="anchor" href="#arg-is-lonlat"></a></dt>
<dd><p>logical; if the points are in unprojected, lon-lat
coordinates. In this case, the input data frame should have columns
<code>"longitude"</code> and <code>"latitude"</code> and the points will be projected to an equal
area Eckert IV CRS prior to grid assignment.</p></dd>


<dt id="arg-res">res<a class="anchor" aria-label="anchor" href="#arg-res"></a></dt>
<dd><p>numeric; resolution of the grid in the <code>x</code>, <code>y</code>, and <code>t</code>
dimension