# CZML HeightReference for Cylinder

**URL:** <https://community.cesium.com/t/czml-heightreference-for-cylinder/8273>\
**Category:** CesiumJS\
**Created:** [May 21, 2019, 3:57am UTC](https://community.cesium.com/t/czml-heightreference-for-cylinder/8273 "2019-05-21T03:57:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![david](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/david/32/3484_2.png) [@david](https://community.cesium.com/u/david)\
**Post date:** [May 21, 2019, 3:57am UTC](https://community.cesium.com/t/czml-heightreference-for-cylinder/8273/1 "2019-05-21T03:57:05Z")

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I believe that I already know the answer to this based on the looking around I've done but I currently have a need to have a time dynamic cylinder within Cesium. Since it's time dynamic, naturally I reached for CZML but I don't see a way to clamp a cylinder to the ground. I see the option in the czml docs for other entity types but not cylinders.

Is this option simply not supported? Only asking because I don't know how up to date the CZML documentation is since it seems to be kinda old.

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**Author:** ![omar](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/omar/32/1999_2.png) [@omar](https://community.cesium.com/u/omar)\
**Post date:** [May 27, 2019, 10:55pm UTC](https://community.cesium.com/t/czml-heightreference-for-cylinder/8273/2 "2019-05-27T22:55:58Z")

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My go to is always the Entity documentation instead, so you can see it does support a height reference for a cylinder:

[https://cesiumjs.org/Cesium/Build/Documentation/CylinderGraphics.html?classFilter=CylinderGr](https://cesiumjs.org/Cesium/Build/Documentation/CylinderGraphics.html?classFilter=CylinderGr)

CZML should reflect all properties an Entity can have. If it doesn’t (like what might be in this case) we should open a bug report (or a code contribution!)

Also, you can still do time dynamic stuff without CZML, like in this example: [https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/?src=Time%20Dynamic%20Wheels.html](https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/?src=Time%20Dynamic%20Wheels.html)