International MODIS/AIRS Processing Package

Requirements

    IMAPP software and test data are available from the new web download interface as well as from our FTP site (please see the Release History section). Please read the top level individual package README files for installation and run instructions. IMAPP is licensed under the terms of the GNU General Public License for all but the MODIS Level 2 imaging package which requires approval from SSEC (contact the McIDAS Help Desk) prior to any repackaging or redistribution. 

• Linux operating systems using the g77 gnu (gcc 3.2.1) compiler:
   Red Hat Linux x86 7.2, Red Hat Enterprise Linux 3 x86_64
      and Linux CentOS 4.2 x86_64 on Sun Opteron platforms

MODIS Level 2 science products require MODIS Level 1B HDF radiance and geolocation files in either direct broadcast modisl1db or GSFC/DAAC format (both formats are supported). NOTE: If you want to use the new automated scripts released with version 2.0, you must use modisl1db, not the original Level 1B IMAPP software. The L1B HDF data are extracted into flat binary files and used as input to the science product software. Some IMAPP products also require external dynamic ancillary data files as input. For example, one of the files that the cloud mask product requires is the the Near Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow Extent (NISE) dataset for optimal performance over snow covered regions. All required dynamic ancillary data sets are updated daily and are available from our ancillary data FTP site. A document describing the ancillary data files used by all IMAPP products can be viewed at: IMAPP_L2_ANCILLARY.txt.

• Red Hat Linux x86 7.2, Red Hat Enterprise Linux 3 x86_64
  
• and Red Hat Enterprise Linux 4.2 x86_64
  

This software requires either AIRS direct broadcast or DAAC L1B Radiances as input. Dynamic ancillary information on surface pressure is required, and automated software which automatically gets the numerical weather prediction GDAS1 (Global Data Assimilation System) or GFS (Global Forecast System) files that match the date and time of the AIRS input L1B files are included as part of the package. For complete information on the ancillary data required for this and all IMAPP software, please see the IMAPP_L2_ANCILLARY.txt file.

• Red Hat Linux 7.3,8.0,9 and
• Enterprise and Sun Solaris (SPARC)7, 8, 9 platforms.
  

The input expected by the package is Level 0 AMSR-E, and GBAD files, defined as reconstructed time-ordered CCSDS packets with all communication artifacts (including duplicate and bad packets) removed. This includes PN and Reed Solomon decoding as well as reassembly of the raw telemetry packets. Processing of the data stream to this stage is the responsibility of the user. Data in this format is known as a Production Data Set (PDS).
    The Direct Readout Laboratory at NASA GSFC has developed a software application named RT-STPS (Real-Time Software Telemetry Processing System), which synchronizes the data, performs PN and RS decoding and packet reassembly, and writes the output in PDS format. This package is know to be compatible with Level 0 PDS files created by RT-STPS. In addition, many X-band ground station vendors supply processing hardware and/or software that creates compatible Level 0 files.

AMSR-E Level 2 (Rain Rate, Soil Moisture and Snow Water Equivalent)
AMSR-E Level 2 software is supported on the following platforms:

• Red Hat Intel Linux 8, 9, Enterprise Linux 3 and 4 - (Rocks 3.3 and 4.2 x86_64)
  

AMSR-E Level 2 IMAPP products require IMAPP Level 1 format binary output products as input. This software will not execute using the standard AMSR-E L1B HDF product.