1. 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

2. Introduction zMODIS instrument launched recently zMODIS data: yIntegerized Sinusoidal (ISIN) map projection yHDF-EOS file format zMODIS Reprojection Tool software: yISIN-modified GCTP ySupport for standard map projections ySupport for standard file formats yUser-friendly graphical user interface (GUI)

3. Functional Requirements zIngest data in ISIN projection from HDF-EOS or multi-file (raw binary) formats zTransform data to nine standard projections zAllow spectral and spatial subsetting zAllow three resampling options zProduce data products in HDF-EOS, GeoTIFF, or multi-file formats zExecution via user-friendly GUI or command line zSupport for UNIX and Windows platforms

4. Major Software Components zGUI (Tcl/Tk or Java) zResampler zGCTP (modified to support ISIN projection) zGeoLib zHDF-EOS and HDF libraries zGeoTIFF and TIFF libraries zMulti-file I/O Code zParameter File I/O Code

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

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

7. Accomplishments (cont.) zResampler supports scripting with various command-line options zLogs output to log file zRuns on all target platforms (Windows, Linux, Sun and SGI) zGUI (originally Tcl/Tk, now Java) runs on all target platforms

18. HDF-EOS Issues zWell-designed file format for MODIS data, much functionality in library routines zDocumentation not always clear and accurate, fair amount of trial-and-error zHDF-EOS vs. HDF issues: yMetadata yBackground fill values, valid range, etc.

19. To Do zISIN-specific resampling calculations zSupport for swath data (Level-1/Level-2) zSupport for 3-D and 4-D data sets zTesting zDocumentation

20. Testing zTesting challenge: y9 projections y8 data types y4 platforms y2 input file formats y3 output file formats y3 resampling types yspectral subsetting (36 Level-1 bands alone) yspatial subsetting

21. Future enhancements zEfficiency improvements: process selected bands in parallel zConcurrent/distributed processing zRemote processing zIncorporate HDF-EOS viewer, allowing graphical subsetting zGeneralize MODIS Tool to process other data formats and map projections