 (blank or containing
user-defined landscape) or using a real Earth cartographic data from the
Natural Earth project (<a href="https://www.naturalearthdata.com" class="external-link">https://www.naturalearthdata.com</a>).</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">world</span><span class="op">(</span></span>
<span>  <span class