Exporting Web Maps from Rhino for Mapbox Issue

[Siddharth Khakhar]

Hello,

I’ve been trying out the Web Maps export from Rhino to Mapbox. If I use EPSG 4326 (as used in the tutorial) everything runs smoothly. However, if I use a different EPSG the reprojection goes off to randomly placed points. Attached 2 images below for reference.

Any help would be much appreciated!

Many thanks,

Sid

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[Reinhard Koenig]

Hi Sid,
unfortunately, I connot support you with this question. We never tried this coordiates system. You may contact Ondrej, who developed this component:
https://www.linkedin.com/in/-ondrej-vesely/
best regards
Reinhard

[Siddharth Khakhar]

Hi Reinhard,

No problem!

I will get in touch with Ondrej.

Many thanks,

Sid

[Ondřej Veselý]

After a call with Siddharth we solved the issue.

For future reference, if someone has similar issue – we solved it by projecting first to EPSG:4326 (also known as WGS 84) as intermidiary step before projecting to local Hong Kong specific coordinate system.

The bug was possibly caused by floating point arithmetic error in the reprojection maths (we are using third party .NET library for this, so it’s hard to debug, but this is my guess). In general, using EPSG:4326 as a ‘home’ projection before reprojecting to anything else seems to be a good practice in these cases.

 

[Reinhard Koenig]

Hey Ondrej, many thanks for your reply!
Best regards
Reinhard

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