Interoperable Data Systems for Satellite, Airborne and Terrestrial LiDAR Data C. Meertens and J. McWhirter, UNAVCO S-J. S.Khalsa and T. Haran, NSIDC/CU.

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Presentation transcript:

Interoperable Data Systems for Satellite, Airborne and Terrestrial LiDAR Data C. Meertens and J. McWhirter, UNAVCO S-J. S.Khalsa and T. Haran, NSIDC/CU C. Baru and C. Crosby, SDSC/UCSD D. Harding and B. Blair, NASA/GSFC and M. Hofton, U. Maryland ACCESS: Advancing Collaborative Connections for Earth System Science

High Altitude Airborne Laser Vegetation Imaging System ( LVIS) ~500 thousand points/day 600 km altitude 70 m footprint Terrestrial LiDAR Scanning million points/day tripod 1 cm footprint Satellite - Icesat Low Altitude Airborne Laser Scanning 500 million-1 billion/day 0.5 km altitude 20 cm footprint LiDAR Data Platforms 5 million points/day 10 km altitude 10 m footprint Distributed and Large Collections from a diverse set of LiDAR Platforms

NLAS System Overview Provide an integrated system (NLAS) for web services-based access to distributed NASA airborne (LVIS) and satellite (ICESAT/GLAS) LiDAR data archives using OpenTopography technologies. (Google NLAS Opentopography) Objective of NLAS Project (NASA Laser Access System)

NLAS System Overview OpenTopography Currently: Provides users access to ten’s of billions of LiDAR point cloud measurements and in industry standard formats (e.g. ascii, LAS) Provides on-demand processing services to enable generation of digital elevation models (DEMs), derivative products and visualizations. NLAS will provide: Web Services access to distributed archives using a downloadable data repository package (NLAS/RAMADDA) Integrated access to NLAS data via OpenTopography An extensible Java package for reading and writing various LiDAR formats Add full waveform access and enhanced quality control (QC) metrics for ICESat/GLAS and LVIS USERS OpenTopography LVIS ICESat/GLAS NLAS RAMADDA

Open Topography OpenTopography Search Map Interface Metadata about Dataset Access to download and processing interface See demo at OpenTopography Booth! OpenTopography is funded through the National Science Foundation

Open Topography – Data Access Data Downloading and Processing User specifies Download/Processing Parameters 1.) Select area from Map Interface 2.) Point Cloud - Select format (ASCII or LAS) 3.) DEM Generation -Select Gridding Method, parameters, and format

Open Topography - Results Page OpenTopography On-demand Processing Products: Subset of point cloud data Digital Elevation (DEM) Map Visualization product and.kmz file if desired DEM on browser embedded GoogleEarth LVIS example in Sierra Nevada

Open Topography - Other LiDAR Examples ICESat/GLAS example Subset area of interest (left) Download ASCII Lat, Long, Elev (X,Y,Z) Example of subsequent import into Excel and plot of shot number vrs elevation (right) Terrestrial Laser Scanning example Subset area of interest Download options include: ASCII Point Cloud, DEM, Hillshade & Slope Products, kmz, and image

NLAS Interoperability NLAS/RAMADDA Open TopographyVisualization/Analysis Clients NLAS Web Service HTML Interface NLAS Web Service Interoperability with Data Repository Web Service

NLAS Data Repository – LVIS Example NLAS/RAMADDA Open Topography Portal Web services Spatial queries Spatial/temporal subset Data Conversion Product generation Ingest Metadata Database LVIS Product Generation LCE, LGE, LGW Other Clients Capabilities and Data Queries Responses and Data Metadata harvesting LVIS Data System File store LiDAR Tools

NLAS/RAMADDA RAMADDA Overview Data repository framework developed at Unidata/UCAR –Freely available Java based open source package –Extensible plugin architecture Basic content management functionality NLAS/RAMADDA plugin to support LiDAR data services LiDAR data ingest, metadata harvesting and publication Services include: –Map overview, time series and waveform displays –Spatial subset, decimation –Conversion to multiple data format: original binary, LAS, ASCII CSV, … –Product generation - Image, hill shade image, KMZ

NLAS/LiDAR Tools Stand-alone Extensible Java package for reading and writing various LiDAR formats –LAS –LVIS (including waveform) –ICESAT/GLAS products –Other Icebridge formats – ATM, MCORDS, PARIS –Terrestrial Laser Scanning formats – text, PTX –Transforms global XYZ to Lat, Long, Elevation –…

LiDAR Subset Form Data Access direct from NLAS/RAMADDA

LiDAR Waveform Data Transmit Pulse Alternate Signal Start Outer Canopy Relief Canopy Inflection Standard Gaussian Fit Within Canopy Light Extinction Ground Relief Alternate Signal End Amplitude (volts) 1064 nm laser pulse footprint ~ 70 m diameter spaced 175 m along profile Full Waveform LiDAR Data

NLAS/RAMADDA Waveform Display NLAS/RAMADDA Waveform Display

Status and Next Steps Accomplishments LiDAR data repository framework NLAS/RAMADDA Data Repository LiDAR Data translation software tool End-to-end proof of concept –LVIS, ICESat GLAS, TLS New GLAS product –GLANL containing enhanced QC Some Next Steps Define NLAS web service API –Data and metadata discovery –Data service access Implement NLAS production servers for GLAS and LVIS data sets Implement full wave form service into OpenTopography Explore potential application of NLAS services to other data sets – ATM, TLS, etc. GSFC LVIS Antarctic Glacier Scan