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HDF-EOS5 has many advantages over HDF-EOS2. Future Earth observation data products (such as Aura, NPOESS) are in HDF-EOS5 or HDF5. There is a need to find a path (or obstacles) to transition EOS products from HDF-EOS2 to HDF-EOS5. The goal is to preserve EOS data products in the long run.
MODIS 8-day level 3 global 500 m land surface reflectance product (MOD09A1) is selected to conduct this pathfinder project of HDF-EOS2 to HDF-EOS5 transition. Two methodologies are used for this study. The first approach is to directly modify HDF-EOS2 Product Generation Executable (PGE21) codes to produce HDF-EOS5 products. The second is to develop standalone converter to change HDF-EOS2 data to HDF-EOS5 data. We analyzed PGE21 data types, objects, attributes, metadata and structures and found mapping relationships between HDF-EOS2 and HDF-EOS5. While keeping the algorithm and data values the same, HDF-EOS2 codes and data types are changed to HDF-EOS5. Finally, we added an internal compression feature in PGE21 to compress HDF-EOS5 file. The standalone converter is based on heconvert program code and we added metadata and compression features.MODIS 8-day level 3 global 500 m land surface reflectance product (MOD09A1) is selected to conduct this pathfinder project of HDF-EOS2 to HDF-EOS5 transition. Two methodologies are used for this study. The first approach is to directly modify HDF-EOS2 Product Generation Executable (PGE21) codes to produce HDF-EOS5 products. The second is to develop standalone converter to change HDF-EOS2 data to HDF-EOS5 data. We analyzed PGE21 data types, objects, attributes, metadata and structures and found mapping relationships between HDF-EOS2 and HDF-EOS5. While keeping the algorithm and data values the same, HDF-EOS2 codes and data types are changed to HDF-EOS5. Finally, we added an internal compression feature in PGE21 to compress HDF-EOS5 file. The standalone converter is based on heconvert program code and we added metadata and compression features.
We evaluated the HDF-EOS5 data output from PGE21 and compared PGE21 performance for HDF-EOS2 and HDF-ESO5. Detailed results are presented in the poster.
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