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NASA ROSES ACCESS Project Review
Science Data Systems for Satellite and Airborne LiDAR Data
23 February 2011
C. Meertens and J. McWhirter, UNAVCOS-J. S.Khalsa and T. Haran, NSIDC/CUC. 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
Objective
Approach
Co-Is/Partners
Key Milestones
Advancing Collaborative Connections for Earth System ScienceACCESS
Science Data Systems for Satellite and Airborne LiDAR Data
PI: Charles Meertens, UNAVCO
TRLin=5 TRLcurrent=5
19 April 2010
• 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.
• Define enhanced quality control (QC) metrics and a standard data format to improve evaluation of data quality, data usability, and compatibility with commercial LiDAR software packages.
• Provide users access to point cloud and waveform LiDAR data, on-demand digital elevation models (DEMs) generation, and derivative products and visualizations.
• Collaborate to define an industry-based LiDAR data format for NASA LiDAR data; to define enhanced QC metrics; and to design web services.
• Develop NSIDC ICESAT/GLAS web service.• Develop UNAVCO/GSFC LVIS data repository system
and web service.• Provide integrated user access using OpenTopography
Portal.• Science partner testing of enhanced data and QC
products and portal access.
Portal provides user access to LiDAR point cloud, standard and on-demand digital elevation models
generation.
• Complete data format, QC, and web services definitions.
12/10• Implementation of Data Web Services.
04/11• Beta release of NLAS/OpenTopography Portal with connectivity to NSIDC and UNAVCO. 10/11 • Production release of NLAS Portal. 03/12
S-J. S.Khalsa, NSIDC/CU; C.Baru, SDSC/UCSD; D.Harding, B.Blair, NASA/GSFC; and M.Hofton, U.MD.
High Altitude AirborneLaser Vegetation Imaging System ( LVIS)
~500 thousand points/day600 km altitude70 m footprint
Terrestrial LiDAR Scanning
100-500 million points/daytripod1 cm footprint
Satellite - Icesat
Low Altitude Airborne Laser Scanning
500 million-1 billion/day0.5 km altitude20 cm footprint
LiDAR Data Platforms
5 million points/day10 km altitude10 m footprint
Distributed and Large Collections from a diverse set of LiDAR Platforms
NLAS Project 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.
• Define enhanced quality control (QC) metrics and a standard data format to improve evaluation of data quality, data usability, and compatibility with commercial LiDAR software packages.
• Provide users access to point cloud and waveform LiDAR data, on-demand digital elevation models (DEMs) generation, and derivative products and visualizations.
Public Website(search for “NLAS Opentopography”)
Hosted at OpenTopography
Objectives of NLAS Project(NASA Laser Access System)
Project Collaborative Wiki(uses Google sites nlaswiki)
Project Partners
UNAVCO PI: Charles Meertens, Project managementSoftware Engineer: Jeff McWhirter, Web services, API, and UI development
San Diego Supercomputing Center, University of California, San DiegoCo-PI: Chaitan Baru, Project management support Science Specialist: Chris Crosby, Algorithm Development, Science EvaluationSoftware Engineers: Vishu Nandigam, Minh Phan
Web services, API, and UI development
National Snow and Ice Data Center, NSIDC, CUCo-PI: Siri Jodha Singh Khalsa, Project management support, ESDSWGSoftware Engineers: Terry Haran, Nitin Khanna
Web services, API, UI and Visualization development
Goddard Space Flight CenterCo-PI: David Harding and Collaborator: Bryan Blair
Define data format, QA/QC, generate new products, science evaluation
University of MarylandCollaborator: Michelle Hofton
Define data format, generate new products, science evaluation
Major Accomplishments
Major Accomplishments• AGU NLAS presentation and NASA booth demo with end-to-end proof of
concept for LVIS, ICESat GLAS, and TLS data
• Ingest of select LVIS and ICESAT/GLAS data sets into Open Topography portal
• Definition of initial new GLAS GLANL format and LVIS Comprehensive format
• NLAS/RAMADDA supports LVIS, LAS, GLAS and ASCII data formats as well as aggregations of those files
• Provisional support for new ICEBRIDGE data sets – ATM, MCORDS, PARIS
• OpenTopography federated web service query to NLAS/RAMADDA for remote data repository collection summary metadata using ATOM caster.
• Public OpenTopography website at http://www.opentopography.org/index.php/about/nlas (sample LVIS collections, LVIS point cloud, DEM service)
Major Milestones
Major Milestones• Complete data format, QC, and web services definitions. 12/10
Draft definitions• Final definitions will evolve in stages over next two quarters
Develop file conversion software for LVIS, GLAS 12/10Note major step to use NLAS/RAMADDA to provide common data
repository and richer web services for LVIS and GLASSample data sets ingested in OT; Presentations at 2010 AGU 04/11
• Implementation of Data Web Services. 04/11
Prototype Catalog of services (connectivity between UNAVCO/SDSC OT)• Full data service implementation at NSIDC, OT
• Beta release of NLAS/OpenTopography Portal with connectivity to NSIDC and UNAVCO. 10/11 • Production release of NLAS Portal. 03/12
Project Schedule Summary
Project Schedule Summary
• Prototyping of NLAS workflow from data repositories to OT samples for LVIS and GLAS: slightly ahead of schedule
• Expedited by decision to utilize RAMADDA framework for data repositories and universal, flexible data translation web service
• Definition of data formats and enhanced QC/QA: on schedule• Definition of full data web services API and implementation : behind
schedule• Processing of complete datasets into comprehensive formats: behind
schedule• Science partner utilization of NLAS services: slightly behind schedule• Publicizing NLAS project: ahead of schedule
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
OpenTopographyOpenTopography
LVIS
LVIS
ICESat/GLASICESat/GLAS
NLAS RAMADDANLAS RAMADDA
Open Topography
OpenTopography Search
• Map Interface• Metadata about Dataset• Access to download and processing interface
• Public website http://www.opentopography.org/index.php/about/nlas
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
OpenTopographyOn-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 - GLAS LiDAR Examples
ICESat/GLAS example
• Subset area of interest (below left)• Download ASCII Lat, Long, Elev (X,Y,Z)
• Example of subsequent import into Excel and plot of shot number vs elevation (below right)
Beta Server at: http://ot-beta.sdsc.edu:8080/gridsphere/gridsphere?cid=datasets
OT query of NLAS/RAMADDA product catalog using web services with ATOM casting just completed (see beta server)
Open Topography - Other LiDAR Examples
Terrestrial Laser Scanning example (NSF OT Development)• Subset area of interest• Download options include: ASCII Point Cloud, DEM, Hillshade & Slope Products, kmz, and image• Note that UNAVCO will implement TLS into RAMADDA for NSF
NLAS Interoperability
NLAS/RAMADDA
Open Topography Visualization/Analysis Clients
NLAS Web Service
HTML Interface
NLAS Web Service
Interoperability with DataRepository Web Service
NLAS – ICESat/GLAS GLANL/QCQA
ICESat Consolidated and Enhanced Altimetry Data Structure
Consolidation of parameters from 8 GLA product files•Eliminating numerous redundant, invalid and unused parameters•Producing a single data record for each laser shot
Selection of subsets from full ICESat GLA product files•Currently ~160 unique parameters in products•NLAS/GLANL 100 parameters in “long” subset for advanced users•NLAS/GLANL 18 parameters in “short” subset for casual users
Definition of 25 additional derived parameters for improved ease of use
•e.g., Conversion of waveform-derived relative range offsets to elevations
Definition of 6 QA/QC parameters to guide selection of appropriate data •Source of return: Earth surface, cloud, noise, indeterminate•Cause when no geolocation result reported: no return detected, instrument anomaly•Non-nadir data acquired during spacecraft maneuver•Possible presence of forward scattering range delay•Qualitative range precision assessment from S/N and signal fitting residual•Data reliability: composite yes/no flag for 8 parameters effecting quality
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/RAMADDA (LVIS or GLAS – same
package) Open
Topography Portal
Web services
•Spatial queries•Subsetting
•Data Conversion•Product generation
Ingest
MetadataDatabase
Other Clients
Collection Query
Metadataharvesting
LVIS Data System
File store
LiDAR Tools
Data Request
ATOM Response
LAS, ASCII CSV, etc.
NLAS Data Repository – LVIS Example
NLAS/RAMMADA
Open Topography
Portal
Web services
•Spatial queries•Subsetting
•Data Conversion•Product generation
Ingest
MetadataDatabase
Other Clients
Collection Query
Metadataharvesting
ICESat/GLAS Data System
File store
LiDAR Tools
Data Request
ATOM Response
LAS, ASCII CSV, etc.
NLAS Data Repository – ICESat/GLAS Example
NLAS/LiDAR Tools
NLAS/LiDAR Tools
Stand-alone Extensible Java package for reading and writing various LiDAR formats (made available via SourceForge)– 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(may run demo instead if time allows)
LiDAR Waveform Data
Transmit Pulse
Alternate Signal Start
Outer Canopy Relief
Canopy InflectionStandard Gaussian Fit
Within Canopy Light Extinction
Ground ReliefAlternate 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/RAMADDAWaveform Display
Project Metrics
Metrics Plan•Custom and web log statistics from OpenTopographyhttp://www.opentopography.org/index.php/about/pcmetrics
•NLAS/RAMADDA Repository implementation includes web service API logging•Web log analysis software will be used to parse and summarize information on service requests (e.g. Domain analysis such as IP address, unique visitors, volume of data transferred, number of points processed, jobs executed)•UNAVCO will aggregate repository statistics and will be responsible for upload to NASA metrics system•Additional impact and software reuse metrics separate from the web logs are planned•OT has guest user (no login) and login access that allows increased processing limits and a custom workspace (mylidarjobs). NLAS will determine login and services access requirements and apply to RAMADDA and OT. NLAS will also need to pass through user id or IP through web service API and will bring this up with broader ESDSWG.
Example2008 LVIS Sierra Nevada, CA:Dec 2010 9 jobs 23,341,301 pointsJan 2011 4 jobs 2,186,947 pointsFeb 2011 11 jobs 14,797,042 points
ESDSWG Participation
ESDSWG Participation
Siri Jodha Khalsa is the representative to the ESDSWG
Highlights:• Standards Process Group (SPG) activities
•Participation in monthly teleconferences•Service on two SPG Technical Working Groups evaluating proposed standards and reviewer on third.
• New Orleans meeting in October, 2010 (McWhirter also attended)• Incorporated Atom-based Service Cast output format into the NLAS web service implementation.
Feedback planned to ESDSWG:• Federated distributed search/processing from NLAS Repositories• Web service pass-through of user id/IP• Khalsa is tracking developments of a proposed US national lidar data encoding standard and will provide feedback to ESDSWG.
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 LVISAntarctic Glacier Scan
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