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      <h1 data-toc-skip>Collection and pre-processing of cartographic information for Cameroon</h1>
                        <h4 class="author">Facundo Muñoz</h4>
            
            <h4 class="date">2020-04-11</h4>
      
      
      <div class="hidden name"><code>cmr_cartography-rmd.Rmd</code></div>

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<p>Here we demonstrate how we have downloaded and pre-processed the cartographic information for Cameroon which is included in the package.</p>
<div class="sourceCode" id="cb1"><html><body><pre class="r"><span class="fu"><a href="https://rdrr.io/r/base/library.html">require</a></span>(<span class="no">raster</span>)
<span class="co">#&gt; Loading required package: raster</span>
<span class="co">#&gt; Loading required package: sp</span>
<span class="fu"><a href="https://rdrr.io/r/base/library.html">require</a></span>(<span class="no">rgdal</span>)
<span class="co">#&gt; Loading required package: rgdal</span>
<span class="co">#&gt; rgdal: version: 1.4-8, (SVN revision 845)</span>
<span class="co">#&gt;  Geospatial Data Abstraction Library extensions to R successfully loaded</span>
<span class="co">#&gt;  Loaded GDAL runtime: GDAL 3.0.2, released 2019/10/28</span>
<span class="co">#&gt;  Path to GDAL shared files: </span>
<span class="co">#&gt;  GDAL binary built with GEOS: TRUE </span>
<span class="co">#&gt;  Loaded PROJ.4 runtime: Rel. 6.2.1, November 1st, 2019, [PJ_VERSION: 621]</span>
<span class="co">#&gt;  Path to PROJ.4 shared files: (autodetected)</span>
<span class="co">#&gt;  Linking to sp version: 1.4-1</span>

<span class="kw">if</span>(!<span class="fu"><a href="https://rdrr.io/r/base/library.html">require</a></span>(<span class="no">mapview</span>, <span class="kw">quietly</span> <span class="kw">=</span> <span class="fl">TRUE</span>))
  <span class="fu"><a href="https://rdrr.io/r/base/cat.html">cat</a></span>(<span class="st">"We suggest installing the pacakge mapview for interactive visualisation"</span>,
      <span class="st">"of cartography from within R"</span>)
<span class="co">#&gt; Warning in library(package, lib.loc = lib.loc, character.only = TRUE,</span>
<span class="co">#&gt; logical.return = TRUE, : there is no package called 'mapview'</span>
<span class="co">#&gt; We suggest installing the pacakge mapview for interactive visualisation of cartography from within R</span></pre></body></html></div>
<div id="administrative-borders" class="section level2">
<h2 class="hasAnchor">
<a href="#administrative-borders" class="anchor"></a>Administrative borders</h2>
<p>Download cartography from the Global Administrative Borders Database (GADM, <a href="https://gadm.org/" class="uri">https://gadm.org/</a>) directly from within R.</p>
<div class="sourceCode" id="cb2"><html><body><pre class="r">
<span class="no">cmr_admin3</span> <span class="kw">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/raster/man/getData.html">getData</a></span>(<span class="st">'GADM'</span>, <span class="kw">country</span> <span class="kw">=</span> <span class="st">"CMR"</span>, <span class="kw">level</span><span class="kw">=</span><span class="fl">3</span>)
<span class="co"># mapview(cmr_admin3, zcol = "NAME_3")</span></pre></body></html></div>
<div class="sourceCode" id="cb3"><html><body><pre class="r">
<span class="co">## This only works locally.</span>
<span class="no">prodel_path</span> <span class="kw">&lt;-</span> <span class="st">"/home/facu/CmisSync/Cirad/Sites/PRODEL/documentLibrary/carto"</span>
<span class="no">water_bodies</span> <span class="kw">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/rgdal/man/readOGR.html">readOGR</a></span>(<span class="no">prodel_path</span>, <span class="kw">layer</span> <span class="kw">=</span> <span class="st">"wb_cam.shp"</span>)</pre></body></html></div>
<div class="sourceCode" id="cb4"><html><body><pre class="r"><span class="no">national_parks</span> <span class="kw">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/rgdal/man/readOGR.html">readOGR</a></span>(
  <span class="fu"><a href="https://rdrr.io/r/base/file.path.html">file.path</a></span>(<span class="no">prodel_path</span>, <span class="st">"WDPA_Mar2018_CMR-shapefile"</span>),
  <span class="st">"WDPA_Mar2018_CMR-shapefile-polygons"</span>
)</pre></body></html></div>
<div class="sourceCode" id="cb5"><html><body><pre class="r"><span class="co"># Not using this for the moment</span>
<span class="no">ps_cam</span> <span class="kw">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/raster/man/raster.html">raster</a></span>(<span class="st">"ps_cam.tif"</span>)</pre></body></html></div>
<div class="sourceCode" id="cb6"><html><body><pre class="r"><span class="no">animal_density_world</span> <span class="kw">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/raster/man/raster.html">raster</a></span>(<span class="fu"><a href="https://rdrr.io/r/base/file.path.html">file.path</a></span>(<span class="no">prodel_path</span>, <span class="st">"glw"</span>, <span class="st">"WdCt8k_vf_Mn_Rw_To.tif"</span>))
<span class="no">animal_density</span> <span class="kw">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/raster/man/mask.html">mask</a></span>(<span class="fu"><a href="https://rdrr.io/pkg/raster/man/crop.html">crop</a></span>(<span class="no">animal_density_world</span>, <span class="fu"><a href="https://rdrr.io/pkg/raster/man/extent.html">extent</a></span>(<span class="no">cmr_admin3</span>)), <span class="no">cmr_admin3</span>)

<span class="co"># plot(animal_density)</span>
<span class="co"># summary(animal_density$WdCt8k_vf_Mn_Rw_To)</span></pre></body></html></div>
</div>
<div id="save-pre-processed-cartography-for-use-within-the-package" class="section level2">
<h2 class="hasAnchor">
<a href="#save-pre-processed-cartography-for-use-within-the-package" class="anchor"></a>Save pre-processed cartography for use within the package</h2>
<p>Prefer standard and modern Open Geospatial Consortium (<a href="http://www.opengeospatial.org/">OGC</a>) formats: GeoPackage for vector maps and GeoTiff for raster images.</p>
<div class="sourceCode" id="cb7"><html><body><pre class="r"><span class="no">cmr_dir</span> <span class="kw">&lt;-</span> <span class="st">"./inst/cartography/CMR"</span>
<span class="fu"><a href="https://rdrr.io/r/base/files2.html">dir.create</a></span>(<span class="no">cmr_dir</span>, <span class="kw">recursive</span> <span class="kw">=</span> <span class="fl">TRUE</span>)

<span class="fu"><a href="https://rdrr.io/pkg/rgdal/man/writeOGR.html">writeOGR</a></span>(<span class="no">cmr_admin3</span>, <span class="fu"><a href="https://rdrr.io/r/base/file.path.html">file.path</a></span>(<span class="no">cmr_dir</span>, <span class="st">"cmr_admin3.gpkg"</span>), <span class="kw">layer</span> <span class="kw">=</span> <span class="st">"cmr_admin3"</span>, <span class="kw">driver</span> <span class="kw">=</span> <span class="st">"GPKG"</span>)
<span class="fu"><a href="https://rdrr.io/pkg/rgdal/man/writeOGR.html">writeOGR</a></span>(<span class="no">water_bodies</span>, <span class="fu"><a href="https://rdrr.io/r/base/file.path.html">file.path</a></span>(<span class="no">cmr_dir</span>, <span class="st">"water_bodies.gpkg"</span>), <span class="kw">layer</span> <span class="kw">=</span> <span class="st">"water_bodies"</span>, <span class="kw">driver</span> <span class="kw">=</span> <span class="st">"GPKG"</span>)
<span class="fu"><a href="https://rdrr.io/pkg/rgdal/man/writeOGR.html">writeOGR</a></span>(<span class="no">national_parks</span>, <span class="fu"><a href="https://rdrr.io/r/base/file.path.html">file.path</a></span>(<span class="no">cmr_dir</span>, <span class="st">"national_parks.gpkg"</span>), <span class="kw">layer</span> <span class="kw">=</span> <span class="st">"national_parks"</span>, <span class="kw">driver</span> <span class="kw">=</span> <span class="st">"GPKG"</span>)

<span class="fu"><a href="https://rdrr.io/pkg/raster/man/writeRaster.html">writeRaster</a></span>(<span class="no">animal_density</span>, <span class="fu"><a href="https://rdrr.io/r/base/file.path.html">file.path</a></span>(<span class="no">cmr_dir</span>, <span class="st">"animal.density.tif"</span>))</pre></body></html></div>
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