The AAPP – ATOVS (Advanced TIROS Operational Vertical Sounder) and AVHRR (Advanced High Resolution Radiometer) Processing Package – performs the end-to-end processing of Sounding and Imager Data from the HRPT (High Resolution Picture Transmission) direct readout data stream of the TIROS-N\/NOAA<\/a><\/i> satellites and also their successors of the NOAA-KLM<\/a><\/i> satellite series, from 1998 onwards. AAPP also processes data from the European METOP<\/a><\/i> satellites<\/p>\n The data of the following instruments can be processed:<\/p>\n For the NOAA satellites, AAPP performs the following tasks:<\/p>\n For METOP, AAPP ingests “EPS Level 0” files (one file per instrument), then performs navigation, calibration and pre-processing as above.<\/p>\n In the case of IASI, level 1 processing is performed by the OPS-LRS (Operational Software – Local Reception Station), which is an optional extension to AAPP and is based on the OPS software provided to EUMETSAT by CNES.<\/p>\n For NPP, the starting points for AAPP are Sensor Data Record files (SDR). For direct readout, you will need an external program, such as University of Wisconsin’s CSPP package, or NASA’s IPOPP package, to generate the SDR files. The same applies to FY-3, for which the China Meteorological Administration provide a processing package for direct readout use.<\/p>\n Supplementary Modules perform the processing of Orbital information and provide the following services:<\/p>\n In the course of the processing the following files are created for each instrument:<\/p>\n From the Navigation step the resulting files are created:<\/p>\n The output of AAPP is taken as input by level 2 processing packages that derive temperature and humidity profiles from the NOAA satellite instruments data by inverting the radiation transfer through the Earth’s atmosphere.<\/p>\nTIROS-N<\/h4>\n
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NOAA-KLM<\/h4>\n
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NOAA-NN’<\/h4>\n
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METOP<\/h4>\n
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NPP<\/h4>\n
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FY3<\/h4>\n
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Inversion Packages<\/h2>\n