The AIRS utility package includes scripts that can be run independently, or as part of the main processing script which calls the collocation, cloud mask and retrieval software in a processing chain. MODIS geolocation and cloud mask files are required as part of this processing. NOTE: This collocation will work only for Direct Broadcast full MODIS passes ONLY. It will not work correctly on standard DAAC 5 minute MODIS granules.
Several changes have been made to the UW AIRS single FOV regression retrieval. It is now valid under all-sky (clear and cloudy) conditions. Regression coefficients have been calculated using the latest version of the SARTA forward model (v1.07 as of Jan 2008, see http://asl.umbc.edu/pub/packages/sarta.html). Surface emissivities are retrieved as 6 emissivity eigenvector coefficients, and then converted to full spectrum (2378 AIRS channels). This is done under clear-skies only. Cloud top pressure (ctp) is now retrieved. Quality flags based on retrieved cloud optical thickness (cot) are now provided as well. The quality flag is a measure of cloudiness, and therefore at the same time a measure of the reliability of the retrieval results. Possible values are:
More information is provided in the release README file that is included with the package. To download the software, please select the DOWNLOAD NOW link below.