Cesium- Offline terrain elevation data

[nigamr...@gmail.com]

Can you please provide me .terrain files? I need offline terrain elevations data.

I tried accessing this link: http://sergeserver.dyndns.org/phocadownload/terrain.tar.gz

But now it seems the hostname does not exist.

[Rachel Hwang]

Hi there,

Here is some sample data for you to try: https://github.com/AnalyticalGraphicsInc/cesium/tree/master/Specs/Data/CesiumTerrainTileJson

Hope that helps,

- Rachel

[nigamr...@gmail.com]

Hi,

Actually, for the below code:

    var terrainProvider = new Cesium.GeoserverTerrainProvider({ 

        url : "http://localhost:8080/geoserver/wcs/wms", 
        layerName: "wcs:clip11(reproject)", 

        waterMask:true 
    }); 
    globe.terrainProvider = terrainProvider; 

Where do i get the geoserver folder from?

[The geoserver folder to be hosted at 8080]

---

The link which you have shared has only 1 .terrain file. Does it contain offline elevation data for whole globe?

Thanks.

[Rachel Hwang]

Hi there,

Here is some global terrain data: https://cesiumjs.org/data-and-assets/terrain/index.html

However, note that it's free for Internet use, but click on the individual datasets for information on offline terms of use. 

Hope that helps,

- Rachel

[nigamr...@gmail.com]

Hi,

When i write below code:

        terrainProvider : new Cesium.CesiumTerrainProvider({

url : '//assets.agi.com/stk-terrain/world'

})

I can see map on the globe , but when i write below code:

 

var terrainProvider = new Cesium.GeoserverTerrainProvider({

      url: "http://localhost:8080/geoserver/wms?SERVICE=WMS&REQUEST=GetCapabilities&tiled=true",

      layerName: "SRTM90",

      styleName: "grayToColor",

      waterMask: true

})

Then i cant see neither map nor globe. Whole screen becomes black when i from switch from ol3 to ol3cesium using below code:

this.map = new ol.Map({

});

this.ol3d = new olcs.OLCesium({ map: this.map });

Why is it coming as black!

[Guillaume Beraudo]

Hi,

Have you tested the GeoserverTerrainProvider is working in a pure Cesium application?

Guillaume

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[nigamr...@gmail.com]

Hi,

No, I havent tested 'GeoserverTerrainProvider' on a pure cesium app. 

Actually my app is not purely cesium app, my app should support both ol3 and ol3cesium/cesium.

So, i have made a button, which allows switching from 2d to 3d mode (i.e. ol3 to ol3cesium mode). But now in the 3d, i.e. ol3cesium globe mode, I have to show elevations using offline data. For which i made the geoserver setup done.

But now the problem is coming up that earlier i was able to see the map using :

source: new ol.source.Stamen({

        layer: 'terrain'

      })

map in ol3 and when switching to ol3cesium i was able to see elevations using:

var terrainProvider = new Cesium.CesiumTerrainProvider({

      url: 'https://assets.agi.com/stk-terrain/world'

    });

    scene.terrainProvider = terrainProvider;

BUT, now when i switch to ol3cesium i see blank screen , i cant see globe when i use:

 var terrainProvider = new Cesium.GeoserverTerrainProvider({

      //url: "http://localhost:8080/geoserver/wms?SERVICE=WMS&REQUEST=GetCapabilities&tiled=true",   

      layerName: "SRTM90",

      styleName: "grayToColor",

      waterMask: true

    });

  

Thanks.

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[Guillaume Beraudo]

Hi,

Yes I understand your use case, I am the main dev of OL-Cesium.

Making sure the problem is not a pure Cesium bug would help analyze your issue.

Guillaume

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[nigamr...@gmail.com]

Hi Guillaume,

I solved the blank black screen problem by changing the code as below:

var globe = new Cesium.Globe(Cesium.Ellipsoid.WGS84);    

    var terrainProvider = new Cesium.GeoserverTerrainProvider({      

      url: "http://localhost:8080/geoserver/ows?service=wms&version=1.3.0&request=GetCapabilities",

      //layerName: "SRTM90",

      //styleName: "grayToColor",

      waterMask: false

    });

    globe.terrainProvider = terrainProvider;

Am not sure if this is the correct way though.

BUT, i cant see any elevations ! What am i missing?

Please guide.

[Guillaume Beraudo]

Don't know.

Have you considered using https://github.com/geo-data/cesium-terrain-builder instead?

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[nigamr...@gmail.com]

I am trying to install cesium terrain builder, but getting an error of wanting gdal version 2.0.0 during setup.

I think using ctb i can convert .tif to .terrain and then use those .terrain files in my app. Right?

[Guillaume Beraudo]

Yes

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[nigamr...@gmail.com]

Hi Guillaume,

I have got the elevations of a particular region by hosting the .terrain files on a local server on my machine by below code:

var terrainProvider = new Cesium.CesiumTerrainProvider({

      url: 'http://localhost:8080/terrain/terrain_52_06'

    });

    this.scene.terrainProvider = terrainProvider;

But now i dont want it from "server", but read directly from the local filesystem without server then what should be the code ?

[nigamr...@gmail.com]

Please guide.. 

How to read directly from the local filesystem without server. What should be the code ?

[Rachel Hwang]

The files must be hosted on a server in order for Cesium to access them -- this is just a general security feature of the browser.

Hope that helps,

- Rachel

[nigamr...@gmail.com]

Hi Rachel,

My web app is already hosted on node server at 3005. So i wrote below code:

 var terrainProvider = new Cesium.CesiumTerrainProvider({

      url: './app/map/terrain_52_06'

    });

 this.scene.terrainProvider = terrainProvider;

I get to see elevations of that one area. BUT i can also see unwanted elevated spikes all over remaining world.

What could be the issue?

[Rachel Hwang]

Hi there,

It looks like this might be either a server configuration problem, or a problem directly with your tileset. Unfortunately, this isn't enough information for us to help you diagnose your problems. I would recommend checking the rest of your setup, because I'm not sure this is a directly Cesium issue. If you narrow it down a little more, perhaps we could help answer more specific questions.

Hope that helps,

- Rachel

[nigamr...@gmail.com]

Actually my app is running on node server (port 3005) and when i host terrain elevation data on tomcat (port 8080) and enable CORS, I get to see perfect elevations of my one area.
But when i don't use tomcat and host data from node server (port 3005) using code shared before, I can see unwanted elevated spikes.