Sometimes I need to check bathymetric or topographic data. A good and fast way to do it is to use SURFER. XYZ data need to be gridded first. Click Grid–>Data and open the file. Select the file you want to… How to get a 2D/3D view using SURFER

In Excel, the maximum worksheet size is 1048576 rows by 16384 columns. It means that large files, typically gridded files are hard to manipulate. https://support.microsoft.com/en-us/office/excel-specifications-and-limits-1672b34d-7043-467e-8e27-269d656771c3 A possible solution is to use SURFER, particularly the worksheet. SURFER is not free and… How to manipulate large sheet files: SURFER !