Rivalry2

Картограммы в R. Часть 1
2026-03-10 00:33 Diff
Теги: визуализация данных в r, картограммы, программирование на r, shape-файл, пакеты для создания карт, пакеты для обработки данных
Визуализация данных в R — крайне обширная и разнообразная тема. Существует большое количество как и самих форм презентации информации (т. е. самих видов графиков), так и пакетов, расширяющих возможности языка под отдельные задачи. В частности, R способен визуализировать пространственные данные посредством картограмм. В данном посте и пойдёт речь об этом не самом распространённом виде диаграмм.
Небольшая ремарка: подобные графики корректнее называть картограммами, а не картами, поскольку карты — это чертёж земной (в нашем случае) поверхности, а картограмма — способ изобразить статистические данные в пространстве. Но для краткости мы всё равно будем называть их «картами».
Пакеты для карт

С картами в R справится как и обычный plot(), так и средства пакетов ggplot и ggmap.
#пакеты для создания карт: library("ggplot2") library("maptools") library("tmap") library("mapproj") #пакеты для обработки данных и прочего library("rgdal") library("rgeos") library("tidyverse") library("stringr") library("RColorBrewer")
Откуда берутся карты?

Говоря простым языком, карту можно представить в виде точек, линий и многоугольников (полигонов), в зависимости от того, что именно планируется изобразить. У нас речь пойдёт про регионы, поэтому будем рисовать полигоны.
Проще всего скачать уже готовую карту и сразу начать с ней работать. В R для этой цели можно использовать файлы с расширениями .shp (shape-файлы) и geoJSON.
В качестве примера можно взять какой-нибудь свободный набор данных, например, здесь:
map_shp <- readOGR(dsn = "~/Regions/Regions.shp") ## OGR data source with driver: ESRI Shapefile ## Source: "/Users/akondrashov/Regions/Regions.shp", layer: "Regions" ## with 83 features ## It has 2 fields
Получим объект с 2 полями (название региона — субъекта и какого округу он принадлежит) и 83 записями (83 региона в России). Объект shape-файла несколько отличается от привычных в R объектов: обращаться к его полям всё ещё можно через $, однако самое важное находится в слотах — к ним можно обратиться через @.
Структуру в этой заметке мы приводить не будем, из важного заметим, что помимо названий регионов, объект содержит координаты полигонов (границ регионов), а также используемый метод проекции.
kable(head(map_shp@data, 10), caption = "Первые 10 строчек")
Первые 10 строчек

NAME ADM3_NAME 0 Курганская область Уральский федеральный округ 1 Архангельская область Северо-Западный федеральный округ 2 Ненецкий автономный округ Северо-Западный федеральный округ 3 Новгородская область Северо-Западный федеральный округ 4 Курская область Центральный федеральный округ 5 Липецкая область Центральный федеральный округ 6 Магаданская область Дальневосточный федеральный округ 7 Камчатский край Дальневосточный федеральный округ 8 Забайкальский край Сибирский федеральный округ 9 Республика Бурятия Сибирский федеральный округ
Что же, теперь займёмся самым интересным — «рисовашками». Но об этом поговорим в следующей части!







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    <div class="post-info__time">01.07.19 в 11:20</div>
    
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    <h1 class="blog__h1">Картограммы в R. Часть 1</h1>


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            Теги: визуализация данных в r, картограммы, программирование на r, shape-файл, пакеты для создания карт, пакеты для обработки данных
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                    <p><img alt="R_Deep_9.07_Site-5020-2fe52c.png" src="https://cdn.otus.ru/media/public/2f/e5/R_Deep_9.07_Site-5020-2fe52c.png"></p>
<p><strong>Визуализация данных в R</strong> — крайне обширная и разнообразная тема. Существует большое количество как и самих форм презентации информации (т. е. самих видов графиков), так и пакетов, <strong>расширяющих возможности языка</strong> под отдельные задачи. В частности, R способен визуализировать пространственные данные посредством картограмм. В данном посте и пойдёт речь об этом не самом распространённом виде диаграмм.<cut></cut></p>
<p><em>Небольшая ремарка</em>: подобные графики корректнее называть <strong>картограммами</strong>, а не картами, поскольку карты — это чертёж земной (в нашем случае) поверхности, а картограмма — способ изобразить статистические данные в пространстве. Но для краткости мы всё равно будем называть их «картами».</p>
<h2>Пакеты для карт</h2>
<p>С картами в R справится как и обычный <codeinline>plot()</codeinline>, так и средства пакетов <strong>ggplot</strong> и <strong>ggmap</strong>.</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">#пакеты для создания карт:</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;ggplot2&quot;</span><span class="p">)</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;maptools&quot;</span><span class="p">)</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;tmap&quot;</span><span class="p">)</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;mapproj&quot;</span><span class="p">)</span>

<span class="c1">#пакеты для обработки данных и прочего</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;rgdal&quot;</span><span class="p">)</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;rgeos&quot;</span><span class="p">)</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;tidyverse&quot;</span><span class="p">)</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;stringr&quot;</span><span class="p">)</span>
<span class="kn">library</span><span class="p">(</span><span class="s">&quot;RColorBrewer&quot;</span><span class="p">)</span>
</pre></div>
</pre>

<h2>Откуда берутся карты?</h2>
<p>Говоря простым языком, карту можно представить в виде точек, линий и многоугольников (полигонов), в зависимости от того, что именно планируется изобразить. У нас <strong>речь пойдёт про регионы</strong>, поэтому будем рисовать полигоны.</p>
<p>Проще всего скачать уже готовую карту и сразу начать с ней работать. В R для этой цели можно использовать <strong>файлы с расширениями .sh</strong>p (shape-файлы) и <strong>geoJSON</strong>.</p>
<p>В качестве примера можно взять какой-нибудь свободный набор данных, например, <a href="http://gisgeo.org/index.php?id=7#GovOpen">здесь</a>: </p>
<pre><div class="codehilite"><pre><span></span>map_shp <span class="o">&lt;-</span> readOGR<span class="p">(</span>dsn <span class="o">=</span> <span class="s">&quot;~/Regions/Regions.shp&quot;</span><span class="p">)</span>
<span class="c1">## OGR data source with driver: ESRI Shapefile </span>
<span class="c1">## Source: &quot;/Users/akondrashov/Regions/Regions.shp&quot;, layer: &quot;Regions&quot;</span>
<span class="c1">## with 83 features</span>
<span class="c1">## It has 2 fields</span>
</pre></div>
</pre>

<p>Получим объект с 2 полями (название региона — субъекта и какого округу он принадлежит) и 83 записями (83 региона в России). Объект <strong>shape-файла</strong> несколько отличается от привычных в R объектов: обращаться к его полям всё ещё можно через <codeinline>$</codeinline>, однако самое важное находится в слотах — к ним можно обратиться через <codeinline>@</codeinline>. </p>
<p>Структуру в этой заметке мы приводить не будем, из важного заметим, что помимо названий регионов, объект содержит <strong>координаты полигонов</strong> (границ регионов), а также используемый метод проекции.</p>
<pre><div class="codehilite"><pre><span></span>kable<span class="p">(</span><span class="kp">head</span><span class="p">(</span>map_shp<span class="o">@</span>data<span class="p">,</span> <span class="m">10</span><span class="p">),</span> caption <span class="o">=</span> <span class="s">&quot;Первые 10 строчек&quot;</span><span class="p">)</span>
</pre></div>
</pre>

<h2>Первые 10 строчек</h2>
<table>
<thead>
<tr>
<th></th>
<th align="left">NAME</th>
<th align="left">ADM3_NAME</th>
</tr>
</thead>
<tbody>
<tr>
<td>0</td>
<td align="left">Курганская область</td>
<td align="left">Уральский федеральный округ</td>
</tr>
<tr>
<td>1</td>
<td align="left">Архангельская область</td>
<td align="left">Северо-Западный федеральный округ</td>
</tr>
<tr>
<td>2</td>
<td align="left">Ненецкий автономный округ</td>
<td align="left">Северо-Западный федеральный округ</td>
</tr>
<tr>
<td>3</td>
<td align="left">Новгородская область</td>
<td align="left">Северо-Западный федеральный округ</td>
</tr>
<tr>
<td>4</td>
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<td align="left">Центральный федеральный округ</td>
</tr>
<tr>
<td>5</td>
<td align="left">Липецкая область</td>
<td align="left">Центральный федеральный округ</td>
</tr>
<tr>
<td>6</td>
<td align="left">Магаданская область</td>
<td align="left">Дальневосточный федеральный округ</td>
</tr>
<tr>
<td>7</td>
<td align="left">Камчатский край</td>
<td align="left">Дальневосточный федеральный округ</td>
</tr>
<tr>
<td>8</td>
<td align="left">Забайкальский край</td>
<td align="left">Сибирский федеральный округ</td>
</tr>
<tr>
<td>9</td>
<td align="left">Республика Бурятия</td>
<td align="left">Сибирский федеральный округ</td>
</tr>
</tbody>
</table>
<p>Что же, теперь займёмся самым интересным — «<strong>рисовашками</strong>». Но об этом поговорим в <a href="https://otus.ru/nest/post/817/">следующей части</a>! </p>
                
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