---
title: "EXTENT | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Variable EXTENT`Const`

EXTENT: 8192

The maximum value of a coordinate in the internal tile coordinate system. Coordinates of all source features normalized to this extent upon load.

The value is a consequence of the following:

-   Vertex buffer store positions as signed 16 bit integers.
-   One bit is lost for signedness to support tile buffers.
-   One bit is lost because the line vertex buffer used to pack 1 bit of other data into the int.
-   One bit is lost to support features extending past the extent on the right edge of the tile.
-   This leaves us with 2^13 = 8192