to  to specify the path to MapServer and the OGC WebService version used by the Services.</p>
292<div class="admonition warning">
293<p class="first admonition-title">Warning</p>
294<p class="last">ZOO-kernel will segfault (checking <code class="docutils literal"><span class="pre">NULL</span></code> value should correct this behavior) if the <code class="docutils literal"><span class="pre">mapserverAddress</span></code> parameter is not found</p>
295</div>
296</div>
297<div class="section" id="service-configuration-file">
298<h3>Service configuration file<a class="headerlink" href="#service-configuration-file" title="Permalink to this headline"></a></h3>
299<div class="section" id="usemapserver">
300<h4>useMapserver<a class="headerlink" href="#usemapserver" title="Permalink to this headline"></a></h4>
301<p>In order to activate the MapServer WMS/WFS/WCS output for a specific service, the <code class="docutils literal"><span class="pre">useMapserver</span></code> parameter must be added to the <code class="docutils literal"><span class="pre">&lt;Default&gt;</span></code> or <code class="docutils literal"><span class="pre">&lt;Supported&gt;</span></code> blocks of the Service <cite>services-zcfg</cite>. If <code class="docutils literal"><span class="pre">useMapserver=true</span></code>, this means that the output result of the Service is a GDAL compatible datasource and that you want it to be automatically published by MapServer as WMS,WFS or WCS.</p>
302<p>When the useMapserver option is used in a <code class="docutils literal"><span class="pre">&lt;Default&gt;</span></code> or <code class="docutils literal"><span class="pre">&lt;Supported&gt;</span></code> block, then you have to know what are the corresponding mimeType:</p>
303<blockquote>
304<div><ul class="simple">
305<li>text/xml: Implies that the output data will be accessible through a WFS GetFeature request (default protocol version 1.1.0)</li>
306<li>image/tiff: Implies that the output data will be accessible through a WCS GetCoverage request (default protocol version 2.0.0)</li>
307<li>any other mimeType coupled with useMapserver option: Implies that the output data will be accessible through a WMS GetMap request (default protocol version 1.3.0). You can check the supported output mimeType by sending a GetCapabilities request to MapServer.</li>
308</ul>
309</div></blockquote>
310<p>You get the same optional parameter <code class="docutils literal"><span class="pre">msOgcVersion</span></code> as for the <code class="docutils literal"><span class="pre">main.cfg</span></code>. This will specify that this is the specific protocol version the service want to use (so you may set also locally to service rather than globally).</p>
311</div>
312<div class="section" id="styling">
313<h4>Styling<a class="headerlink" href="#styling" title="Permalink to this headline"></a></h4>
314<p>The optional <code class="docutils literal"><span class="pre">msStyle</span></code> parameter can also be used to define a custom MapServer style block (used for vector datasource only), as follow:</p>
315<div class="highlight-guess"><div class="highlight"><pre>msStyle = STYLE COLOR 125 0 105 OUTLINECOLOR 0 0 0 WIDTH 3 END
316</pre></div>
317</div>
318<p>If a WPS service outputs a one band raster file, then it is possible to add a <code class="docutils literal"><span class="pre">msClassify</span></code> parameter and set it to <code class="docutils literal"><span class="pre">true</span></code> in the output ComplexData <code class="docutils literal"><span class="pre">&lt;Default&gt;</span></code> or <code class="docutils literal"><span class="pre">&lt;Supported&gt;</span></code> nodes of its <code class="docutils literal"><span class="pre">zcfg</span></code> file. This allows ZOO-Kernel to use its own default style definitions in order to classify the raster using equivalent intervals.</p>
319<div class="highlight-guess"><div class="highlight"><pre>msClassify = ....
320</pre></div>
321</div>
322</div>
323<div class="section" id="example">
324<h4>Example<a class="headerlink" href="#example" title="Permalink to this headline"></a></h4>
325<p>An example <a class="reference internal" href="../services/zcfg-reference.html#services-zcfg"><span>ZOO-Service configuration file</span></a> file configured for the optional MapServer support is shown bellow:</p>
326<div class="highlight-guess"><div class="highlight"><pre><span class="nt">&lt;Default&gt;</span>
327 mimeType = text/xml
328 encoding = UTF-8
329 schema = http://schemas.opengis.net/gml/3.1.0/base/feature.xsd
330 useMapserver = true
331<span class="nt">&lt;/Default&gt;</span>
332<span class="nt">&lt;Supported&gt;</span>
333 mimeType = image/png
334 useMapserver = true
335 asReference = true
336 msStyle = STYLE COLOR 125 0 105 OUTLINECOLOR 0 0 0 WIDTH 3 END
337<span class="nt">&lt;/Supported&gt;</span>
338<span class="nt">&lt;Supported&gt;</span>
339 mimeType = application/vnd.google-earth.kmz
340 useMapserver = true
341 asReference = true
342 msStyle = STYLE COLOR 125 0 105 OUTLINECOLOR 0 0 0 WIDTH 3 END
343<span class="nt">&lt;/Supported&gt;</span>
344<span class="nt">&lt;Supported&gt;</span>
345 mimeType = image/tif
346 useMapserver = true
347 asReference = true
348 msClassify = ....
349<span class="nt">&lt;/Supported&gt;</span>
350</pre></div>
351</div>
352<p>In this example, the default output <code class="docutils literal"><span class="pre">mimeType</span></code> is <code class="docutils literal"><span class="pre">image/png</span></code>, so a WMS GetMap request will be returned, or the resulting <code class="docutils literal"><span class="pre">image/tiff</span></code> will be returned as WCS GetCoverage request.</p>
353</div>
354</div>
355</div>
356<div class="section" id="test-requests">
357<h2>Test requests<a class="headerlink" href="#test-requests" title="Permalink to this headline"></a></h2>
358<p>The optional MapServer support can be tested using any service. The
359simple <em>HelloPy</em> Service is used in the following example requests.</p>
360<div class="admonition note">
361<p class="first admonition-title">Note</p>
362<p class="last">The following examples require a zip file containing a Shapefile (<a class="reference external" href="http://localhost/data/data.zip">http://localhost/data/data.zip</a>) and a tif file (<a class="reference external" href="http://localhost/data/demo.tif">http://localhost/data/demo.tif</a>)</p>
363</div>
364<p>Accessing a remote Zipped Shapefile as WFS GetFeatures Request:</p>
365<div class="highlight-guess"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&amp;service=WPS&amp;version=1.0.0&amp;Identifier=HelloPy&amp;DataInputs=a=Reference@xlink:href=http://localhost/data/data.zip&amp;ResponseDocument=Result@asReference=true@mimetype=text/xml
366</pre></div>
367</div>
368<p>Accessing a remote Zipped Shapefile as WMS GetMap Request:</p>
369<div class="highlight-guess"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&amp;service=WPS&amp;version=1.0.0&amp;Identifier=HelloPy&amp;DataInputs=a=Reference@xlink:href=http://localhost/data/data.zip&amp;ResponseDocument=Result@asReference=true@mimetype=image/png
370</pre></div>
371</div>
372<p>Accessing a remote tiff as WMS GetMap Request:</p>
373<div class="highlight-guess"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&amp;service=WPS&amp;version=1.0.0&amp;Identifier=HelloPy&amp;DataInputs=a=Reference@xlink:href=http://localhost/data/data.tiff&amp;ResponseDocument=Result@asReference=true@mimetype=image/png
374</pre></div>
375</div>
376<p>Accessing a remote tiff as WCS GetMap Request:</p>
377<div class="highlight-guess"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&amp;service=WPS&amp;version=1.0.0&amp;Identifier=HelloPy&amp;DataInputs=a=Reference@xlink:href=http://localhost/data/data.tiff&amp;ResponseDocument=Result@asReference=true@mimetype=image/tiff
378</pre></div>
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