I have downloaded Bathymetry data from GEBCO. Its in NetCDF format. I want to create contour from it. I tried so many tools to convert the file into raster but couldn't do so. How can I create raster from netCDF?
If you have access to the 3D Analyst extension, instead of downloading NetCDF grids, you could download ASCII grids (GEBCO offers both options). You can use the ASCII 3D to Feature Class tool to create a feature layer, and then use the Spline or Krigging tools to create your bathymetric rasters.
You put the tags "arcgis-desktop" "gdal" so I assume QGIS might be an option too? Depending on the version of netcdf, you can simply load it and then use the usual Raster -> Extraction -> Contour workflow.