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HDF-EOS Workshop IV September 19, 2000
MODIS Reprojection Toolpresented by
John M. Weiss, Ph.D.
Department of Mathematics and Computer Science
South Dakota School of Mines and Technology
IntroductionMODIS instrument launched recentlyMODIS 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)
Functional Requirements Ingest data in ISIN projection from HDF-EOS or
multi-file (raw binary) formatsTransform data to nine standard projectionsAllow spectral and spatial subsettingAllow three resampling optionsProduce data products in HDF-EOS, GeoTIFF,
or multi-file formatsExecution via user-friendly GUI or command
lineSupport for UNIX and Windows platforms
Major Software ComponentsGUI (Tcl/Tk or Java)ResamplerGCTP (modified to support ISIN projection)GeoLibHDF-EOS and HDF librariesGeoTIFF and TIFF librariesMulti-file I/O CodeParameter File I/O Code
Modules and Data
GUI
InputMetadata
File
ParameterFile
InputDataFile
UserInput
File InputLibraries:HDF-EOSMulti-file
Resampler
GeoLib
GCTPwith ISIN
OutputDataFile
OutputMetadata
File
File OutputLibraries:HDF-EOSGeoTiff
Multi-file
Accomplishments
Resampler processes 2-D gridded MODIS data products (Level-3)
Handles multi-file, HDF-EOS, and GeoTiff file formats
Supports all required map projectionsSupports nearest neighbor, bilinear,
and cubic resamplingSupports output pixel size
specification
Accomplishments (cont.)
Resampler supports scripting with various command-line options
Logs output to log fileRuns on all target platforms
(Windows, Linux, Sun and SGI)GUI (originally Tcl/Tk, now Java) runs
on all target platforms
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.
To Do
ISIN-specific resampling calculationsSupport for swath data
(Level-1/Level-2)Support for 3-D and 4-D data setsTestingDocumentation
TestingTesting 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
Future enhancements
Efficiency improvements: process selected bands in parallel
Concurrent/distributed processingRemote processingIncorporate HDF-EOS viewer, allowing
graphical subsettingGeneralize MODIS Tool to process other
data formats and map projections