The application allows loading custom grid files for NTv2(.gsb) and Nadcon(.las/.los) coordinate transformations..

Transformation using Grid files

Some coordinate transformations (NTv2, etc.) require one or more Grid files in order to be processed. Some of the most commonly used Grid files worldwide are included in the application, but you can see that some others instruct you on where to download Grid file(s) not included with the application (usually a download URL).

When you click “Additional files are required” link, the application will show you the details of the required Grid file(s):

• Name of the grid file(s) (including the expected file name and extension)
• Information source (e.g. the organization responsible for the grid file(s) and/or the download URL)
• File path: where the file must be copied in order to be used by the application, the application will automatically use the grid file on the next run.

Use custom Grid files

On the other hand, even if the required Grid file(s) already exist (included as standard in the application, or previously downloaded by the user), the application allows the user to choose alternative Grid file(s) so that it can use more accurate or updated Grid transformations when more appropriate files are available. This custom choice for a Grid file is kept by default for a work session, but will not be saved after closing and reopening the application.