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<li><a href="#import-from-lat-long-file" id="toc-import-from-lat-long-file" class="nav-link active" data-scroll-target="#import-from-lat-long-file"> <span class="header-section-number">2.1</span> Import from lat / long file</a></li>
<li><a href="#online-databases" id="toc-online-databases" class="nav-link" data-scroll-target="#online-databases"> <span class="header-section-number">2.2</span> Online databases</a></li>
<li><a href="#openstreetmap" id="toc-openstreetmap" class="nav-link" data-scroll-target="#openstreetmap"> <span class="header-section-number">2.3</span> OpenStreetMap</a>
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<li><a href="#display-and-interactive-map" id="toc-display-and-interactive-map" class="nav-link" data-scroll-target="#display-and-interactive-map"> <span class="header-section-number">2.3.1</span> Display and interactive map</a></li>
<li><a href="#import-basemaps" id="toc-import-basemaps" class="nav-link" data-scroll-target="#import-basemaps"> <span class="header-section-number">2.3.2</span> Import basemaps</a></li>
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<h1 class="title d-none d-lg-block"><span class="chapter-number">2</span> <span class="chapter-title">Data Acquisition</span></h1>
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<section id="import-from-lat-long-file" class="level2" data-number="2.1">
<h2 data-number="2.1" class="anchored" data-anchor-id="import-from-lat-long-file"><span class="header-section-number">2.1</span> Import from lat / long file</h2>
<p>The function <code>st_as_sf()</code> makes it possible to transform a <code>data.frame</code> container of geographic coordinates into an object <code>sf</code>. Here we use the <code>data.frame</code> <code>places2</code> created in the previous point.</p>
<div class="cell" data-nm="true">
<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(sf)</span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a>place_sf <span class="ot"><-</span> <span class="fu">st_as_sf</span>(<span class="fu">read.csv</span>(<span class="st">"data_cambodia/adress.csv"</span>), <span class="at">coords =</span> <span class="fu">c</span>(<span class="st">"long"</span>, <span class="st">"lat"</span>), <span class="at">crs =</span> <span class="dv">4326</span>)</span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a>place_sf</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="cell-output cell-output-stdout">
<pre class="code-out"><code>Simple feature collection with 2 features and 1 field
Geometry type: POINT
Dimension: XY
Bounding box: xmin: 104.8443 ymin: 11.54366 xmax: 104.9047 ymax: 11.55349
Geodetic CRS: WGS 84
address
1 Phnom Penh International Airport, Phnom Penh, Cambodia
2 Khmer Soviet Friendship Hospital, Phnom Penh, Cambodia
geometry
1 POINT (104.8443 11.55349)
2 POINT (104.9047 11.54366)</code></pre>
</div>
</div>
<p>To crate a <code>sf</code> POINT type object with only one pair of coordinate (WGS84, longitude=0.5, latitude = 45.5) :</p>
<div class="cell" data-nm="true">
<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(sf)</span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a>test_point <span class="ot"><-</span> <span class="fu">st_as_sf</span>(<span class="fu">data.frame</span>(<span class="at">x =</span> <span class="fl">0.5</span>, <span class="at">y =</span> <span class="fl">45.5</span>), <span class="at">coords =</span> <span class="fu">c</span>(<span class="st">"x"</span>, <span class="st">"y"</span>), <span class="at">crs =</span> <span class="dv">4326</span>)</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a>test_point</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="cell-output cell-output-stdout">
<pre class="code-out"><code>Simple feature collection with 1 feature and 0 fields
Geometry type: POINT
Dimension: XY
Bounding box: xmin: 0.5 ymin: 45.5 xmax: 0.5 ymax: 45.5
Geodetic CRS: WGS 84
geometry
1 POINT (0.5 45.5)</code></pre>
</div>
</div>
<p>We can display this object <code>sf</code> on an <a href="https://www.openstreetmap.org/">OpenStreetMap</a> basesmap with the package maptiles <code>maptiles</code> <span class="citation" data-cites="maptiles">(<a href="references.html#ref-maptiles" role="doc-biblioref">Giraud 2021</a>)</span>.</p>
<div class="cell" data-nm="true">
<div class="sourceCode cell-code" id="cb5"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(maptiles)</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a>osm <span class="ot"><-</span> <span class="fu">get_tiles</span>(<span class="at">x =</span> place_sf, <span class="at">zoom =</span> <span class="dv">12</span>)</span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="fu">plot_tiles</span>(osm)</span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a><span class="fu">plot</span>(<span class="fu">st_geometry</span>(place_sf), <span class="at">pch =</span> <span class="dv">2</span>, <span class="at">cex =</span> <span class="dv">2</span>, <span class="at">col =</span> <span class="st">"red"</span>, <span class="at">add =</span> <span class="cn">TRUE</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="cell-output-display">
<p><img src="02-data_acquisition_files/figure-html/display_sf-1.png" class="img-fluid" width="788"></p>
</div>
</div>
</section>
<section id="online-databases" class="level2" data-number="2.2">
<h2 data-number="2.2" class="anchored" data-anchor-id="online-databases"><span class="header-section-number">2.2</span> Online databases</h2>
</section>
<section id="openstreetmap" class="level2" data-number="2.3">
<h2 data-number="2.3" class="anchored" data-anchor-id="openstreetmap"><span class="header-section-number">2.3</span> OpenStreetMap</h2>
<div style="float: right">
<p><img src="img/Openstreetmap_logo.svg" width="150px" padding="1em"></p>
</div>
<p><a href="https://www.openstreetmap.org" target="_blank">OpenStreetMap (OSM)</a> is a participatory mapping project that aim s to buil a free geographic database on a global scale. OpenStreetMap lets you view, edit and use geographic data around the world.</p>
<p><strong>Terms of use</strong></p>
<blockquote class="blockquote">
<p>OpenStreetMap is open data : you are free to use it for ant purpose as long as you credit OpenStreetMap and its contributers. If you modify or rely data in any way, you may distribute the result only under the same license. (…)</p>
</blockquote>
<p><strong>Contributors</strong></p>
<blockquote class="blockquote">
<p>(…) Our contributors incloude enthusiastic mapmakers, GIS professional, engineers running OSM servers, humanitarians mapping disaster-stricken areas and many mmore.(…)</p>
</blockquote>
<section id="display-and-interactive-map" class="level3" data-number="2.3.1">
<h3 data-number="2.3.1" class="anchored" data-anchor-id="display-and-interactive-map"><span class="header-section-number">2.3.1</span> Display and interactive map</h3>
<p>The two main packages that allow to display as interactive map based on OSM are <code>leaflet</code> <span class="citation" data-cites="leaflet">(<a href="references.html#ref-leaflet" role="doc-biblioref">Cheng, Karambelkar, and Xie 2022</a>)</span> and <code>mapview</code> <span class="citation" data-cites="mapview">(<a href="references.html#ref-mapview" role="doc-biblioref">Appelhans et al. 2022</a>)</span>.</p>
<section id="leaflet" class="level4" data-number="2.3.1.1">
<h4 data-number="2.3.1.1" class="anchored" data-anchor-id="leaflet"><span class="header-section-number">2.3.1.1</span> <code>leaflet</code></h4>
<p><img src="img/logo_leaflet.png" align="right" width="200"> <code>leaflet</code> uses the javascript library Leaflet <span class="citation" data-cites="JS-Leaflet">(<a href="references.html#ref-JS-Leaflet" role="doc-biblioref">Agafonkin 2015</a>)</span> to create interactive maps.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb6"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(sf)</span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(leaflet)</span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a>district <span class="ot"><-</span> <span class="fu">st_read</span>(<span class="st">"data_cambodia/cambodia.gpkg"</span>, <span class="at">layer =</span> <span class="st">"district"</span>, <span class="at">quiet =</span> <span class="cn">TRUE</span>)</span>
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a>hospital <span class="ot"><-</span> <span class="fu">st_read</span>(<span class="st">"data_cambodia/cambodia.gpkg"</span>, <span class="at">layer =</span> <span class="st">"hospital"</span>, <span class="at">quiet =</span> <span class="cn">TRUE</span>)</span>
<span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a>banan <span class="ot"><-</span> district[district<span class="sc">$</span>ADM2_PCODE <span class="sc">==</span> <span class="st">"KH0201"</span>, ] <span class="co">#Select one district (Banan district: KH0201)</span></span>
<span id="cb6-9"><a href="#cb6-9" aria-hidden="true" tabindex="-1"></a>health_banan <span class="ot"><-</span> hospital[hospital<span class="sc">$</span>DCODE <span class="sc">==</span> <span class="st">"201"</span>, ] <span class="co">#Select Health centers in Banan</span></span>
<span id="cb6-10"><a href="#cb6-10" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-11"><a href="#cb6-11" aria-hidden="true" tabindex="-1"></a>banan <span class="ot"><-</span> <span class="fu">st_transform</span>(banan, <span class="dv">4326</span>) <span class="co">#Transform coordinate system to WGS84</span></span>
<span id="cb6-12"><a href="#cb6-12" aria-hidden="true" tabindex="-1"></a>health_banan <span class="ot"><-</span> <span class="fu">st_transform</span>(health_banan, <span class="dv">4326</span>)</span>
<span id="cb6-13"><a href="#cb6-13" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-14"><a href="#cb6-14" aria-hidden="true" tabindex="-1"></a>banan_map <span class="ot"><-</span> <span class="fu">leaflet</span>(banan) <span class="sc">%>%</span> <span class="co">#Create interactive map</span></span>
<span id="cb6-15"><a href="#cb6-15" aria-hidden="true" tabindex="-1"></a> <span class="fu">addTiles</span>() <span class="sc">%>%</span></span>
<span id="cb6-16"><a href="#cb6-16" aria-hidden="true" tabindex="-1"></a> <span class="fu">addPolygons</span>() <span class="sc">%>%</span></span>
<span id="cb6-17"><a href="#cb6-17" aria-hidden="true" tabindex="-1"></a> <span class="fu">addMarkers</span>(<span class="at">data =</span> health_banan)</span>
<span id="cb6-18"><a href="#cb6-18" aria-hidden="true" tabindex="-1"></a>banan_map</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="cell-output-display">
<div id="htmlwidget-a788e0ad1bb5305cd165" style="width:100%;height:464px;" class="leaflet html-widget"></div>
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</div>
</div>
<div class="callout-note callout callout-style-simple no-icon">
<div class="callout-body d-flex">
<div class="callout-icon-container">
<i class="callout-icon no-icon"></i>
</div>
<div class="callout-body-container">
<p>Website of <code>leaflet</code><br>
<a href="https://rstudio.github.io/leaflet/">Leaflet for R</a></p>
</div>
</div>
</div>
</section>
<section id="mapview" class="level4" data-number="2.3.1.2">
<h4 data-number="2.3.1.2" class="anchored" data-anchor-id="mapview"><span class="header-section-number">2.3.1.2</span> <code>mapview</code></h4>
<p><img src="img/logo_mapview.gif" align="right" width="150"> <code>mapview</code> relies on <code>leaflet</code> to create interactive maps, its use is easier and its documentation is a bit dense.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb7"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(mapview)</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="fu">mapview</span>(banan) <span class="sc">+</span> <span class="fu">mapview</span>(health_banan)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="cell-output-display">
<div id="htmlwidget-a69edeea7880baad2383" style="width:100%;height:464px;" class="leaflet html-widget"></div>
<script type="application/json" 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class='scrollableContainer'><table class=mapview-popup id='popup'><tr class='coord'><td><\/td><th><b>Feature ID <\/b><\/th><td>13 <\/td><\/tr><tr><td>1<\/td><th>ADM2_EN <\/th><td>Banan <\/td><\/tr><tr><td>2<\/td><th>ADM2_PCODE <\/th><td>KH0201 <\/td><\/tr><tr><td>3<\/td><th>ADM1_EN <\/th><td>Battambang <\/td><\/tr><tr><td>4<\/td><th>ADM1_PCODE <\/th><td>KH02 <\/td><\/tr><tr><td>5<\/td><th>Male <\/th><td>54337 <\/td><\/tr><tr><td>6<\/td><th>Female <\/th><td>53116 <\/td><\/tr><tr><td>7<\/td><th>T_POP <\/th><td>107453 <\/td><\/tr><tr><td>8<\/td><th>Area.Km2. <\/th><td>874.4773 <\/td><\/tr><tr><td>9<\/td><th>Status <\/th><td><4500km2 <\/td><\/tr><tr><td>10<\/td><th>DENs <\/th><td>122.8768 <\/td><\/tr><tr><td>11<\/td><th>geom <\/th><td>sfc_MULTIPOLYGON <\/td><\/tr><\/table><\/div>",{"maxWidth":800,"minWidth":50,"autoPan":true,"keepInView":false,"closeButton":true,"closeOnClick":true,"className":""},"13",{"interactive":false,"permanent":false,"direction":"auto","opacity":1,"offset":[0,0],"textsize":"10px","textOnly":false,"className":"","sticky":true},{"stroke":true,"weight":1,"opacity":0.9,"fillOpacity":0.84,"bringToFront":false,"sendToBack":false}]},{"method":"addScaleBar","args":[{"maxWidth":100,"metric":true,"imperial":true,"updateWhenIdle":true,"position":"bottomleft"}]},{"method":"addHomeButton","args":[102.829101562,12.7706909180001,103.221313477,13.1356811520001,true,"banan","Zoom 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ID <\/b><\/th><td>50 <\/td><\/tr><tr><td>1<\/td><th>PCODE <\/th><td>2 <\/td><\/tr><tr><td>2<\/td><th>PNAME <\/th><td>Battambang <\/td><\/tr><tr><td>3<\/td><th>DCODE <\/th><td>201 <\/td><\/tr><tr><td>4<\/td><th>DNAME <\/th><td>Banan <\/td><\/tr><tr><td>5<\/td><th>CCODE <\/th><td>20104 <\/td><\/tr><tr><td>6<\/td><th>CNAME <\/th><td>Chheu Teal <\/td><\/tr><tr><td>7<\/td><th>VCODE <\/th><td>2010407 <\/td><\/tr><tr><td>8<\/td><th>VNAME <\/th><td>Bay Damram <\/td><\/tr><tr><td>9<\/td><th>ODCODE <\/th><td>0204 <\/td><\/tr><tr><td>10<\/td><th>ODNAME <\/th><td>Bat Dambang <\/td><\/tr><tr><td>11<\/td><th>FACILITCOD <\/th><td>020412 <\/td><\/tr><tr><td>12<\/td><th>FACILITNAM <\/th><td>Chheu Teal <\/td><\/tr><tr><td>13<\/td><th>COVERNAME <\/th><td>Chheu Teal communce, Bat Dambang commune <\/td><\/tr><tr><td>14<\/td><th>geom <\/th><td>sfc_POINT <\/td><\/tr><\/table><\/div>","<div class='scrollableContainer'><table class=mapview-popup id='popup'><tr class='coord'><td><\/td><th><b>Feature 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class='coord'><td><\/td><th><b>Feature ID <\/b><\/th><td>52 <\/td><\/tr><tr><td>1<\/td><th>PCODE <\/th><td>2 <\/td><\/tr><tr><td>2<\/td><th>PNAME <\/th><td>Battambang <\/td><\/tr><tr><td>3<\/td><th>DCODE <\/th><td>201 <\/td><\/tr><tr><td>4<\/td><th>DNAME <\/th><td>Banan <\/td><\/tr><tr><td>5<\/td><th>CCODE <\/th><td>20105 <\/td><\/tr><tr><td>6<\/td><th>CNAME <\/th><td>Chaeng Mean Chey <\/td><\/tr><tr><td>7<\/td><th>VCODE <\/th><td>2010506 <\/td><\/tr><tr><td>8<\/td><th>VNAME <\/th><td>Changhour Svay <\/td><\/tr><tr><td>9<\/td><th>ODCODE <\/th><td>0204 <\/td><\/tr><tr><td>10<\/td><th>ODNAME <\/th><td>Bat Dambang <\/td><\/tr><tr><td>11<\/td><th>FACILITCOD <\/th><td>020405 <\/td><\/tr><tr><td>12<\/td><th>FACILITNAM <\/th><td>Chaeng Mean Chey <\/td><\/tr><tr><td>13<\/td><th>COVERNAME <\/th><td>Chaeng Mean Chey Commune. 7 Vill <\/td><\/tr><tr><td>14<\/td><th>geom <\/th><td>sfc_POINT <\/td><\/tr><\/table><\/div>","<div class='scrollableContainer'><table class=mapview-popup id='popup'><tr class='coord'><td><\/td><th><b>Feature ID <\/b><\/th><td>53 <\/td><\/tr><tr><td>1<\/td><th>PCODE <\/th><td>2 <\/td><\/tr><tr><td>2<\/td><th>PNAME <\/th><td>Battambang <\/td><\/tr><tr><td>3<\/td><th>DCODE <\/th><td>201 <\/td><\/tr><tr><td>4<\/td><th>DNAME <\/th><td>Banan <\/td><\/tr><tr><td>5<\/td><th>CCODE <\/th><td>20106 <\/td><\/tr><tr><td>6<\/td><th>CNAME <\/th><td>Phnum Sampov <\/td><\/tr><tr><td>7<\/td><th>VCODE <\/th><td>2010604 <\/td><\/tr><tr><td>8<\/td><th>VNAME <\/th><td>Phnum Sampov Lech <\/td><\/tr><tr><td>9<\/td><th>ODCODE <\/th><td>0204 <\/td><\/tr><tr><td>10<\/td><th>ODNAME <\/th><td>Bat Dambang <\/td><\/tr><tr><td>11<\/td><th>FACILITCOD <\/th><td>020416 <\/td><\/tr><tr><td>12<\/td><th>FACILITNAM <\/th><td>Phnum Sampov <\/td><\/tr><tr><td>13<\/td><th>COVERNAME <\/th><td>Phnum Sampov Commune, 10 Vill <\/td><\/tr><tr><td>14<\/td><th>geom <\/th><td>sfc_POINT <\/td><\/tr><\/table><\/div>","<div class='scrollableContainer'><table class=mapview-popup id='popup'><tr class='coord'><td><\/td><th><b>Feature ID <\/b><\/th><td>54 <\/td><\/tr><tr><td>1<\/td><th>PCODE <\/th><td>2 <\/td><\/tr><tr><td>2<\/td><th>PNAME <\/th><td>Battambang <\/td><\/tr><tr><td>3<\/td><th>DCODE <\/th><td>201 <\/td><\/tr><tr><td>4<\/td><th>DNAME <\/th><td>Banan <\/td><\/tr><tr><td>5<\/td><th>CCODE <\/th><td>20107 <\/td><\/tr><tr><td>6<\/td><th>CNAME <\/th><td>Snoeng <\/td><\/tr><tr><td>7<\/td><th>VCODE <\/th><td>2010704 <\/td><\/tr><tr><td>8<\/td><th>VNAME <\/th><td>Snoeng Kaeut <\/td><\/tr><tr><td>9<\/td><th>ODCODE <\/th><td>0204 <\/td><\/tr><tr><td>10<\/td><th>ODNAME <\/th><td>Bat Dambang <\/td><\/tr><tr><td>11<\/td><th>FACILITCOD <\/th><td>020414 <\/td><\/tr><tr><td>12<\/td><th>FACILITNAM <\/th><td>Snoeng <\/td><\/tr><tr><td>13<\/td><th>COVERNAME <\/th><td>Snoeng Commune, 11 Vill <\/td><\/tr><tr><td>14<\/td><th>geom <\/th><td>sfc_POINT <\/td><\/tr><\/table><\/div>","<div class='scrollableContainer'><table class=mapview-popup id='popup'><tr class='coord'><td><\/td><th><b>Feature ID <\/b><\/th><td>55 <\/td><\/tr><tr><td>1<\/td><th>PCODE <\/th><td>2 <\/td><\/tr><tr><td>2<\/td><th>PNAME <\/th><td>Battambang <\/td><\/tr><tr><td>3<\/td><th>DCODE <\/th><td>201 <\/td><\/tr><tr><td>4<\/td><th>DNAME <\/th><td>Banan <\/td><\/tr><tr><td>5<\/td><th>CCODE <\/th><td>20108 <\/td><\/tr><tr><td>6<\/td><th>CNAME <\/th><td>Ta Kream <\/td><\/tr><tr><td>7<\/td><th>VCODE <\/th><td>2010802 <\/td><\/tr><tr><td>8<\/td><th>VNAME <\/th><td>Ta Kream <\/td><\/tr><tr><td>9<\/td><th>ODCODE <\/th><td>0204 <\/td><\/tr><tr><td>10<\/td><th>ODNAME <\/th><td>Bat Dambang <\/td><\/tr><tr><td>11<\/td><th>FACILITCOD <\/th><td>020415 <\/td><\/tr><tr><td>12<\/td><th>FACILITNAM <\/th><td>Ta Kream <\/td><\/tr><tr><td>13<\/td><th>COVERNAME <\/th><td>Ta Kream Commune, 11 Vill <\/td><\/tr><tr><td>14<\/td><th>geom <\/th><td>sfc_POINT <\/td><\/tr><\/table><\/div>"],{"maxWidth":800,"minWidth":50,"autoPan":true,"keepInView":false,"closeButton":true,"closeOnClick":true,"className":""},["50","51","52","53","54","55"],{"interactive":false,"permanent":false,"direction":"auto","opacity":1,"offset":[0,0],"textsize":"10px","textOnly":false,"className":"","sticky":true},null]},{"method":"addHomeButton","args":[103.051274915643,12.8720155591406,103.160327966176,13.059247470427,true,"health_banan","Zoom to health_banan","<strong> health_banan <\/strong>","bottomright"]},{"method":"addLayersControl","args":[["CartoDB.Positron","CartoDB.DarkMatter","OpenStreetMap","Esri.WorldImagery","OpenTopoMap"],["banan","health_banan"],{"collapsed":true,"autoZIndex":true,"position":"topleft"}]},{"method":"addLegend","args":[{"colors":["#6666FF"],"labels":["health_banan"],"na_color":null,"na_label":"NA","opacity":1,"position":"topright","type":"factor","title":"","extra":null,"layerId":null,"className":"info legend","group":"health_banan"}]},{"method":"addHomeButton","args":[102.829101562,12.7706909180001,103.221313477,13.1356811520001,true,null,"Zoom to full extent","<strong>Zoom full<\/strong>","bottomleft"]}],"limits":{"lat":[12.7706909180001,13.1356811520001],"lng":[102.829101562,103.221313477]},"fitBounds":[12.7706909180001,102.829101562,13.1356811520001,103.221313477,[]]},"evals":[],"jsHooks":{"render":[{"code":"function(el, x, data) {\n return (\n function(el, x, data) {\n // get the leaflet map\n var map = this; //HTMLWidgets.find('#' + el.id);\n // we need a new div element because we have to handle\n // the mouseover output separately\n // debugger;\n function addElement () {\n // generate new div Element\n var newDiv = $(document.createElement('div'));\n // append at end of leaflet htmlwidget container\n $(el).append(newDiv);\n //provide ID and style\n newDiv.addClass('lnlt');\n newDiv.css({\n 'position': 'relative',\n 'bottomleft': '0px',\n 'background-color': 'rgba(255, 255, 255, 0.7)',\n 'box-shadow': '0 0 2px #bbb',\n 'background-clip': 'padding-box',\n 'margin': '0',\n 'padding-left': '5px',\n 'color': '#333',\n 'font': '9px/1.5 \"Helvetica Neue\", Arial, Helvetica, sans-serif',\n 'z-index': '700',\n });\n return newDiv;\n }\n\n\n // check for already existing lnlt class to not duplicate\n var lnlt = $(el).find('.lnlt');\n\n if(!lnlt.length) {\n lnlt = addElement();\n\n // grab the special div we generated in the beginning\n // and put the mousmove output there\n\n map.on('mousemove', function (e) {\n if (e.originalEvent.ctrlKey) {\n if (document.querySelector('.lnlt') === null) lnlt = addElement();\n lnlt.text(\n ' lon: ' + (e.latlng.lng).toFixed(5) +\n ' | lat: ' + (e.latlng.lat).toFixed(5) +\n ' | zoom: ' + map.getZoom() +\n ' | x: ' + L.CRS.EPSG3857.project(e.latlng).x.toFixed(0) +\n ' | y: ' + L.CRS.EPSG3857.project(e.latlng).y.toFixed(0) +\n ' | epsg: 3857 ' +\n ' | proj4: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs ');\n } else {\n if (document.querySelector('.lnlt') === null) lnlt = addElement();\n lnlt.text(\n ' lon: ' + (e.latlng.lng).toFixed(5) +\n ' | lat: ' + (e.latlng.lat).toFixed(5) +\n ' | zoom: ' + map.getZoom() + ' ');\n }\n });\n\n // remove the lnlt div when mouse leaves map\n map.on('mouseout', function (e) {\n var strip = document.querySelector('.lnlt');\n if( strip !==null) strip.remove();\n });\n\n };\n\n //$(el).keypress(67, function(e) {\n map.on('preclick', function(e) {\n if (e.originalEvent.ctrlKey) {\n if (document.querySelector('.lnlt') === null) lnlt = addElement();\n lnlt.text(\n ' lon: ' + (e.latlng.lng).toFixed(5) +\n ' | lat: ' + (e.latlng.lat).toFixed(5) +\n ' | zoom: ' + map.getZoom() + ' ');\n var txt = document.querySelector('.lnlt').textContent;\n console.log(txt);\n //txt.innerText.focus();\n //txt.select();\n setClipboardText('\"' + txt + '\"');\n }\n });\n\n }\n ).call(this.getMap(), el, x, data);\n}","data":null},{"code":"function(el, x, data) {\n return (function(el,x,data){\n var map = this;\n\n map.on('keypress', function(e) {\n console.log(e.originalEvent.code);\n var key = e.originalEvent.code;\n if (key === 'KeyE') {\n var bb = this.getBounds();\n var txt = JSON.stringify(bb);\n console.log(txt);\n\n setClipboardText('\\'' + txt + '\\'');\n }\n })\n }).call(this.getMap(), el, x, data);\n}","data":null}]}}</script>
</div>
</div>
<div class="callout-note callout callout-style-simple no-icon">
<div class="callout-body d-flex">
<div class="callout-icon-container">
<i class="callout-icon no-icon"></i>
</div>
<div class="callout-body-container">
<p>Website of <code>mapview</code><br>
<a href="https://r-spatial.github.io/mapview/"><code>mapview</code></a></p>
</div>
</div>
</div>
</section>
</section>
<section id="import-basemaps" class="level3" data-number="2.3.2">
<h3 data-number="2.3.2" class="anchored" data-anchor-id="import-basemaps"><span class="header-section-number">2.3.2</span> Import basemaps</h3>
<p>The package <code>maptiles</code> <span class="citation" data-cites="maptiles">(<a href="references.html#ref-maptiles" role="doc-biblioref">Giraud 2021</a>)</span> allows downlaoding and displaying raster basemaps.<br>
The function <code>get_tiles()</code> allow you to download OSM background maps and the function <code>plot_tiles()</code> allows to display them.<br>
Renders are better if the input data used the same coordinate system as the tiles (<a href="https://github.com/riatelab/maptiles#projection">EPSG:3857</a>).</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb8"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(sf)</span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(maptiles)</span>
<span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a>district <span class="ot"><-</span> <span class="fu">st_read</span>(<span class="st">"data_cambodia/cambodia.gpkg"</span>, <span class="at">layer =</span> <span class="st">"district"</span>, <span class="at">quiet =</span> <span class="cn">TRUE</span>)</span>
<span id="cb8-4"><a href="#cb8-4" aria-hidden="true" tabindex="-1"></a>district <span class="ot"><-</span> <span class="fu">st_transform</span>(district, <span class="dv">3857</span>)</span>
<span id="cb8-5"><a href="#cb8-5" aria-hidden="true" tabindex="-1"></a>osm_tiles <span class="ot"><-</span> <span class="fu">get_tiles</span>(<span class="at">x =</span> district, <span class="at">zoom =</span> <span class="dv">10</span>, <span class="at">crop =</span> <span class="cn">TRUE</span>)</span>
<span id="cb8-6"><a href="#cb8-6" aria-hidden="true" tabindex="-1"></a><span class="fu">plot_tiles</span>(osm_tiles)</span>
<span id="cb8-7"><a href="#cb8-7" aria-hidden="true" tabindex="-1"></a><span class="fu">plot</span>(<span class="fu">st_geometry</span>(district), <span class="at">border =</span> <span class="st">"grey20"</span>, <span class="at">lwd =</span> .<span class="dv">7</span>, <span class="at">add =</span> <span class="cn">TRUE</span>)</span>
<span id="cb8-8"><a href="#cb8-8" aria-hidden="true" tabindex="-1"></a><span class="fu">mtext</span>(<span class="at">side =</span> <span class="dv">1</span>, <span class="at">line =</span> <span class="sc">-</span><span class="dv">2</span>, <span class="at">text =</span> <span class="fu">get_credit</span>(<span class="st">"OpenStreetMap"</span>), <span class="at">col=</span><span class="st">"tomato"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="cell-output-display">
<p><img src="02-data_acquisition_files/figure-html/display_point-1.png" class="img-fluid" width="576"></p>
</div>
</div>
<div id="refs" class="references csl-bib-body hanging-indent" role="doc-bibliography" style="display: none">
<div id="ref-JS-Leaflet" class="csl-entry" role="doc-biblioentry">
Agafonkin, Vladimir. 2015. <span>“Leaflet Javascript Libary.”</span>
</div>
<div id="ref-mapview" class="csl-entry" role="doc-biblioentry">
Appelhans, Tim, Florian Detsch, Christoph Reudenbach, and Stefan Woellauer. 2022. <span>“Mapview: Interactive Viewing of Spatial Data in r.”</span> <a href="https://CRAN.R-project.org/package=mapview">https://CRAN.R-project.org/package=mapview</a>.
</div>
<div id="ref-leaflet" class="csl-entry" role="doc-biblioentry">
Cheng, Joe, Bhaskar Karambelkar, and Yihui Xie. 2022. <span>“Leaflet: Create Interactive Web Maps with the JavaScript ’Leaflet’ Library.”</span> <a href="https://CRAN.R-project.org/package=leaflet">https://CRAN.R-project.org/package=leaflet</a>.
</div>
<div id="ref-maptiles" class="csl-entry" role="doc-biblioentry">
Giraud, Timothée. 2021. <span>“Maptiles: Download and Display Map Tiles.”</span> <a href="https://CRAN.R-project.org/package=maptiles">https://CRAN.R-project.org/package=maptiles</a>.
</div>
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</section>
</section>
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