Geographic coordinate system missing

Hello,

I'm currently working in a big railway project that uses a bespoke GCS.

I was following a forum post that explaining how to create a transformation. In the process the seed file "UserOverrideGeodeticTransformSeed.asc" needed to be altered.

The heading of the file contain the following text:

"# In case of absolute necessity it is possible to override the list or
# order of the grid shift files for a specific datum transformation.
# This should only be done if no other solution is available.
# Bentley Systems would be glad to introduce new files directly
# referenced by the built-in system dictionary as part of a refresh to
# its software. Contact Bentley system through the normal support channel."

As you can imagine this new GCS is a big headache with all the legacy data.

Is there anyone in the position to help?

Thank you in advance for your time.

Regards,

Eurico

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  • I'm currently working in a big railway project that uses a bespoke GCS

    Which version (e.g. v10.x.y.z) of MicroStation are you using?

    As you can imagine this new GCS is a big headache

    Who created that GCS?  Someone in your organisation or Bentley Systems?  

    Why is it a headache?  What is the issue with legacy data?

     
    Regards, Jon Summers
    LA Solutions

  • You'll want to know what coordinate system the legacy data is in. Often this will be the current state plane or similar.

    This a typical scenario of a site in the states, your needs may be different:

    Make a backup copy. Open the file, attach the correct system. Microstation will ask if the existing elements need re-drawn, this can be tricky, often MS thinks the old data is international feet and wants to convert to US survey feet. So say no. You should now have a georeferenced file with the elements in the correct position. Since you say it's a large site, you can do a confidence check with GIS data or even a good georeferenced aerial.

    A similar technique can be used by referencing the legacy data.

    Connect r17 10.17.2.61 self-employed-Unpaid Beta tester for Bentley

  • This a typical scenario of a site in the states, your needs may be different

    The OP could be a little clearer on the details of his GCS and the legacy data.  From the available evidence, I believe that he is working on the HS2 project in the UK.  If I've guessed correctly, then the overall GCS is the UK national grid, but he may be using a set of localised high-resolution grids provided by SnakeGrid.  He'll be working in metric units.

     
    Regards, Jon Summers
    LA Solutions

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