PCModwin-4.0使用教程!.ppt

PC MODTRAN Tutorial How to make an atmospheric model in 47 easy steps. Find MODTRAN and start it The PcModwin 4.0 icon should be on the desktop, and you double click on it to get Configure model input data Model atmosphere parameters Select model Atmosphere-1976 U.S. Standard Select Type of Atmospheric Path - Slant Path Select Mode of Execution - Transmittance Hit Next! Atmospheric Column parameters – hit Next! Aerosols (note that we’re using Rural, with 23 km visibility) – Hit Next Geometry and Spectral Band (3) lots to do here Many path types, use default Observer height – 60 km Final Height – 0 km Zenith Angle – 180 degrees Initial Frequency 0.5 microns Final Freq 2.9 microns Next! Sanity check diagram The model parameters are reproduced here to make sure that the program is configured correctly. Model parameters at top Note diagram showing viewing geometry Run the model Select Run Model- Run Modtran Wait…. Hit any key to continue Plot that puppy. Select Plot - Interactive Select MODOUT2 Change X-axis to Micrometers, hit okay Wait for it to plot twice Now we have a plot of transmissivity in the VNIR, and you can answer the questions in lab. Oh wait, perhaps a little more direction would be helpful. First trick. Clicking on the plot will show the X and Y location you’ve clicked on the upper left corner. This is probably all you need to answer the first question. More Plotting Tricks If you’re one of those types who has to have the exact answer, you can adjust the plotting parameters as you like. Select Plot-Edit Plot For example:Autoscale: OFFMin X=1, Max X=1.1X Decimal = 2 (you might have to fiddle with X Divisions too) will yield A Beautiful Butterfly of a Plot So that you can get ridiculously exact about answering the questions in the lab. For example:Autoscale: OFFMin X=0.938, Max X=0.946X Decimal = 5 will yield the plot on the next page Still more plotting tricks There are also ways to plot one data set over another, and various other th