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HDF-EOS Workshop IV September 19, 2000 MODIS Reprojection Tool

HDF-EOS Workshop IV September 19, 2000 MODIS Reprojection Tool. presented by John M. Weiss, Ph.D. Department of Mathematics and Computer Science South Dakota School of Mines and Technology. Introduction. MODIS instrument launched recently MODIS data:

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HDF-EOS Workshop IV September 19, 2000 MODIS Reprojection Tool

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  1. HDF-EOS Workshop IV September 19, 2000MODIS Reprojection Tool presented by John M. Weiss, Ph.D. Department of Mathematics and Computer Science South Dakota School of Mines and Technology

  2. Introduction • MODIS instrument launched recently • MODIS data: • Integerized Sinusoidal (ISIN) map projection • HDF-EOS file format • MODIS Reprojection Tool software: • ISIN-modified GCTP • Support for standard map projections • Support for standard file formats • User-friendly graphical user interface (GUI)

  3. Ingest data in ISIN projection from HDF-EOS or multi-file (raw binary) formats Transform data to nine standard projections Allow spectral and spatial subsetting Allow three resampling options Produce data products in HDF-EOS, GeoTIFF, or multi-file formats Execution via user-friendly GUI or command line Support for UNIX and Windows platforms Functional Requirements

  4. Major Software Components • GUI (Tcl/Tk or Java) • Resampler • GCTP (modified to support ISIN projection) • GeoLib • HDF-EOS and HDF libraries • GeoTIFF and TIFF libraries • Multi-file I/O Code • Parameter File I/O Code

  5. Parameter File GUI User Input Resampler File Output Libraries: HDF-EOS GeoTiff Multi-file Output Data File GeoLib Output Metadata File File Input Libraries: HDF-EOS Multi-file Input Metadata File GCTP with ISIN Input Data File Modules and Data

  6. Accomplishments • Resampler processes 2-D gridded MODIS data products (Level-3) • Handles multi-file, HDF-EOS, and GeoTiff file formats • Supports all required map projections • Supports nearest neighbor, bilinear, and cubic resampling • Supports output pixel size specification

  7. Accomplishments (cont.) • Resampler supports scripting with various command-line options • Logs output to log file • Runs on all target platforms (Windows, Linux, Sun and SGI) • GUI (originally Tcl/Tk, now Java) runs on all target platforms

  8. HDF-EOS Issues • Well-designed file format for MODIS data, much functionality in library routines • Documentation not always clear and accurate, fair amount of trial-and-error • HDF-EOS vs. HDF issues: • Metadata • Background fill values, valid range, etc.

  9. To Do • ISIN-specific resampling calculations • Support for swath data (Level-1/Level-2) • Support for 3-D and 4-D data sets • Testing • Documentation

  10. Testing • Testing challenge: • 9 projections • 8 data types • 4 platforms • 2 input file formats • 3 output file formats • 3 resampling types • spectral subsetting (36 Level-1 bands alone) • spatial subsetting

  11. Future enhancements • Efficiency improvements: process selected bands in parallel • Concurrent/distributed processing • Remote processing • Incorporate HDF-EOS viewer, allowing graphical subsetting • Generalize MODIS Tool to process other data formats and map projections

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