IDL_problems

IDL_problems - ATOC/ASEN 5235 IDL Problems Unless otherwise...

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ATOC/ASEN 5235 IDL Problems Unless otherwise stated, turning in your code with your plots is optional. If you do turn in the code, I will attempt to give coding suggestions if there are obvious deficiencies in your plots. 1. Due Thursday, 2 September. Write an IDL code to plot a line with y-intercept of +2 and slope of -3.5. Your plot should have the following characteristics: Horizontal axis should range exactly from -10 to 10. Vertical axis should range exactly from -40 to 40. Labels on each axis. Title at the top. Large characters. Thick lines for the line and for the axes. Somewhere near the line add the text “This is a line”. Please include your code as well as your plot when you turn this in. If you have never used IDL before, see the homework link on the web page for some IDL resources. Also, feel free to contact me for extra help. If you print your plots to a postscript file (I usually do, using the set_plot, ‘ps’ command), you will likely find it valuable to download ghostview software from http://pages.cs.wisc.edu/~ghost/gsview/ . This will allow you to view your postscript file – you can then simply copy/paste your plots into other files such as Word documents or Powerpoint presentations. For reference, this is an example of what your plot should look like:
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2. Due Tuesday, 28 September. Two IDL “save” files are available on the class web site. These files have data from the Polar Ozone and Aerosol Measurement (POAM) III satellite instrument. The file cat_poam3_v4.0.2000 contains “catalog” information (often referred to as “meta data”) such as measurement times and locations. The file o3_poam3_v4.0.2000 contains ozone profiles and associated errors. There is also a readme file explaining the content of the idlsave files. Download the files, restore them in idl, and complete the following exercise using this dataset. Catalog file: http://lasp.colorado.edu/~randall/5235/homework/cat_poam3_v4.0.2000 Ozone file: http://lasp.colorado.edu/~randall/5235/homework/o3_poam3_v4.0.2000 Readme file: http://lasp.colorado.edu/~randall/5235/homework/readme_idl2.pdf (a) Plot out a time series of all of the measurement latitudes (i.e., day of year vs. latitude). Include a title for the plot as well as labels on the horizontal and vertical axes. (b) Plot out a time series of ozone mixing ratio (i.e., day of year vs. ozone in ppmv) at 20 km, including only southern hemisphere measurements that are poleward of 60S. Include a title for the plot as well as labels on the horizontal and vertical axes. Do not include any known “bad” data. This means you should not
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IDL_problems - ATOC/ASEN 5235 IDL Problems Unless otherwise...

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