Interoperable data systems for satellite airborne and terrestrial lidar data
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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.

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Interoperable Data Systems for Satellite, Airborne and Terrestrial LiDAR Data

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Interoperable data systems for satellite airborne and terrestrial lidar data

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


Lidar data platforms

LiDAR Data Platforms

Distributed and Large Collections from a diverse set of LiDAR Platforms

5 million points/day

10 km altitude

10 m footprint

~500 thousand points/day

600 km altitude

70 m footprint

High Altitude Airborne

Laser Vegetation Imaging System ( LVIS)

Satellite - Icesat

500 million-1 billion/day

0.5 km altitude

20 cm footprint

100-500 million points/day

tripod

1 cm footprint

Low Altitude Airborne Laser Scanning

Terrestrial LiDAR Scanning


Nlas system overview

NLAS System Overview

Objective of NLAS Project

(NASA Laser Access System)

  • 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)


Nlas system overview1

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

NLAS RAMADDA

LVIS

ICESat/GLAS


Open topography

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

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

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

Open Topography - Other LiDAR Examples

  • Terrestrial Laser Scanning example

  • Subset area of interest

  • Download options include: ASCII Point Cloud, DEM, Hillshade & Slope Products, kmz, and image

  • 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)


Nlas interoperability

Interoperability with Data

Repository Web Service

Open Topography

Visualization/Analysis Clients

NLAS Interoperability

HTML Interface

NLAS Web Service

NLAS/RAMADDA

NLAS Web Service


Nlas data repository lvis example

NLAS Data Repository – LVIS Example

NLAS/RAMADDA

Capabilities and Data Queries

Web services

  • Spatial queries

  • Spatial/temporal subset

  • Data Conversion

  • Product generation

Open Topography Portal

Metadata

Database

Responses and Data

Metadata

harvesting

LiDAR Tools

File store

Ingest

Other Clients

LCE, LGE, LGW

LVIS Data System

LVIS Product Generation


Nlas ramadda

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

NLAS/LiDAR Tools

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

LiDAR Subset Form

Data Access direct from NLAS/RAMADDA


Lidar waveform data

LiDAR Waveform Data

Full Waveform LiDAR Data

Transmit Pulse

Alternate Signal Start

Outer Canopy Relief

Canopy Inflection

Standard Gaussian Fit

Within Canopy Light Extinction

Ground Relief

Alternate Signal End

1064 nm laser pulse footprint

~ 70 m diameter spaced 175 m along profile

Amplitude (volts)


Nlas ramadda waveform display

NLAS/RAMADDA Waveform Display

NLAS/RAMADDA

Waveform Display


Status and next steps

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


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