1. A concise explanation of the problem you’re experiencing.
2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.
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.
I don’t know what your use case is exactly, but check out Cesium ion and see if that meets your needs.
Thanks Gabby for your valuable reply actually i want to show the map offline that certain area with high resolution is it possible to do that if from any site i can able to download map data then suggest me which format of data required and also suggest how i integrate that with existing one.
If it’s imagery data, you need to make sure the imagery allows offline use, then serve it through a local server. See the Cesium Offline Guide.
If it’s terrain data, you’ll need to serve terrain locally. To use Cesium ion offline, you can contact Tim if you want an offline solution. You can also take a look at other terrain servers, such as the STK Terrain Server.