Monday, May 16, 2022

Convert Geoids from BYN to GTX format with this WebApp

This WebApp came about because I wanted to use some Geoid files for some vertical datum corrections with Proj (which uses .gtx format) but could only find Geoid files in Natural Resources Canada's .byn format.

  1. To convert Geoid BYN files to GTX, open up a browser to the following url:

    The WebApp is loaded.

  2. Click the Add File button.

    The File Upload dialog appears.

  3. Browse and select a .byn file e.g. EGM96.byn. Click Open.

    The Geoid file is displayed in a list and the Convert button is enabled.
    Note: the Geoid .byn is loaded locally to the browser and not transferred to some server on the Internet.

  4. Click the Convert button.

    The Geoid file is converted into .gtx format and the Process log and Save As icons are enabled.

  5. Optional. To view the process log, click the Show Process Log icon.

    The process log messages are displayed.

  6. To save the converted .gtx Geoid locally, click the Save Converted File icon.

    The Geoid file is saved.

  7. Optional. If necessary, you can use a GIS software like QGIS to display the converted .gtx file, as shown below.


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