# Understanding geometric error.

**URL:** <https://community.cesium.com/t/understanding-geometric-error/8480>\
**Category:** CesiumJS\
**Created:** [July 22, 2019, 8:35pm UTC](https://community.cesium.com/t/understanding-geometric-error/8480 "2019-07-22T20:35:39Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![ka\_sc](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/ka_sc/32/2397_2.png) [@ka\_sc](https://community.cesium.com/u/ka_sc)\
**Post date:** [June 19, 2020, 5:04am UTC](https://community.cesium.com/t/understanding-geometric-error/8480/3 "2020-06-19T05:04:12Z")

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I read the advice below for calculating geometric error. My tiles are pure terrain, I can easily find out total height from bounding box but biggest feature width is tricky/slow. Anybody has done that?

```auto
The geometric error can be computed however you like, but often a good estimate is finding 
the diagonal of the largest building/feature in the tile. 
In tileset.json a tile's geometric error will often equal the largest geometric error of its children.
https://github.com/CesiumGS/3d-tiles/issues/162

```

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