# Reasons Cesium Ion rejecting CityGML are not transparent

**URL:** https://community.cesium.com/t/reasons-cesium-ion-rejecting-citygml-are-not-transparent/16049
**Category:** Cesium ion
**Created:** [November 8, 2021, 3:52pm UTC](https://community.cesium.com/t/reasons-cesium-ion-rejecting-citygml-are-not-transparent/16049 "2021-11-08T15:52:34Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![jill](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jill/32/4455_2.png) [@jill](https://community.cesium.com/u/jill)
#### Post date: [November 17, 2021, 6:23am UTC](https://community.cesium.com/t/reasons-cesium-ion-rejecting-citygml-are-not-transparent/16049/6 "2021-11-17T06:23:10Z")

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Yes, I can do this by changing the projection of the shapefile before transforming it to CityGML. Based on [this reply](https://community.cesium.com/t/cesium-world-terrain-coordinate-reference-system/15920/2), the Cesium World Terrain coordinate reference system (this is the terrain I am trying to clamp to) is EPSG:4979. But I can’t reproject the shapefiles into that coordinate system because EPSG:4979 is a 3D coordinate system and shapefiles are 2D. What is otherwise a good coordinate system to begin with?

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