The spectrum
Download MODO - Modtran for Remote Sensing Applications. MODO is a graphical front-end to the original Modtran radiative transfer code.
- MODTRAN Infrared Light in the Atmosphere. About this model. Model Input: Locality: Model Output: Spectrum expanded 5-11-17, changing the IR out value.
- MODTRAN® is a powerful program capable of describing atmospheric absorption, scattering, and emission paths, but it has a complicated computer-card input structure; a custom user interface, PcModWin©, was introduced to minimize setup and error-mitigation issues.
You can modify the greenhouse gases and weather, and seehow it effects the outgoing infrared energy spectrum. The totalinfrared energy flux leaving the planet is labeled Upward IR HeatFlux. The model does not compute global warming, that is, itdoesn't change the Earth temperature in response to changes in theatmosphere. However, you can alter the temperature of the ground andatmosphere yourself to compensate for a change in IR energy flux
The greenhouse gases CO2, methane,and tropospheric ozone can be set by entering concentrations aslabeled. Stratospheric ozone andwater vapor are scaled by the number in the box (where a valueof 1 would take the default value with no change).
Ground Temperature Offset changes the temperature of the groundand the overlying atmosphere by the amount you specify. The changeimposed in the atmosphere is not very realistic but gives thefirst-order behavior, by simply decreasing as much as the groundtemperature up to an altitude of 10 km. You can see a atmosphericprofiles of temperature, water vapor, and ozoneby selecting the options underneath the profile plot.
If you alter the atmospheric temperature you raise the question of whatto do with the water vapor. The options appear when T offset is not equal to 0 of Holding Fixed Vapor Pressure (absolute number of vapor molecules)or Holding Fixed Relative Humidity (scaling the vapor pressure by the change in equilibrium vapor pressure as you changed the temperature).
There are several standard atmospheric settings, and standardcloud settings. The Altitude (km) refers to the virtual sensor; if youset this to zero you will see the ground with no atmospheric interference,and if you set it Looking Up you will see the sky by IR.
You can compare two model runs by running the first, thenselecting Save This Run to Background. The run will be saved on theplot, and you can superimpose a second by changing model options. Get ridof the backround plot by Deleting it. The default way to plot the spectra are by wavenumber, but you can also view it by wavelength on either linear or log axis. The intensity plotted on the y-axis is an energy flow integrated between two values on the x axis. The different ways of tabulating the light frequencies are nonlinear, soit's as if the plot were being squished around horizontally, squeezing together in some regions and stretching apart in others as you change theplot type. The intensity, representing the area in that integral, gets higher where the plot is geting squeezed, and lower where it is stretched.
Modtran for Remote Sensing Applications
What's new in MODO 5.1:
- Updated for use with MODTRAN 5.3
Modtran University Of Chicago
Read the full changelog
MODO is a graphical front-end to the original Modtran radiative transfer code. It has been created to ease the modelling of the at-sensor radiance for hyperspectral sensors but also for generic radiometric simulation tasks.
Give MODO a try to see how useful it can be for you!
System requirements
- screen size at least 1024x768, and
- disk storage: approx. 100 MB
Download Modra
Limitations in the unregistered version
- 30 days trial
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add to watchlistsend us an updateDownload Modra1n
- runs on:
- Windows All
- file size:
- 28 MB
- filename:
- modo_v51.zip
- main category:
- Science / CAD
- developer:
- visit homepage
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