TAFKAA FREE DOWNLOAD

Password Forgot your password? If you have arrived on this page from an external web site and wish to view the article abstract first, click on the link below. The water-leaving radiance is assumed to be Lambertian; this excludes modeling multiple scattering effects between the water-leaving radiance and the atmosphere. Please upgrade to the latest version of Internet Explorer. Note that full-text PDFs from conferences typically contain pages of content, some or all of which might be an abstract, summary, or miscellaneous items. Right click equation to reveal menu options. Remember me on this computer.

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Hyperspectral Imaging and Sounding of the Environment If no aerosol information is available, then TAFKAA defaults to making a "black-pixel" assumption tafkaz estimating the aerosol type from wavelengths of and nm if no wavelengths greater than nm are available in the imageas previously described. Full-text PDFs of conference papers are available to OSA Publishing subscribers or through one of the purchase options mentioned on our subscription page.

To view this article you will need to login or make a payment. The disadvantage of this yafkaa is that the atmospheric conditions must be measured in the field at the time of image acquisitionor perhaps obtained from atmospheric forecast models, in order to obtain the inputs needed to compute the atmospheric path radiance for each pixel.

Equations displayed with MathJax. Other such codes exist e. You are viewing a version of the Ocean Optics Web Book site specially-formatted for printing. When using a radiative transfer code such as TAFKAA, the sun and viewing geometry for each pixel are known from the location, time, sensor altitude and heading, and pixel location in a georectified image.

Knowing the wind speed allows for a estimate of the background sky reflectance by the sea surface to be computed. As just seen, the empirical line fit technique has the virtues that it works in principle for any atmosphere and no atmospheric measurements are needed.

Ocean Optics Web Book

TAFKAA is discussed here because one of its versions is designed for the particular problems of oceanic hyperspectral remote sensing. We've also updated our Privacy Notice.

The water-leaving radiance is assumed to be Lambertian; this excludes modeling multiple scattering effects between the water-leaving radiance and the atmosphere. This website uses cookies to deliver some of our products and services as well as for analytics and to provide you a more personalized experience.

Features on this site are not supported by that browser version. These are often impossible to obtain and certainly are not practicable for routine observation of large areas.

These path radiance calculations are performed with an atmospheric radiative transfer model, usually including polarization.

Radiative Transfer Techniques • Ocean Optics Web Book

The original TAFKAA look-up table included path radiances and atmospheric transmittances for the following grid of values:. Click here tafiaa learn more. Such calculations are computationally intensive, so one set of calculations is performed for a wide range of conditions to create a look-up table of path radiances and other factors, such as atmospheric transmittances. It looks like you're using Internet Explorer 6: The original TAFKAA look-up table included path radiances and atmospheric transmittances for the following grid of values: However, it has the disadvantage that it requires field measurements of to use in developing the ELF functions.

When processing an gafkaa, the user inputs the image information location, time, aircraft or satellite altitude and heading, georectification information and atmospheric conditions.

If atmospheric conditions such as sea-level pressure; aerosol type, altitude, and optical thickness; and humidity are known, the path radiance can be computed for each path from pixel to sensor.

These calculations required many months of computer time, but they need be done hafkaa once. Please upgrade to the latest version of Internet Explorer. Right click equation to reveal menu options. Privacy Terms of Use. The ELF technique also does the same atmospheric correction for every image point, even though for airborne imaging the viewing geometry may be significantly different for different image pixels.

Level 2 Radiative Transfer Techniques. Please contact elec osa. Given the viewing geometry and atmospheric conditions for a pixel, interpolation in the look-up table is used to obtain the appropriate wavelength-dependent path radiance and surface reflectance to subtract from the at-sensor radiance or reflectance to obtain the water-leaving radiance or reflectance at the sea surface.

TAFKAA allows the user to input a file with the sensor wavelength tafkas for the different wavelength bands, tafkza that TAFKAA output matches a particular sensor's wavelength response as closely as possible. Note that full-text PDFs from conferences typically contain pages of content, some or all of which might be an abstract, summary, or miscellaneous items. Click here to tafaka what's new.