Anyone who has some insight into complications of adding a new tiling schema like WebMercatorProject

CesiumJS
1

What are the main tasks of creating a new tiling schema?

Is cesium reprojecting on the fly from WebMercator to epsg.io/4326 ?

I would like to make something work with a TSM using http://epsg.io/25832 as its coordinate system and a custom tiling scheme. So a few pointers on where to start would be good.

Alternative, what are the roadmap for this? if any.

2

Hi Poul,

You’re planning to use the new tiling scheme for an imagery provider? If so, this is likely to be pretty hard. I highly recommend reprojecting ahead of time or on the server instead.

Kevin

3

I found that and have got everything working with https://epsg.io/25832 except for everything is offsetet with 100km :slight_smile: That was with adding proj4 support and implementing a MapProjection(string:epsg) class that used proj4 to do project/unproject.

I am in the process of looking into how TilingSchema uses its tilexy functions to remap tiles to the globe and if this fails I will fall back to reprojecting on the server.

4

I succeded in getting it working on the client, https://twitter.com/pksorensen/status/636860539440918528, but as seen there are a few artifacts. Need to figure out where exactly this happens since there should not be much difference from this and google/bing tiles.

Anyone who can confirm that there is done nothing special for the epsg:3857 projection in the core of cesium and all logic is handled in the MapProjeciton and TilingSchema, then I know that the issue can be solved outside the cesium core.

5

Just for reference, the tiling schema I got working is documented here: http://kortforsyningen.dk/sites/default/files/old_gst/PDF/tiling44.pdf

6

also here is the current code I am using to do so. https://gist.github.com/s093294/253954c11ca3a48859fb

not much changed from original code of cesium.

7

Here is a code snippet that can be copy pasted into sandcastle to show the issue also.

https://gist.github.com/s093294/8ee1afd8253ba8f30b48

8

Hi Poul,

Can you please share the code once again? I am also trying to make it through web mercator tiling scheme. That will help me to strengthen my ideology.

Regards,
Tushar

9

Hi Poul ,

Can you schare your code again? I want to create a tiling scheme for EPSG:2056