Introduction to Using OpenGrADS

Getting Started

1. Opening OpenGrADS:
   • On Windows: Open Command Prompt.
   • On Linux: Open Terminal.
   • Type opengrads and press Enter.
   • This opens two windows: Code window and Plot window.

Loading Geostrophic Wind Data

1. File Setup:
   • Navigate to H drive.
   • Use sdfopen command to open the NC file for geostrophic wind data.
   • Command: sdfopen H:\Wind.nc
   • Use q file to get a description of the NC file.

Variables and Grids

1. Identifying Variables:
   • The grid identifier in the dataset is grid_001.
   • Example variable: 20 degrees latitude to 120 degrees longitude.

Plotting and Sharing

1. **Basic Plotting: **

   • Use commands like sick space out to draw plots.
   • plot command can be used to redraw plots.

2. Advanced Options:

   • Use compound plotting for complex visualizations.
   • Example: da -16x out twice for specific plot manipulation.

3. **Saving Plots: **

   • Use heavily sets to save the final plotted phase.

Conclusion

• This introduction covers the basics of plotting geostrophic wind data using OpenGrADS.
• Commands and processes were demonstrated for opening files, identifying variables, plotting and saving diagrams.