# CesiumTerrainProvider don't send net request for terrain tiles when map zoom level changed

**URL:** <https://community.cesium.com/t/cesiumterrainprovider-dont-send-net-request-for-terrain-tiles-when-map-zoom-level-changed/5895>\
**Category:** CesiumJS\
**Created:** [August 1, 2017, 2:26pm UTC](https://community.cesium.com/t/cesiumterrainprovider-dont-send-net-request-for-terrain-tiles-when-map-zoom-level-changed/5895 "2017-08-01T14:26:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Zeng\_Tao](https://avatars.discourse-cdn.com/v4/letter/z/f05b48/32.png) [@Zeng\_Tao](https://community.cesium.com/u/Zeng_Tao)\
**Post date:** [August 1, 2017, 2:26pm UTC](https://community.cesium.com/t/cesiumterrainprovider-dont-send-net-request-for-terrain-tiles-when-map-zoom-level-changed/5895/1 "2017-08-01T14:26:24Z")

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**1. A concise explanation of the problem you’re experiencing.**

[![](https://lh3.googleusercontent.com/-DI71Lv17ASE/WYCN4a0mPbI/AAAAAAAAABc/Kix6vyDA76U-gCSELw80EjMqHEgYM6XBQCLcBGAs/s320/wireshark_capture.png)](https://lh3.googleusercontent.com/-DI71Lv17ASE/WYCN4a0mPbI/AAAAAAAAABc/Kix6vyDA76U-gCSELw80EjMqHEgYM6XBQCLcBGAs/s1600/wireshark_capture.png)

**2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.**

var viewer = new Cesium.Viewer(‘cesiumContainer’);

// Load ArcticDEM terrain

var cesiumTerrainProviderMeshes = new Cesium.CesiumTerrainProvider({

url : ‘[http://192.168.98.201:10050](http://192.168.98.201:10050)’,

requestWaterMask : true,

requestVertexNormals : true

});

viewer.terrainProvider = cesiumTerrainProviderMeshes;

When map zoom level great than 3,cesium never request new terrain tiles;

terrain server environment:

OS: ubuntu 16.4

web server: apache 2 ;

**3. Context. Why do you need to do this? We might know a better way to accomplish your goal.**

**4. The Cesium version you’re using, your operating system and browser.**

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<div class="post-metadata">

**Author:** ![11167](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/11167/32/3821_2.png) [@11167](https://community.cesium.com/u/11167)\
**Post date:** [May 25, 2021, 2:23am UTC](https://community.cesium.com/t/cesiumterrainprovider-dont-send-net-request-for-terrain-tiles-when-map-zoom-level-changed/5895/2 "2021-05-25T02:23:50Z")

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How did you create altitude data?