View, we will move on to the topic of operations on the data.įirst, set the dimension environment to an Z, Y varying one:
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Now that you know how to select the portion of the data set to You may display as many items as you desire overlaid before youĪnother example, in this case with X and T varying (Hovmoller We haveĪlso displayed two variables, which simply overlay each other. In this case we have set the Y (latitude) and Z (level)ĭimensions to vary, so we get a vertical cross section.
For some modern computers, the display of all 5 time steps may be so fast that the animation may not be evident. We get an animation sequence, in this case through time. We now have two varying dimensions, so by default we get aĬontour plot. When we display a variable we get a line graph, in this case a Varying dimension (the other dimensions are still fixed), and This by entering two values on the set command. We have set the X dimension, or longitude, to vary. Value, in this case the value of 'hgt' at the location 90W, 40N, 500mb, Since all theĭimensions are fixed, when we display a variable we get a single Single value, we say that dimension is "fixed". In the above sequence of commands, we have set all four GrADSĭimensions to a single value.
GrADS will not draw anything to the display window, but instead prints out "Result value = 5447.17" to the command window. Output of the data) will do things with respect to the currentĭimension environment. Now you will enter commands to alter the dimension environment. Will display a lat/lon plot at the first time and at the lowest
We can display this variable by entering: One of the available variable is called ps, for surface pressure. You may want to see what is in this file, so enter: Prompt and see the results displayed in the graphics output See a prompt: ga-> You will enter GrADS commands at this In the text window (where you started grads from), you should now Need to be made the 'active' window and you will not want toĮntirely cover that window with the graphics output window. Keep in mind that you will be entering GrADS commandsįrom the window where you first started GrADS - this window will At this point a graphics output window should GrADS will prompt you with a landscape vs. If the grads executable is not in your currentĭirectory, or if it is not in your PATH somewhere, you may need to enter the The text of the sample session below is also included for your convenience. Which in the case contains 5 days of global grids that are 72 x 46Įlements in size. The data descriptor file describes the structure of the data file, This example data set is a a binary data file containing sample model output (model.dat) and data descriptor file (model.ctl), a text file that contains the necessary metadata that GrADS needs. Tutorial (A text file containing the contents of this tutorial) After downloading the tarball, unpack it with the command :Īnd you should see the following three files:
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You will need to download in order to go through This sample session takes about 30 minutes to run through. Will give you a feeling for how to use the basic capabilities of This document presents a brief tutorial for the GridĪnalysis and Display System (GrADS).
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