Lab 4 Handout - Marrella

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Click on the “Display and Close” button. The surface obs should overlay the satellite imagery. Two methods can be used to loop through a series of images. You control the loop by clicking on the buttons located to the right of the Speed and Fade slide bars in the top portion of the main display window. The buttons look like the following: 4 Stepping through the frames one at a time Clicking on the “” icon will bring up the next frame forward in time. Looping through the frames Clicking the “” will loop the frames forward in time. Clicking the “” button will loop from the beginning frame to the end frame, then loop back to the beginning frame. To stop the loop, click on the button with the square. DEFINING THE GRAPHICS AREA IN GARP To begin this lab, you defined a graphics area covering the United States. Experiment with the other graphics areas which are available from the area menu. Also, as in GEMPAK, you can zoom into an area (and redefine the graphics area) by using the mouse. This is similar to the cursor command covered in previous labs. Just create the box as if someone had already typed in the cursor command for you, and GARP will automatically change the graphics area for you. SAVING PLOTS IN GARP If you are in a time crunch (and who isn't) and you want to create simple plots in GARP for your map discussion, you will want to save the output. Once your plot (or loop) is complete, just click on file and select save. Click on apply after creating the filename, and the file will be saved in your own directory. EXITING GARP To exit GARP, click on quit from the file menu. It is not necessary to type gpend when exiting GARP.
CREATING AN ANIMATION FROM A GARP LOOP It is not too hard to convert a GARP loop into an FLI animation. Here's how: 0) As an example, create a loop of satellite imagery in GARP. 1) Click save from the file menu, just as if you were saving a plot. This time, though, click the All Frames button. 2) Give your loop a filename, but without the .gif extension. For this example, just type sat. 3) Exit GARP 4) Type ls sat* and notice that GARP automatically numbered your images and supplied the .gif extension. 5) Type file sat01.gif (for this example) and notice the image size. 6) Type ls -1 sat*.gif > sat_list This command lists in one column all files matching sat*.gif, and places the output in a file called sat_list. (The 1 is a number one). 7) Type cat sat_list to make sure the appropriate files are in your image list. If not, you'll have to gedit the sat_list file. 8) For the final step, you'll type something like: ppm2fli N g 1098x748 –fgiftopnm sat_list sat.fli where 1098x748 should be replaced with the appropriate image size. This runs the FLI conversion program, with N specifying that xanim will be able to play the loop backwards, g ###x### specifying the animation size, fgiftopnm specifying that the original images are GIFs, sat_list specifying the list of images to convert to an animation, and sat.fli specifying the name of the resulting animation. Now you can type xanim sat.fli & to view your animation. 5
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Lab 4 Handout - Marrella

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