<p dir="auto">This changes the number of fractional digits to log10(pixels / degrees) with pixels = 2**(8 + zoom) and degrees = 180.</p>
<hr>
<p dir="auto">If you apply the entire <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2459415506" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/5064" data-hovercard-type="pull_request" data-hovercard-url="/openstreetmap/openstreetmap-website/pull/5064/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/pull/5064">#5064</a>, zoom in to the max zoom level, place an endpoint marker and try to drag it around, you'll notice it moves by jumping several pixels. This is because I limit its coordinates to zoom precision and zoom precision is not high enough. Its current version was introduced in <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/openstreetmap/openstreetmap-website/commit/b28511faca45d8d8abc0d3c2fde5a501bbe94062/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/commit/b28511faca45d8d8abc0d3c2fde5a501bbe94062"><tt>b28511f</tt></a>. You can notice something strange about it: the zoom value went from being an argument of <code class="notranslate">Math.pow</code> to an argument of <code class="notranslate">Math.log</code>. <code class="notranslate">zoom</code> is already on a log scale, why do you need to take its log again?</p>
<markdown-accessiblity-table><table role="table">
<thead>
<tr>
<th>zoom</th>
<th>old zoomPrecision</th>
<th>new zoomPrecision</th>
</tr>
</thead>
<tbody>
<tr>
<td>0</td>
<td>0</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>0</td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>3</td>
<td>2</td>
<td>2</td>
</tr>
<tr>
<td>4</td>
<td>2</td>
<td>2</td>
</tr>
<tr>
<td>5</td>
<td>3</td>
<td>2</td>
</tr>
<tr>
<td>6</td>
<td>3</td>
<td>2</td>
</tr>
<tr>
<td>7</td>
<td>3</td>
<td>3</td>
</tr>
<tr>
<td>8</td>
<td>3</td>
<td>3</td>
</tr>
<tr>
<td>9</td>
<td>4</td>
<td>3</td>
</tr>
<tr>
<td>10</td>
<td>4</td>
<td>4</td>
</tr>
<tr>
<td>11</td>
<td>4</td>
<td>4</td>
</tr>
<tr>
<td>12</td>
<td>4</td>
<td>4</td>
</tr>
<tr>
<td>13</td>
<td>4</td>
<td>5</td>
</tr>
<tr>
<td>14</td>
<td>4</td>
<td>5</td>
</tr>
<tr>
<td>15</td>
<td>4</td>
<td>5</td>
</tr>
<tr>
<td>16</td>
<td>4</td>
<td>5</td>
</tr>
<tr>
<td>17</td>
<td>5</td>
<td>6</td>
</tr>
<tr>
<td>18</td>
<td>5</td>
<td>6</td>
</tr>
<tr>
<td>19</td>
<td>5</td>
<td>6</td>
</tr>
<tr>
<td>20</td>
<td>5</td>
<td>7</td>
</tr>
<tr>
<td>21</td>
<td>5</td>
<td>7</td>
</tr>
</tbody>
</table></markdown-accessiblity-table>
<p dir="auto">Some layers go up to zoom 21, precision limits become very noticeable there. Even on level 0 you need at least one digit after <code class="notranslate">.</code> to translate -90..+90 to 256 tile pixels.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/5084'>https://github.com/openstreetmap/openstreetmap-website/pull/5084</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/5084/commits/cfdebb9de76ca31e8915b52a25362e69f016f573" class="commit-link">cfdebb9</a>  Change zoom precision function</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/5084/files">1 file</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5084/files#diff-a9b88a8a3644f944b9bd54361da588c69fa6a210cf7327194c17895a8ad2b0d6">app/assets/javascripts/osm.js.erb</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5084.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/5084.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5084.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/5084.diff</a></li>
</ul>

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