Personal terrain question

CesiumJS
1

Hi guys,

I’m trying to set up a personal terrain view of Honolulu, offline. I need some input if I am going about this the right way, or what I’m doing wrong because I’m not getting anything to display.

First, I downloaded imagery from the USGS, used gdal2tiles, and hosted my TMS tiles on an apache server. Cesium sees that fine and I can overlay my imagery and all my zoom layers on the island.

Next, I downloaded 2 SRTM .tif files from USGS. I used docker to run cesium terrain builder. That produced a series of folders, 0-14, each with their corresponding X and Y naming convention inside the zoom folders. I also produced a “layer.json” file containing the following.

“{
“tilejson”: “2.1.0”,
“format”: “heightmap-1.0”,
“version”: “1.0.0”,
“scheme”: “tms”,
“tiles”: [”{z}/{x}/{y}.terrain"]
}"

But when I use the code from the cesium tutorial in my SandCastle (also hosted on the same apache server), nothing appears. I don’t even see a blank sphere of the globe.

Now here is what I think is going on. Since I only use 2 small .tif files of hawaii, the zoom levels that show the entire globe don’t know to render an entire sphere. With googling, it seems that I should be able to download top level tiles to cover this problem. But the links are dead.

Can anyone help me figure this out? Or give me a step by step breakdown of how I can view a small bit of elevation data in cesium, I’m very new to this.

Thanks everyone.

2

Hello,

If nothing is appearing on the screen, it usually means that you application is having trouble finding the terrain tiles.

Are there any error messages in the console?

Best,

Hannah

3

Hi Hannah,

I do have 2 errors, for the top level tiles. This is why I thought I needed to download them from the cesium site (but the link is dead). I figure it cesium terrain builder isn’t building a proper tile when just supplied with a single tif of hawaii.

Also, the elevation/tile1 folder path is where all the zoom level folders are kept (0 through 14) and the layer.json file is kept.