International MODIS/AIRS Processing Package

IMAPP Release History

PLEASE NOTE: MODIS Direct Broadcast Level 1 software is now provided by the SeaDAS Team. The MODIS Level 1 software described on this Release History page is provided only as an archive.

September 3, 2014    (MODIS L1B GeoTIFF Reprojection Software Version 1.2)

  • Update to the software that enables users to create reprojected MODIS L1B GeoTIFF files as well as 24 bit True Color GeoTIFF files, in a selection of projections or grids to use for the remapping, for entire swaths of data or covering a user defined region. This version includes a bug fix that caused problems with 250m MODIS file interpolations when using geolocation files that contain missing values.

August 8, 2014    (MODIS Level 2 Product Software Update Version 3.0)

  • Update to the IMAPP MODIS Level 2 product generation package that includes the MODIS atmosphere products. This update includes major changes including the inclusion of NASA baselined Collect 6 atmosphere software, which will create products identical in format (including metadata) as the official archived HDF4 product files.

May 20, 2014    (AIRS, CrIS and IASI Stratospheric Ozone Intrusion Air Quality Forecast Software Version 1.0)

  • First release of a Hyperspectral Sounder Stratospheric Ozone Intrusion IDEA-I air quality forecast tool that uses a trajectory model to forecast the movement of high concentration ozone regions in three dimensions over a 48 hour period. The package includes PHP software that can display the output set of trajectory forecast images as a Web Browser animation.

April 29, 2014    (AIRS, CrIS and IASI Dual Regression Retrieval Software Version 1.3)

  • Update to the software package that uses input Aqua AIRS, Suomi NPP CrIS or MetOP IASI radiances and retrieves vertical profiles of temperature, moisture, ozone as well as cloud and surface properties at single field-of-view resolution. This software package update includes improvements in distinguishing clear sky from low cloud. This software is being co-released with the Community Satellite Processing Package (CSPP).

April 22, 2014    (MODIS GeoTIFF Web Mapping Service (MWS) Display Package Version 1.0)

  • First release of a software package that provides users with the capability to display and share GeoTIFF products through a web browser in a Google Maps interface. It is designed specifically for display of MODIS and VIIRS default GeoTIFF files created by the Polar2Grid reprojection software package. It is distributed in the form of a virtual machine (VM).

March 19, 2014    (Aqua and Terra HYDRA2 Multispectral Data Analysis Toolkit Version 1.0)

  • First release of a visualization and analysis toolkit for interrogating NASA EOS Aqua and Terra and JPSS S-NPP instrument data. This toolkit was developed to assist research and development of remote sensing applications as well as education and training of remote sensing scientists.

January 30, 2014    (MODIS Aerosol Air Quality Forecast Software Version 1.1)

  • Update to the release of the MODIS Aerosol IDEA-I air quality forecast tool that uses a trajectory model to forecast the movement of aerosols over a 48 hour period. Updates include the improvement in efficiency of the trajectory model and new PHP software that can display the output set of forecast images in a Web Browser animation. This version can also use either Collect 5 or Collect 6 MODIS aerosol and cloud products as input.

October 18, 2013    (MODIS L1B GeoTIFF Reprojection Software Version 1.1)

  • First IMAPP software release that enables users to create reprojected MODIS L1B GeoTIFF files as well as 24 bit True Color GeoTIFF files, in a selection of projections or grids to use for the remapping, for entire swaths of data or covering a user defined region.

September 24, 2013    (AIRS, CrIS and IASI Dual Regression Retrieval Software Version 1.2)

  • Update to the software package that uses input Aqua AIRS, Suomi NPP CrIS or MetOP IASI radiances and retrieves vertical profiles of temperature, moisture, ozone as well as cloud and surface properties at single field-of-view resolution. This update includes new instrument coefficient files, as well as a bug fix for surface emissivity over the oceans. This software is being co-released with the Community Satellite Processing Package (CSPP).

April 29, 2013    (AIRS, CrIS and IASI Dual Regression Retrieval Software Version 1.1)

  • Update to the software package that uses input Aqua AIRS, Suomi NPP CrIS or MetOP IASI radiances and retrieves vertical profiles of temperature, moisture, ozone as well as cloud and surface properties at single field-of-view resolution. The dual regression technique was developed at the University of Wisconsin-Madison. This software is being co-released with the Community Satellite Processing Package (CSPP).

December 10, 2012    (MODIS Aviation Weather Forecast Software Version 1.0)

  • First release of software that identifies potential aviation hazards from overshooting convective thunderstorm tops. The software uses input MODIS Level 1B 1km files to produce an output HDF4 file that contains the locations of the overshooting tops as well as images that display the areal coverage of the potential hazards that surround them.

November 26, 2012    (AIRS, CrIS and IASI Dual Regression Retrieval Software Version 1.0)

  • First release of a core software package that uses input Aqua AIRS, Suomi NPP CrIS or MetOP IASI radiances and retrieves vertical profiles of temperature, moisture, ozone as well as cloud and surface properties at single field-of-view resolution. The dual regression technique was developed at the University of Wisconsin-Madison. This software is being co-released with the Community Satellite Processing Package (CSPP).

June 5, 2012    (MODIS Air Quality Forecast Software Version 1.0)

  • First release of Infusing satellite Data into Environmental Applications - International (IDEA-I), an air quality forecast tool that uses a trajectory model to forecast the movement of aerosols over a 48 hour period. This package is globally configurable to a user defined domain, and includes PHP software that can display the output set of forecast images in a web page animation.

February 23, 2012    (Updated UWAIRS Retrieval Package 3.0 Coefficient Files and Emissivity File)

February 14, 2012    (MODIS Level 2 Product Software Update Version 2.2)

  • Update to the IMAPP MODIS Level 2 product generation package that includes the MODIS atmosphere products. This update adds additional polar 1 km product retrieval software for high latitude overpasses. The updated packaged also includes updated ancillary data acquisition scripts which now use the unix 'wget' command that allows users to more easily acquire data even if they use proxy servers.

November 3, 2011    (AIRS Single FOV Retrieval Version 3.0)

  • Stand alone package using a new dual regression technique to create single AIRS pixel resolution vertical profiles of temperature, moisture and ozone retrievals along with total ozone, precipitable water, stability indices, surface emissivity, cloud top properties and more, using input direct broadcast or archived AIRS L1B radiance files. This software package was created at the University of Wisconsin-Madison. For more information, please see the IMAPP AIRS Retrieval Version 3.0 page.

August 16, 2011    (MODIS Infrared Band Destriping Version 1.1 Release)

  • Update to the coefficient files and main run script that are part of the software package to remove artificial striping in the infrared data due to noise and mirror side differences. For more information, please see the IMAPP Destriping Version 1.1 page.

May 13, 2011    (IMAPP Virtual Appliance Version 1.1 Release)

  • Updated release of a stand-alone processing system for MODIS, AIRS and AMSR-E data. For more information, please see the IMAPP Virtual Appliance v1.1 page.

May 13, 2011    (MODIS Land Surface Reflectance Software Package)

  • Release of a MODIS package for direct broadcast that retrieves an estimate of the surface spectral reflectance in the absence of atmospheric scattering or absorption. The MOD09 algorithm is the same as that used for global MODIS Collection 5 processing at NASA GSFC. For more information, see the IMAPP Surface Reflectance page.

August 24, 2010    (AIRS L1B HDFEOS to BUFR Software Utility v1.2 Release)

  • Update to the software utility pacakge written by Nigel Atkinson of the UK Met Office that converts standard HDFEOS AIRS L1B radiances into BUFR format. This update allows the user to include AMSU in the AIRS BUFR output file. For more information on the updates that are included, please see the IMAPP BUFR utility page.

June 21, 2010    (MODIS Direct Broadcast Bidirectional Reflectance Distribution Function v1.0 Release)

  • First release of a software package that takes MODIS L1B geolocation (MOD03) and L2 surface reflectance (MOD09_L2) files as input, and creates gridded L2G surface reflectance and nadir Bidirectional Reflectance Distribution Function (BRDF)-Adjusted Reflectances as output. For more information, please see the DB BRDF Version 1.0 page.

May 17, 2010    (IMAPP Virtual Appliance Version 1.0 Release)

  • First release of a stand-alone processing system for MODIS, AIRS and AMSR-E data. For more information, please see the IMAPP Virtual Appliance page.

December 16, 2009    (AIRS/MODIS Collocation, AIRS Cloud Mask and Single FOV Retrieval Package v1.1 Release)

  • Update to the University of Wisconsin-Madison software utilities package for AIRS and MODIS that will create a collocation MODIS/AIRS file, perform an AIRS cloud mask using the MODIS cloud mask, and produce single pixel AIRS retrievals of temperature, moisture, ozone and surface emissivity in all sky conditions. For more information, please see the UWAIRS Utilities Software Package Version 1.1 page.

December 7, 2009    (DB Google Earth Software Package Version 1.2 Release)

  • Update to the software package that creates 250m true color imagery from direct broadcast or NASA DAAC MODIS data that is compatible with the Google Earth geobrowser. For more information, please see the DBGE Software Package v1.2 page.

October 14, 2009    (MODIS Level 2 Product Software Update Version 2.1)

  • Update to the MODIS Level 2 product software package. The main changes include the inclusion of the cloud optical properties portion of the MOD06 product (including cloud optical depth and cloud effective radius), the atmospheric profiles product now includes an array of Retrieved Ozone Profile, and there are new optional arguments to the main execution script. For more information on these changes, please see the IMAPP MODIS_L2 v2.1 page.

September 22, 2009    (AIRS L1B HDFEOS to BUFR Software Utility v1.1 Release)

  • Update to the software utility pacakge written by Nigel Atkinson of the UK Met Office that converts standard HDFEOS AIRS L1B radiances into BUFR format. For more information on the updates that are included, please see the IMAPP BUFR utility page.

September 21, 2009    (DBCRAS Nest Numerical Weather Prediction Version 1.0 Release)

  • First release of software that creates a 48 hour NWP forecast of standard meteorological fields using a 16 km forecast model that is nested in the DBCRAS 48 km model. For more information, please see the DBCRAS Nest Software page.

March 25, 2009    (AIRS L1B HDFEOS to BUFR Software Utility v1.0 Release)

  • This package consists of software that will convert AIRS Level 1B Radiance HDFEOS files (AIRS.2009.02.06.176.L1B.AIRS_Rad.v5***.hdf) into Binary Universal Form for the Representation of meteorological data (BUFR) format. The output consists of selected channels at full spatial resolution. The software defaults to selecting the standard 324-channel set, but the user can substitute their own channel selection if you prefer.
  • This software encodes AIRS 1b files into BUFR using the same BUFR template as is used in the NOAA/NESDIS near real-time processing, (see http://www.star.nesdis.noaa.gov/smcd/spb/iosspdt/iosspdt.php).
  • This software was written by Nigel Atkinson, Met Office, Exeter, UK.

March 10, 2009    (UW-Madison AIRS Utility Plus Single FOV Retrieval Software Package for Direct Broadcast v1.0 release)

  • First release of a set of University of Wisconsin-Madison software utilities for AIRS direct broadcast that will create a collocation MODIS/AIRS file, perform an AIRS cloud mask using the MODIS cloud mask, and produce single pixel AIRS retrievals of temperature, moisture, ozone and surface emissivity in all sky conditions. For more information, please see the UWAIRS Utilities Software Package page.

January 21, 2009    (DB Google Earth Software Package Version 1.1 Release)

  • First release of software that creates 250m true color imagery from direct broadcast or NASA DAAC MODIS data that is compatible with the Google Earth geobrowser. For more information, please see the DBGE Software Package page.

December 3, 2008    (DBCRAS Numerical Weather Prediction Version 1.0 Release)

  • First release of software that creates a 72 hour NWP forecast of standard meteorological fields using a 48 km forecast model grid that is configurable to any antenna location. The model uses IMAPP MODIS Level 2 products as part of the assimilation. For more information, please see the DBCRAS Software page.

September 29, 2008 (MODIS Infrared Band Destriping Software for Direct Broadcast)

  • First release of software that removes artificial stripes that appear in the MODIS L1B 1KM infrared bands due to detector-to-detector variations and mirror side effects. This algorithm has has been shown to have a positive impact on visualization of infared bands as well as improving the following MODIS IMAPP products that use the L1B 1km file as input:
    • cloud mask
    • cloud top properties
    • cloud phase
    • atmospheric profiles
    • sea surface temperatures
    This software has been running operationally at the GSFC DAAC prior to implementation of the atmosphere group science software since 2005. This direct broadcast version of the destriping software DOES NOT destripe the fire bands 21 and 22, after it was shown to affect the direct broadcast MOD14 fire product.

  • An example comparing images of band 27 before and after destriping is available at IMAPP_Destripe_Example.pdf.
  • July 23, 2008 (AIRS/AMSU/HSB Processing Package for Direct Broadcast v5.2)

  • Second release of AIRS/AMSU/HSB package to retrieve temperature and water vapor profiles.
  • August 2, 2007    (MODIS Level 2 Product Software v2.0 Release)

    • Completely repackaged software to create MODIS Level 2 products which are now run as a series of executables called from one script. For more information, please see the MODIS Level 2 product software page.

    June 27, 2007 (AMSR-E Level 2 v1.2)  First AMSR-E Level 2 Snow Water Equivalent Software Release:

    • Source code which uses the IMAPP Level AMSR-E 1B binary files as input to generate:
      • Snow Water Equivalent (SWE) in HDF-EOS format
      • Values are stored as byte values scaled by 2 (multiply value by 2 to get SWE in mm)
      • Values are stored on a 25 km Equal-Area Scalable Earth Grid (EASE-Grid)
    • The sofware uses the AMSR-E B05 science algorithm to produce the retrievals.   For more information, please see the AMSRE_SWE_README.txt file.

    November 14, 2006( AIRS Level 2 v1.3) Update to AIRS Level 2 University of Wisconsin-Madison Single Pixel Retrieval Release:

    • Updates include:
      • New automated run scripts with the use of a dynamic ancillary data set (NCEP gdas files)
      • New regression coefficients
      • New number of channels is 1450 (only wavenumbers below 2400 cm-1 are used)
      • Surface Pressure and Surface Reflectivity will not be retrieved anymore
      • Additional predictors: surface pressure and solar zenith angles;
              i.e. these parameters need to be provided. Current Software uses NCEP
              gdas1 surface pressure and AIRS L1B solar zenith information
      • Retrieved variables below surface pressure are set to -9999

    September 06, 2006 ( AMSR-E Level 2 v1.1)  First AMSR-E Level 2 Soil Moisture Retrieval Software Release:

    • Source code which uses the IMAPP Level 1B binary files as input to generate:
      • Soil Moisture in HDF-EOS point format (2 byte integers scaled by 1000)
    • The output product is identical to the official NSIDC DAAC product in format.  Small differences in retrieved values are due to the use of L1B as input as opposed to Level 2A.  Please see the AMSRE_SM_README.txt file for more information.

    March 21, 2006 ( AIRS Level 2 v1.1) Update to AIRS Level 2 University of Wisconsin-Madison Single Pixel Retrieval Release:

    • Updates include:
      • IDL code to convert the binary file into HDF format
      • New regression coefficients based on the AIRS forward model (SARTA) from April 2005
      • Small changes to ensure that output files are written correctly on Sun platforms

    November 14, 2005 (AIRS Level 2 v1.0) First AIRS Level 2 University of Wisconsin-Madison Single Pixel Retrieval Release:

    • Source code which uses the AIRS L1B hdf file as input, and creates a binary output file at a single AIRS field of view containing:
      • Surface Pressure [hPa]
      • Surface Skin Temperature [K]
      • Atmospheric Temperature [K] at 101 pressure levels
      • Total Precipitable Water Vapor [cm]
      • Atmospheric Moisture [g/kg] at 101 pressure levels
      • Total Ozone [Dobson units]
      • Atmospheric Ozone [ppm/v] at 101 pressure levels
      • Surface Emissivity at 15 wavenumbers
      • Surface Reflectivity at 15 wavenumbers
      and a separate binary matching file containing latitude and longitude information

    • The retrieval algorithm is a statistical eigenvector regression method, using a large global (clear-sky) training set of representative profiles and surface prameters, and their associated calculated (using forward model SARTA) radiances. A set of 1688 selected "good" channels are used for the calculations. Regression coefficients for 6 classes of brightness temperatures (at 1000 cm-1), and 11 classes of scanning angles (between 0 and 49 deg) are calculated. The only dynamic user input required by the algorithm is the AIRS L1B radiance product. The major differences in the UW-Madison package are:
      • (a) the horizontal resolution is ~14 km (i.e. AIRS FOV size, with 90x135 pixels in one granule), whereas the horizontal resolution of the operational product is ~ 50 km (AMSU footprint),
      • (b) the vertical resolution is 101 pressure levels; for the operational product it is 28 pressure levels,
      • (c) the algorithm is a regression method only,
      • (d) the algorithm is applied to every AIRS FOV in the granule, regardless of cloud conditions (the products are not valid over clouds).

    September 22, 2005 ( AIRS/AMSU/HSB Processing Package for Direct Broadcast v4.0)

  • First release of AIRS/AMSU/HSB package to retrieve temperature and water vapor profiles.
  • August 30, 2005 (MODIS Level 2 Product Collect 5 Updates) Updates to MODIS Level 2 Cloud Mask, Cloud Top Properties, Atmospheric Profiles and Ancillary software packages (v1.8)

    • Represents significant improvements to the MODIS  Level 2 product algorithms consistent with MODIS collection 5 DAAC product updates.
    • Cloud Mask:
      • Improvement of cloud retrieval in sun-glint, nighttime and high latitude regimes.
      • Code now requires the GDAS and SST ancillary files as required inputs.
    • Cloud Top Properties: 
      • New 101 level forward model is now used.
      • New fast model coefficient files have been generated.
      • The numerical data month must now be used as an input argument.
      • SST files are now used as input to improve the estimation of the surface temperature over water.
    • Atmospheric Profiles:
      • Updates to the training data used to create the regression coefficients, including new profiles and better characterization of the surface.
    • Ancillary:
      • extract_ncep_gdas1.csh now extracts 54 fields out of the GDAS grib file instead of 30.  These extra fields are used by the cloud top properties software.
      • NISE files sizes are now 218 MB instead of the former 222 MB.

    July 06, 2005 (AMSR-E Level 2 Rain Rate/Rain Type ) First AMSR-E Level 2 Release:

    • The release consists of software that converts direct broadcast binary Level 1B output files into HDF-EOS formatted Rain Rate (mm/hr) and Rain Type (Convective Rain percentage) product files.
    • The software has been converted from the original DAAC software to run on direct broadcast input files. The output files are very similar to the files distributed by the NSIDC DAAC. Please see the AMSR-E Rain Rate product web page for information on the algorithm and algorithm developers.
    • This release is supported on Red Hat Linux 8.0, 9.0 and Enterprise only.

    April 25, 2005 (AMSR-E Level 1B (also known as Level 2A)) First AMSR-E Level 1Release:

    • Allows any ground station capable of receiving direct broadcast from Aqua to produce calibrated and geolocated AMSR-E Level 1B (also know as Level 2A) products.
    • This software was developed by Remote Sensing Systems (RSS). The output consists of two binary files. One contains brightness temperatures, the other geolocation, time, velocity information, etc.
    • This is a binary-only release for Red Hat Linux 7.3,8.0,9 and Enterprise and Sun Solaris (SPARC)7, 8, 9 platforms. No source code is included

    December 20, 2004 ( MODIS Level 2 v1.7) Aqua/Terra Near-Infrared Total Precipitable Water Vapor Product Release:

  • First release of MODIS near-infrared technique to retrieve total precipitable water vapor from both Aqua and Terra satellites.
  • This direct broadcast product release consists of software developed by Albert Peter of the Satellite Application Facility on Climate Monitoring, Department of Climate and Environment, Offenbach, Germany. The technique was developed by Albert Peter and is described in the document ion included in the release (modis_wvnir.pdf).
  • The output product is a flat binary file containing total precipitable water vapor at 1 km resolution in kg/m^2. IDL code is included to convert the file to HDF.
  • October 5, 2004 ( MODIS Level 2 v1.6) Aqua/Terra Aerosol Product Release:

  • First release of MODIS aerosol product software (MOD04) for both Aqua and Terra.
  • This direct broadcast aerosol release is concurrent with DAAC aerosol MOD04 operational version 4.0.1.
  • Only 6 Science Data Sets are output using this software. These are:
  • Latitude
  • Longitude
  • Optical_Depth_Land_And_Ocean - AOT at 0.55 micron for both ocean (best) and land (corrected)
  • Optical_Depth_Ratio_Small_Land_And_Ocean - Ratio of small mode optical depth at 0.55 micron
  • Corrected_Optical_Depth_Land (3 bands) - Corrected optical thickness at 0.47, 0.55, and 0.66 micron
  • Effective_Optical_Depth_Average_Ocean (7 bands) - AOT at seven bands for average solution at .47, .55, .66, .86, 1.2, 1.6 and 2.1 micron
  • New ANCILLARY.tar and FLATFILE.tar packages are included with this release and create the required input for the aerosol software.
  • March 30, 2004: Nanjing Remote Sensing Symposium June 6-12, 2004

    March 3, 2004 ( MODIS Level 2 v1.5) Aqua/Terra Sea Surface Temperature Product Release:

  • First release of MODIS Sea Surface Temperature (SST) product software compatible for both Aqua and Terra.
  • The technique used in the creation of the IMAPP SST product differs from the official DAAC MOD28 product. Please see SST_DOC.pdf for more information.
  • January 16, 2004 (MODIS Level 1 patch) Update for Terra MODIS calibration following spacecraft safe hold:

    • Following the restoration of Terra MODIS direct broadcast on 2004/01/15, we discovered a problem with the IMAPP MODIS Level-1 calibration code.
    • The primary symptom is that most of the earth view image data in the Level-1B product files will be set to "Invalid", even though the raw earth view counts are valid.
    • To fix the problem, minor patches are required to three of the IMAPP MODIS v1.4/v1.5 calibration source code files.
    • We strongly recommend that all IMAPP MODIS Level-1 users install this patch as soon as possible. Please note that Aqua MODIS data is unaffected by this problem, and the patch has no effect on the processing of Aqua MODIS.

    November 19, 2003 (MODIS True Color) New Tutorial on Producing MODIS True Color Images:

    • The tutorial describes in detail a method for creating high quality true color MODIS images using freely available software.
    • Required input data includes MODIS Level 1B 1000, 500, and 250 meter radiances, and 1000 meter geolocation.
    • Either IMAPP or DAAC format MODIS Level 1B data may be used.
    • Tutorial includes documentation, source code, and sample data.
    • Examples of MODIS true color images created using this method are available at the SSEC MODIS Gallery.
    • Created by Liam Gumley, Jacques Descloitres, and Jeffrey Schmaltz.

    November 6, 2003 (MODIS Level 1 v1.5) Update for Terra and Aqua MODIS:

    • Included in this release is an updated version of the geolocation code; an updated set of calibration lookup tables (LUTs); and an updated MODIS Level 1 master script.
    • An important feature of the new geolocation algorithm is that it resolves some recent problems (Oct/Nov 2003) which have been observed with Terra MODIS geolocation. Symptoms reported by IMAPP users in the United Kingdom, Germany, Australia, and Alaska include (a) geolocation algorithm exits prematurely, (b) geolocation data produced for Terra MODIS is incorrect. In all cases, the new version of the geolocation algorithm has fixed the problem.
    • This release contains a new set of calibration lookup tables (LUTs) for the MODIS reflected solar bands and thermal emissive bands. The new versions of the LUTs are Terra: V 4.1.2.6 (April 15, 2003); Aqua: V 4.1.3.5 (April 29, 2003). For a history of lookup table changes, please see the MCST website under the "LUTs Version" links for Terra and Aqua.
    • Note that the calibration LUTs are not identical to the current versions used at the GSFC DAAC, as they do not include the new time-dependent coefficients for the MODIS ocean bands. A new version of the IMAPP calibration algorithm is under development which includes the most recent MODIS LUTs. The time-dependent coefficients have a small effect on the calibration of the MODIS ocean bands only.

    November 5, 2003 (AIRS/AMSU/HSB Level 1 v1.0) First AIRS/AMSU/HSB Release:

    • Allows any ground station capable of receiving direct broadcast from Aqua to produce calibrated and geolocated AIRS, AMSU, and HSB Level 1B products. This package is functionally identical to the operational AIRS/AMSU/HSB Level 1B package running at the GSFC DAAC.
    • This is a binary-only release for Red Hat Intel Linux and Sun Solaris (SPARC) platforms. No source code is included.
    • The package has been tested on the following platforms: Red Hat Intel Linux: 7.3, 8.0, 9; Sun Solaris (SPARC): 7, 8, 9.

    September 18, 2003 (MODIS Level 2 v1.4) Aqua/Terra Atmospheric Profiles and Water Vapor Product Release:

  • Updated MODIS Aqua and Terra compatible atmospheric vertical profiles of temperature and moisture, and total precipitable water vapor, total column ozone and atmospheric stability software (MOD07). A "Platform Name" argument is now required to run the algorithm. Coefficients and bias corrections are chosen based upon the satellite platform name. This direct broadcast profiles release is concurrent with DAAC atmospheric profiles MOD07 operational version 4.1.0.
  • Updated the forward model codes and coefficients used in computing radiances from the training profiles with the latest version using the HITRAN2000 spectral database.
  • Bias corrections are now read in from an ascii file, instead of hardwired into the code, and a new input ascii file containing a list of the detectors to be used for each band has been created. All changes, including the improvement of surface emissivities and the handling of integration of near-surface layer precipitable water are described in detail in the HISTORY file.
  • First Aqua and Terra compatible band 26 correction. Aqua coefficients are now available and a "Platform Name" argument is now required to run the algorithm.
  • Images of the test Aqua and Terra direct broadcast data sets from 24 August 2002 are included: 

    Terra IMAPP L2 v1.4 Images Aqua IMAPP L2 v1.4 Images
    Total Precipitable Water Total Precipitable Water
    Cloud mask Cloud mask
    Band 2 Band 2
    Band 26 corrected Band 26 corrected
    Band 26 un-corrected Band 26 un-corrected

  • February 19, 2003 (MODIS Level 2 v1.3) Aqua/Terra Cloud Mask and Cloud Top Properties Release:

  • First MODIS Aqua and Terra compatible cloud mask and cloud top property release. A "Platform Name" argument is now required to run the algorithms.
  • Cloud mask retrievals have been improved over problem areas such as sun glint and nighttime land.  Cloud top retrievals use different noise thresholds based upon satellite platform.   As a result, more CO2 retrievals are expected for Aqua due to the reduced noise in the longwave IR bands.  Please see HISTORY for more information.
  • A software routine to correct for radiation from band 5 (1.2 microns) leaking into band 26 (1.38 micron) detectors is included in this release (DESTRIPE_BAND26.tar). The correction to the radiances helps when imaging band 26, and aids in the correct identification of thin cirrus in the cloud mask algorithm.
  • IDL software is included which can convert output binary flat files into a stripped down HDF file (create_fake_mod35.pro , create_fake_mod06.pro ).
  • The IMAPP Cloud Mask software is compatible with DAAC MOD35 version 4.2.0 that was delivered to the DAAC on November 2002. The IMAPP Cloud Top Properties and Cloud Phase science software is identical to the MOD06CT package v4.0.4 delivered to the DAAC in December 2002.
  • Images of the test Aqua and Terra direct broadcast data sets from 5 January 2003 are included: 

    Terra Cloud Mask Aqua Cloud Mask
    Cloud mask Cloud mask
    Band 2 Band 2
    Band 26 corrected Band 31
    Band 26 un-corrected Land Sea Bits (6 and 7)
    Snow Bit (5) Snow Bit (5)
    Day/Night Bit (3) Visible Ratio Test Bit (21)
    1.38 micron High Cloud Test bit (16)
    4-11 micron Test bit (19)


    Terra Cloud Top Properties Aqua Cloud Top Properties
    Cloud Top Pressure Cloud Top Pressure
    Cloud Phase Cloud Phase

  • October 1, 2002 (MODIS Level 2 v1.2) Atmospheric Profiles and Water Vapor Product Release:

    • Second MODIS science product release. The key parameters of this product (MODIS product MOD07) are retrievals of vertical profiles of atmospheric temperature and moisture, total column ozone, total column water vapor, stability parameters (lifted index, K index, total totals), as well as low level moisture (water vapor between surface and 700 hPa) and high level moisture (water vapor between 400 and 100 hPa).This software is equivalent to the current DAAC version 3.1.0 delivered to GSFC on 4 March 2002.

    September 13, 2002 (MODIS Level 1 v1.4) First version to support both Terra and Aqua MODIS:

    • The Terra MODIS calibration and geolocation algorithm and lookup tables are unchanged from the MODIS Level 1 v1.3 release.
    • The Aqua MODIS calibration algorithm and lookup tables are versions 3.0.1 and 3.1.0.2, respectively. This version includes post-launch calibration data acquired following the Aqua MODIS nadir door opening. It will handle all Aqua MODIS data acquired to date.
    • The Aqua MODIS geolocation algorithm requires that ephemeris and attitude files be used, since spacecraft position is not encoded in the Aqua MODIS Level 0 PDS files. For realtime processing, the GBAD data (APID 957) transmitted as part of the X-band downlink may be used in conjunction with the GSFC GBAD processor to produce IMAPP-compatible ephemeris and attitude input files. Our experience has shown that realtime geolocation using GBAD derived ephemeris and attitude data is accurate to within 500 meters. For non-realtime processing, the definitive Aqua ephemeris and attitude files (see Links below) may be used, providing the same geolocation accuracy as the operational processing at GSFC. Note that the definitive ephemeris and attitude files are usually not available for at least 24 hours.
    • The IMAPP MODIS Level 1 processing script (util/imapp.csh) has been updated to handle both Terra and Aqua data. This script combines the functionality of the level1a.csh, geolocate.csh, and calibrate.csh scripts and allows all input files to be specified on the command line. The user is responsible for identifying the satellite (Terra or Aqua).

    May 1, 2002 (MODIS Level 2 v1.1) First science product release for Terra MODIS:

    • This release includes the MODIS Cloud Mask (MOD35) and Cloud Top Properties (MOD06CT) algorithms. The release consists of an ancillary data extractor, a set of flat file radiance/geolocation extractors, the cloud mask software and the cloud top properties software. The extractors serve as data preprocessors for the science software packages. Production scripts exist as part of both the cloud mask and cloud top properties packages which will execute the extractors and product software in sequence. Please see the README files. The cloud mask software is updated to production version 3.1.1, whereas the cloud top properties and cloud phase software is updated to version 3.1.0.

    December 3, 2001 (MODIS Level 1 v1.3) Third update for Terra MODIS:

    • The calibration algorithm and lookup tables are updated to versions 3.0.0 and 3.0.0.7, respectively. This version includes calibration data for the A-side electronics on MODIS following the outage which occurred from June 15 to July 3, 2001. The calibration algorithm in IMAPP v1.3 is date sensitive, and may be used for all Terra MODIS data back to February 2000.
    • The geolocation algorithm now has improved interpolation/extrapolation of ephemeris and attitude information. This prevents bad lat/lon values toward the beginning and ending sections of a pass (originally released as a patch for IMAPP v1.2 on August 31, 2001).

    April 13, 2001 (MODIS Level 1 v1.2) Second update for Terra MODIS:

    • Calibration algorithm and lookup tables are updated to versions 2.5.5 and 2.5.5.1 respectively, which includes calibration data for the B-side electronics on MODIS (the switch to B-side electronics occurred on 1 November 2000). The calibration in IMAPP v1.2 is date sensitive, and may be used for all Terra MODIS data back to February 2000. This version also includes a bug fix for aggregation of the 250 m and 500 m spectral bands to higher spatial resolution.
    • Geolocation is significantly improved when using only the Level-0 platform ephemeris and attitude information (i.e. in near-realtime). Terrain correction is now available as an option (requires that DEM data files be installed: see the installation instructions). Definitive Terra ephemeris and attitude data are now available via FTP for input to IMAPP (see Related Links).
    • Level-1A algorithm is more resistant to Level-0 input file anomalies. Processing now terminates gracefully if a packet with an improper length is encountered in the Level-0 input file.

    November 1, 2000 (MODIS Level 1 v1.1) First update for Terra MODIS:

    • Calibration algorithm and lookup tables are updated to version 2.4.3. This includes many post-launch improvements and bug fixes from the MODIS Calibration Team at GSFC
    • Added support for definitive ephemeris and attitude data
    • Solarisx86 is now supported on Intel Pentium platforms

    May 12, 2000 (MODIS Level 1 v1.0) Initial release including the following functionality for Terra MODIS:

    • Reformatting from time-ordered CCSDS Level-0 packets to Level-1A
    • Geolocation for every 1000 m pixel
    • Calibration for every pixel in bands 1-2, 1-7, and 1-36 at 250, 500 and 1000 m resolution respectively