---
id: directededge
title: Directed edge mode
sidebar_label: Directed edge mode
slug: /library/index/directededge
---

<div align="center">
  <img height="300" src="/images/edge_mode.png" />
</div>

An H3 Directed Edge index (mode 2) represents a single directed edge between two cells (an "origin" cell and a neighboring "destination" cell). The components of the H3 Directed Edge index are packed into a 64-bit integer in order, highest bit first, as follows:

* 1 bit reserved and set to 0,
* 4 bits to indicate the H3 Unidirectional Edge index mode,
* 3 bits to indicate the edge (1-6) of the origin cell,
* Subsequent bits matching the index bits of the [origin cell](./cell#h3-cell-index).

## Bit layout of H3Index for directed edges

The layout of an `H3Index` is shown below in table form. The interpretation of the "Mode-Dependent" field differs depending on the mode of the index.

<table>
<tr>
  <th></th>
  <th>0x0F</th>
  <th>0x0E</th>
  <th>0x0D</th>
  <th>0x0C</th>
  <th>0x0B</th>
  <th>0x0A</th>
  <th>0x09</th>
  <th>0x08</th>
  <th>0x07</th>
  <th>0x06</th>
  <th>0x05</th>
  <th>0x04</th>
  <th>0x03</th>
  <th>0x02</th>
  <th>0x01</th>
  <th>0x00</th>
</tr>
<tr>
  <th>0x30</th>
  <td>Reserved (0)</td>
  <td colspan="4">Mode (2)</td>
  <td colspan="3">Edge</td>
  <td colspan="4">Resolution</td>
  <td colspan="4">Base cell</td>
</tr>
<tr>
  <th>0x20</th>
  <td colspan="3">Base cell</td>
  <td colspan="3">Digit 1</td>
  <td colspan="3">Digit 2</td>
  <td colspan="3">Digit 3</td>
  <td colspan="3">Digit 4</td>
  <td>Digit 5</td>
</tr>
<tr>
  <th>0x10</th>
  <td colspan="2">Digit 5</td>
  <td colspan="3">Digit 6</td>
  <td colspan="3">Digit 7</td>
  <td colspan="3">Digit 8</td>
  <td colspan="3">Digit 9</td>
  <td colspan="2">Digit 10</td>
</tr>
<tr>
  <th>0x00</th>
  <td>Digit 10</td>
  <td colspan="3">Digit 11</td>
  <td colspan="3">Digit 12</td>
  <td colspan="3">Digit 13</td>
  <td colspan="3">Digit 14</td>
  <td colspan="3">Digit 15</td>
</tr>
</table>
