v4.0.3 includes:       ( Terra Forward: ~04.Nov.2002       Aqua Forward: ~04.Nov.2002 )

Changes to High Resolution Daily Product Only   (product not publicly distributed)

v4.0.2 includes:       ( Terra Forward: Changes promoted in v4.0.3       Aqua Forward: Changes promoted in v4.0.3 )

• Daily Global (v4.0.2)
  • Remove Cloud Top QA-Related SDS's and Attributes. Updated the CDL file spec and HDF template file by removing the QA attributes and SDS's from all Cloud Top parameters (derived from MOD06_CT). This was done to rectify an error in the MOD06_L2 product where all clear pixels are assigned a QA value of 0 (bad) instead of the intended value of 3 (very good). Moreover, if all QA values were in fact set to 3 as desired, QA weighted statistics would render the same results as unweighted statistics, providing no added value.
  • Remove Cirrus Reflectance Pixel Counts SDS. Dropped the Pixel_Counts SDS for Cirrus Reflectance, which was found to be unnecessary.
  • Cloud Optical Thickness Log Statistics - Local Attribute Tweaks. Corrected the CDL file spec and HDF template file by changing the 'longname' local attribute of all Log SDS's from 'log of statistic' to 'statistic of log'. For example: "Log of Mean" was corrected to "Mean of Common Logarithm". Finally optimized the scale factor, added the necessary offset, and corrected the valid range for all log statitics. Note that the only parameter that is specified to compute and store log statistics is Cloud_Optical_Thickness.
• 5^o Latitude Tile (v4.0.3)
  • Histogram and Confidence Histogram Computation Correction.
    • Properly set histogram bin counts for grid cells containing only L2 fill values to the L3 fill value. Previously these had all been set to 0.
    • Corrected the implementation of category aggregation for the confidence histogram. Previously the code did not properly separate L2 pixels into aggregation categories (for confidence histogram only) as intended.
    • Properly screened L2 fill values from the total counts (index position 4) of the confidence histogram. Previously L2 fill values were tallied along with valid observations into the Confidence Histogram total counts.
    • Implemented new QA handling logic so that the code can discriminate L2 fill values from "no confidence" quality data (both have QA set to 0). The algorithm counts the latter, but not former, in the confidence histogram total counts by checking the associated L2 data for fill values.
• 5^o Latitude Tile (v4.0.2)
  • New QA Weighting Scheme. A new QA weighting function was introduced in ComputeStatistics. The QA definition was slightly altered. Now QA=0 could mean:
    1. a fill (missing) L2 pixel or
    2. a L2 pixel (likely in the valid data range) in which there is near zero confidence
    In the first case, the L2 pixel (which is a fill value) is NOT included in any statistical computation. In the second case, the L2 pixel WILL BE included in the regular statistics, regular log statistics, histograms, joint histograms, pixel counts, regressions etc. but will be NOT included in any statistic that is QA weighted (These are noted by a "QA" in the SDS name at L3 ... for example QA_Mean, etc.). Note that the ONLY L3 statistics which are QA weighted are the simple and log statistics.
  • Cloud Optical Thickness Log Statistics - Common Log Replaces Natural Log. A bug in the code relating to the computation of the Logarithmic statistics was corrected. Note that the only parameter that is specified to compute and store log statistics is Cloud_Optical_Thickness. Previously all log statistics were computed using the natural log (base e) function. This has now been corrected to be computed using the common log (base 10) function.
  • Bug Fix - Real Histograms For No QA Parameters. Modified the subroutine ComputeRealHistogram, adding a branch to handle a real histogram when no QA is passed. Needed for several MOD04 parameters. Previously these 'no QA' histograms were all unpopulated.

v4.0.0 includes:       ( Terra Forward: Changes promoted in v4.0.3       Aqua Forward: Changes promoted in v4.0.1 )

• Daily Global (v4.0.0)
  • Initial Collection 004 Delivery. Initial Version 4 S/W delivery of the Atmosphere Level 3 1-Degree Daily Global processing code. The S/W is designed for use on both Terra and Aqua data streams with Terra products (MOD08_D3) directed into ECS data "Collection 4" and Aqua products (MYD08_D3) into "Collection 3".

v3.1.1 includes:       ( Terra Forward: ~01.Aug.2002       Aqua Forward: Changes promoted in v4.0.1 )

• Daily Global (v3.1.1)
  • SDS Parameter Changes. The following changes were made to the HDF data file.
    For aerosol-derived parameters:
    • All joint histograms derived from the aerosol product were dropped (found to be unnecessary)
    • Clarified the multiple dimensions of the SDS Optical Depth Ratio Small Ocean in the long_name local attribute
    For cloud-derived parameters:
    • All contrail-related SDS's were dropped (due to poor performance)
    • Corrected long_name on Cirrus and High Cloud Fraction parameters
    • Clarified the multiple dimensions of the SDS Cloud Phase Infrared in the long_name
    • Added Cloud Top Pressure vs Cloud Effective Emissivity joint histograms
    • Modified the scale factor and valid ranges on all COT and CER parameters to keep more decimal places
    • Corrected error in specification in Cloud Top Temperature and Cloud Effective Emissivity joint histograms (binning with the Day+Night product was changed to Day only to match the MOD06_OD cloud parameters)
    • Modified the local attribute "Aggregation_Valid_Category_Values" for all MOD06_OD cloud parameters (dropping Mixed Phase as a valid category)
    • Dropped all Mixed Phase parameters, however a mixed phase for Cloud Fraction SWIR was added.
    For profile-derived parameters:
    • All K_Index SDS's were dropped (due to poor performance)
    • Retrieved Temperature Profile SDS's were added
    For all parameters:
    • Modified the scale factor for all fraction statistics to keep more decimal places and prevent small fractions from being truncated to 0%

v3.1.0 includes:       ( Terra Forward: ~01.Apr.2002)

• Daily Global (v3.1.0)
  • Cloud Top Temperature - Histogram Bin Boundary Change. Cloud_Top_Temperature histogram and joint histogram bin boundaries were modified to provide more detail.
  • Aerosol SDS Changes. A number of additions, deletions and modifications to the aerosol parameters were made. Note that this updated production software is no longer compatible with older versions of the L2 aerosol product, which evolved simultaneously and prompted changes throughout the L3 processing chain.

v3.0.2 includes:       ( Terra Forward: ~01.Oct.2001)

• Daily Global (v3.0.2)
  • Port to Linux. MOD_PR08D was ported to a Linux platform via changes in the compile script only. If the environment variable BRAND is set to "sgi32" or "sgi64", IRIX compilation is indicated. BRAND set to to "linux" denotes Linux compilation.

v3.0.1 includes:       ( Terra Forward: ~01.Jul.2001)

• Daily Global (v3.0.1)
  • Redefinition Of Histogram and Joint Histogram Bin Boundaries. The Atmosphere L3 Daily product specification was changed by redefining bin boundary definitions for a number of Histogram and Joint Histogram parameters.

v3.0.0 includes:       ( Terra Forward: ~15.Jun.2001)

• Daily Global (v3.0.0)
  • First MODIS Consistent Year Process. MOD_PR08D is promoted to run in MODIS "Consistent Year" processing. ECS metadata changes direct the 1-Degree Atmosphere Level 3 Gridded Daily product (MOD08_D3) to MODIS Data Collection 003, and comply with recent refinements in MODIS metadata standards.