Introduction to MISR Data Analysis and Tools Linda Hunt Science Systems & Applications Inc., NASA...
Transcript of Introduction to MISR Data Analysis and Tools Linda Hunt Science Systems & Applications Inc., NASA...
![Page 1: Introduction to MISR Data Analysis and Tools Linda Hunt Science Systems & Applications Inc., NASA LaRC Brian E. Rheingans Jet Propulsion Laboratory, California.](https://reader036.fdocuments.us/reader036/viewer/2022062500/56649e635503460f94b5f1d7/html5/thumbnails/1.jpg)
Introduction to MISR Data Analysis and Tools
Linda HuntScience Systems & Applications Inc., NASA LaRC
Brian E. RheingansJet Propulsion Laboratory, California Institute of Technology
Accessing and using MISR products in climate and environmental research
IGARSS, Cape TownJuly 2009
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Background
• Terra follows a pattern of orbital paths which repeats after 233 unique orbits
• A path begins at a particular longitude as the satellite crosses the ascending node
• MISR data are geolocated using the Space Oblique Mercator (SOM) projection to minimize shape distortion and scale errors along the MISR swath near the satellite ground track
• SOM defines a separate projection for each path
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Terra Orbits, August 27, 2004er
175191 159 143 1272072236223854 7086111 95
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MISR Orbital Paths/Blocks
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MISR Blocks
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MISR Data File Organization
• MISR files are written in the HDF-EOS format based on HDF4 (Hierarchical Data Format http:// hdfgroup.org)
• HDF-EOS extends HDF by adding geolocation information
• MISR uses the HDF-EOS grid structure which geolocates based on map projection parameters and specification of the corner coordinates
• Extensive information is written into the file as metadata• File attributes• Grid attributes
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MISR HDF-EOS “Stacked Block” File
MISR Stacked Block Grid (180 Blocks)
-Data stored as a three-dimensional array: sample by line by block-SOM coordinates of top-block corners are Grid metadata.-Projection and orbital parameters are Grid Metadata-Horizontal (sample) offset of each block from the one above is part of Stacked-block grid extension metadata.
Blockdimension
Sample dim / SOM Y
Line dim / SOM XLevel 1B2
And Level 2Products
Standard Product Files are “Stacked-Block”
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MISR “Conventional” Format File
•2
• 2-dimensional array
• HDF-EOS grid format
• SOM map projection
• Same spatial resolution, grid names, metadata
• Identical data values, no resampling, except data at 35.2 at 70.4 km resolution
• Available via MISR Order Tool
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Where does this pixel belong with the MISR HDF-EOS “Stacked Block” Scheme?
• Inside the HDF-EOS “stacked block grid” = (block, line, sample)
• Convert (block, line, sample) <-> SOM (x,y)
– Requires several metadata values and some arithmetic.
• Convert SOM (x,y) <-> Lat/Lon
– Requires use of GCTP map projection coordinate conversion library in HDF-EOS distribution.
• Units: Integral block, fractional line/sample; meters x/y; decimal degrees Lat/Lon.
• This process is described in the MISR Data Product Specification, Appendix A and also routines are provided in the MISR Toolkit.
• Or simply look up the Lat/Lon of the corresponding block, line, sample in the Ancillary Geographic Product (AGP) datasets (1.1km).
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MISR Data Products Specifications
http://eosweb.larc.nasa.gov/PRODOCS/misr/table_misr.html
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MISRViewFor the “Stacked Block” Products
• Maps path/orbit to time and date• Assembles MISR blocks• Reports Lat/Lon using the AGP• Displays true color MISR imagery• Can reproject MISR imagery• Requires IDL or IDL VM
• Perspective tool• Band slider tool• Scroll tool• Vector overlay tool• Reprojection tool• Color / Contrast tools
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MISRView – Main Menu
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MISRView – L1B2 imagery
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MISRView – MISR Vision (R-Ba, G-An, B-Bf)
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MISR INteractive eXplorer (MINX)
It includes high-level options to create:
• Map views of MISR orbit locations
• Scrollable, single-camera, RGB images of MISR level 1B2 (L1B2) radiance data
• Animations of the nine MISR camera images that provide a 3D perspective of the scenes that MISR has acquired
Some of the specialized options in MINX enable the user to:
• Display plots of top-of-atmosphere BRF vs. camera-angle for pixels you click on
• Save images and animations to disk in various formats
• Apply a geometric registration correction to camera images
• Difference the images of two MISR orbits that share a path (identical ground track)
• Construct pseudo-color images by assigning different combinations of MISR cameras to the RGB display channels
• Interactively digitize smoke, volcanic or dust plumes and automatically retrieve heights and winds, albedo, aerosol properties and fire power and brightness temperatures associated with those plumes
A interactive application that functions both as a general-purpose tool to visualize MISR data and as a specialized tool to analyze properties of smoke, volcanic and dust plumes
http://www.openchannelfoundation.org/projects/MINX/
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MISR INteractive eXplorer (MINX)
MISRVision
Camera Ratios
Program Options
Animation Window
Orbit Plot
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MISR INteractive eXplorer (MINX)Digitized Plume Points
Aerosol Histogram
Albedo Profile
Wind Height Histogram
Wind & Height Profiles
Plume Height Contour
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR INteractive eXplorer (MINX)
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MISR Level 3 Overview Web Page
• Can view jpegs of all
available Level 3 data.
• Can view by product and
by month or season.
• Can view animation
through a year’s worth of
data.
• Can directly download
Level 3 HDF files.
• http://eosweb.larc.nasa.gov/PRODOCS/misr/level3/overview.html
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MISR Level 3 Data File Format
• Level 3 data files
• In standard HDF-EOS grid format using a geographic (lat/lon)
projection
• Also produced in netCDF format
• To simply view data images, use Level 3 web page
• Level 3 HDF-EOS data files can be downloaded directly from the
overview web page.
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Introduction to the MISR Toolkit API
• The MISR Toolkit API provides simplified MISR data access and geolocation functionality
• Reads MISR L1B2, L2 in Stacked Block and Conventional format
• Extracts MISR “stacked block HDF-EOS grid” to a geolocated SOM projected plane with blocks assembled into a 2-D array and fields unpacked and unscaled
• Enables selection of a subset or region defined either by path/block or lat/lon
• Available as a callable set of routines for C, IDL, and Python programming languages
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MISR Toolkit API Concept (cont.)
In addition to L1B2, and L2 MISR data access the MISR toolkit has the ability to:
• Perform coordinate conversions: lat/lon <-> SOM x/y <-> block/line/sample
• Query a MISR product file to retrieve such information as block range, file version, file type, grid list, field list, dimension list, and other metadata
• Construct MISR filenames and search a directory tree for the file
• Convert between path, orbit and time range
• Determine which paths/orbits cross a particular geographic location or region within a given time range
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MISR Toolkit Platform and LanguageAvailability
Platforms and Languages Available (version 1.2)
• C library on Linux, Mac OS X and Windows XP
• IDL on all platforms via dynamically loadable library
• Python bindings for Linux and Mac OS X
• Command line utilities on Linux and Mac OS X (Useful for scripting or function usage examples)
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Mtk Example(IDL API)
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http://eosweb.larc.nasa.gov/PRODOCS/misr/tools/misr_tools.html
Other Tools to access MISR data
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Additional Links• HDF4 information, library routines, HDFView tool
http://hdfgroup.org
• HDF-EOS information, library routines, HDF-EOS Plug-in for HDFView, and other HDF-EOS tools
http://hdfeos.net/
• Open Channel Foundation for misr_view, MINX, MISR Toolkit https://www.openchannelsoftware.com/ Search for “MISR” in the Quick Applications Search field
• ITT Visual Information Solutions (IDL and IDL Virtual Machine) http://ittvis.com
• Atmospheric Science Data Center MISR main page http://eosweb.larc.nasa.gov/PRODOCS/misr/table_misr.html
ASDC User Services [email protected]