# ImageryProviders and levels?

**URL:** <https://community.cesium.com/t/imageryproviders-and-levels/3077>\
**Category:** CesiumJS\
**Created:** [September 17, 2015, 7:19pm UTC](https://community.cesium.com/t/imageryproviders-and-levels/3077 "2015-09-17T19:19:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![TonyD](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/tonyd/32/2135_2.png) [@TonyD](https://community.cesium.com/u/TonyD)\
**Post date:** [September 17, 2015, 7:19pm UTC](https://community.cesium.com/t/imageryproviders-and-levels/3077/1 "2015-09-17T19:19:09Z")

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The imageryProvider classes all allow minimumLevel and maximumLevel specifications. My questions are

1. How do the levels relate to one another? Is each level a fixed resolution?  
2. How does the min/max affect performance?