science data processing workshop, greenbelt, md. february 28, 2002 misr products and tools...
TRANSCRIPT
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Science Data Processing Workshop, Greenbelt, MD.February 28, 2002
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MISR Products and Tools
“Life of an HDF-EOS Science Data Product.
A gritty, behind-the-scenes exclusive!”
Brian Rheingans and Kyle Miller
MISR Instrument Team
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MISR, EOS-Terra Instrument
Multi-angle Imaging Spectro-Radiometer9 cameras, 4 spectral channels, pushbroom CCD.Continuous daylight swath acquisition.150 TB of HDF at the Langley DAAC.~50 product types, hundreds of fields.
http://www-misr.jpl.nasa.gov
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Multi-angle Concept
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You Are Here
Only3% of theLength ofOne MISRSwath shown
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MISR Swath
400 km swath width.Several product types > 2GB uncompressed.HUGE extent of latitude/longitude.Stringent science constraints on distortion and geolocation.Ambitious algorithms.Stringent size, and computing restraints.HDF-EOS on HDF4
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HDF-EOS Stacked-Block Grid
180 blocks per path; fixed locations.Same-size, rectangular in SOM.Each block is compressed as a separate chunk.HDF-EOS Grid meta describes top block.Other blocks offset to follow ground track; part of MISR-unique ext. of HDF-EOS.Foundation of 2 mil. Lines of science code
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HDF-EOS File vs. Aligned Image
sample
Red Channel Grid SDS (180 Stacked Blocks)
-SOM coordinates of top-block corners part of Grid metadata.
-Projection and orbital parameters part of Grid Metadata
-Offsets of each block from the one above part ofStacked-block grid extension metadata.
SOM X: 10,000,000 m Y: 450,000 m ( path-specific)
Blockdimension
Sample dim
Line dim
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Where does this pixel belong?
Lat/Lon not stored in product.In the SDS pixel = (block, line, sample)
Conversion <-> SOM <-> Lat/Lon require:• Several different metadata reads.• Custom code to do some offset arithmetic.• HDF-EOS grid api and use of the GCTP map proj. lib.• Lots of Patience.
Described in the MISR Data Product Specification, Appendix A.Or BIG ancillary dataset, OR Tools!
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Mapping Data Users to Tools
Use only MISR-specific GUI tools:• If you are a MISR-centric scientist with nearly zero
tolerance for anything digital.• If you are a curious individual who want to fiddle with
MISR data or learn about MISR file structure.
Also use geotiff converters:• If you analyze a lot of MISR data.• If you like Photoshop, GIS tools and reprojections.• If you want to co-locate MISR images with other data.
Also use custom GIS converters:• If you want to do serious data analysis involving MISR
science data values (vs images) and other data in a GIS environment.
Also use DPS doc and stacked-block grid api• If you must read lots of MISR data into your custom
software and you possess some programming savvy • If you are a Tool Writer/Vendor.
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Path/Orbit-based Web Browse Tool
See images beforeOrdering them.
Explore path, orbitAnd geographicCoverage.
Browse imagesAre jpg and aren’tFull resolution.
http://eosweb.larc.nasa.gov
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How can I get at MISR Metadata easily?
• Displays HDF-EOS structures and all metadata easily.• Allows minor editing of the HDF-EOS file.• Performs some statistics on the data.• Can only visualize single un-assembled blocks.
FORTRAN GUTSTcl-Tk GUI
USERS:
Beginner whoWants to learn aboutMISR file structure.
Expert when chasingA problem.
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Hdfscan – Main Menu
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Hdfscan Image with Histogram
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MISRView
• Maps path/orbit to time and date• Assembles multiple MISR blocks• Reports Lat/Lon via static lookup table.• Displays true color MISR imagery• Can reproject MISR imagery
• Perspective tool• Band slider tool• Scroll tool• Vector overlay tool
REQUIRES IDL !!!USER:
MISR-CENTRICSCIENCE DATAANALYST
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MISRView – Main Menu
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MISRView – L1B2 Radiance Data
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MISRView – MISR Vision (R-Ba, G-An, B-Bf)
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ERDAS Imagine 8.5
Custom import routines to convert MISR HDF-EOS files into Imagine files preserving geolocation via projection parameters.
SGI Irix utilities for most MISR Grid and some MISR Swath files.
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Imagine – Full Swath/Full Res. Geo-linked
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ERDAS Imagine – Raster/Vector Overlay
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ERDAS Imagine – GIS Data Analysis
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ERDAS Imagine – Mount EntaPerspective DEM Overlay
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L1B2_to_geotiff Conversion Tool
Convert MISR imagery into generic format readable by any preferred GIS tool:
tiff / geotiff format
Preserve geolocation / projection information
Reproject to any GCTP-supported projection
Facilitate subset and mosaic procedures.
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L1B2_to_geotiff – Ross Ice ShelfSOM Path 51 Oribt 5089
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L1B2_to_geotiff – Ross Ice ShelfSOM Path 50 Oribt 5220
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L1B2_to_geotiff – Ross Ice ShelfPolar Stereographic Path 51 Oribt 5089
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L1B2_to_geotiff – Ross Ice ShelfPolar Stereographic Path 50 Oribt 5220
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L1B2_to_geotiff – Pine Island Glacier Time Series
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Lambert Conformal Conic
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Science Data Processing Workshop, Greenbelt, MD.February 28, 2002
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Interrupted Goode Homolosine
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US/Mexico Geographic MosaicCourtesy Jim Knighton, JPL
Multiple MISRSwaths wereReprojected withL1B2_to_geotiffPrior to customMosaic, cloudRemoval andEqualizations.