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3D Analyst Lidar Solutions
Peter Becker
Esri European User Conference October 15-17, 2012 | Oslo, Norway
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Agenda
• Introduction to Lidar • Lidar and LAS datasets • Lidar and terrain datasets • Lidar and Mosaic datasets • Sharing Lidar
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Lidar – Light detection and ranging
• Lidar (light detection and ranging) is an optical remote-sensing technique that uses laser light to densely sample the surface of the earth, producing highly accurate x,y,z measurements.
• Laser pulses emitted from a Lidar system reflect from objects both on and above the ground surface.
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Types of Lidar
• Airborne - Captured from aircraft - Suitable for surface analysis
• Terrestrial - Captured from the ground - Suitable for feature location and data validation
Dense data can have elements of both
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Multiple laser returns Lidar data
First Return
SecondReturn
ThirdReturn
Last Return
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Digital surface model creation from Lidar Lidar data
First Return
SecondReturn
ThirdReturn
Last Return
DSM
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Digital elevation model creation from Lidar Lidar data
First Return
SecondReturn
ThirdReturn
Last Return
DSM
DTM
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Surface using breaklines Lidar data
Breaklines may be required for less dense lidar or for terrain form enforcement
First Return
SecondReturn
ThirdReturn
Last Return
DSM
DTM Breakline
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Lidar Preprocessing
Acquisition Point Clouds Pre-Processing
• Sensor calibration • Georeferencing • Q/A & Q/C? • Automated classification? • Tiling?
File01.las File02.las … File99.las
Multiple Files
/ Folders
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Lidar storage
• Lidar data is commonly stored in LAS files • A LAS file is a binary file format for Lidar data storage
developed by the ASPRS in conjunction with private and government stakeholders.
• Each LAS file contains metadata of the Lidar survey in a header block followed by individual records for each laser pulse recorded.
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Lidar classification
• Lidar points can be grouped together into classes that represent similar features.
• Defined by the ASPRS.
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Challenges of working with Lidar data
• Huge volumes • Multiple sources • Multiple projections • Varying accuracy • Multiple representations
• How to manage? • How to analyze? • How to access?
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Previous ArcGIS 10.0 support for Lidar
• Geodatabase oriented - Import ASCII or LAS - Multipoints - Terrain dataset
• Point To Raster tool • Terrain and TIN-based surface tools • Help
- Terrain concepts book - 3D Analyst tutorial terrain exercise - 3D Analyst ‘Lidar solutions in ArcGIS’ guide book
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LAS support in ArcGIS 10.1
File01.las File02.las … File99.las
Multiple Files / Folders Tiled / Overlapping
Extents (Location / Time)
P R O J E C T S
O R G A N I Z E
Analyze / Update Data
Manage Serve / Share
Mosaic Dataset
LAS Dataset
1
LAS Dataset
2 LAS/Terrain Datasets
LAS Dataset
3
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Using Lidar as a LAS dataset
• New data type • File based • Stores references to LAS files on disk • Optionally reference breakline & constraint data • Treats a collection of LAS files as one logical dataset
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LAS Dataset Strengths
• Direct access to LAS • Catalog of LAS files for a project • View as points, TIN • Direct measurements • Statistics, Q/A & Q/C • Filter, query • Profile, 3D • Edit LAS • Add and edit constraints
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LAS Dataset Creation
• Interactively via Catalog - File folder context menu pick
• Inside scripts and models with GP tools
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LAS dataset properties
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LAS Dataset / LAS File Statistics
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Viewing Lidar as a LAS dataset
• In 2D (ArcMap) or 3D (ArcScene) • As points
- Symbolize using LAS attributes (Class Codes, RGB, Scan Angle, etc.)
• As a surface - Symbolize & filter using surface options
(Bare earth, First return, etc.)
• Control the number of points shown - Full resolution in a local area
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Data courtesy Merrick & Co.
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LAS Dataset – Editing Class Codes
• Manual - Fixing data anomalies and misclassifications via
point profile window
• Process (GP tools) - Classify relative to feature data - Reclassify to standard LAS spec
• Automated - Done by Partners
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Interactive Editing
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Batch Oriented Editing
Reclassify old class to new class
Set class by proximity to feature data
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LAS Dataset Analysis
• Derive surfaces - As raster - As TIN
• Direct surface analysis - Interpolate shape - Add surface information - Line of sight - Skyline - Locate outliers
• Rasterize on point metrics - LAS point statistics as a surface
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Airborne vs. terrestrial Lidar
• Most tools primarily for airborne Lidar - Surface views and analysis - LAS attributes
• Terrestrial Lidar supported primarily as point cloud in ArcScene
- Points used as backdrop for measuring and digitizing - Display integrated with other GIS layers
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LAS dataset
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Modeling Elevation Options
• LAS • Terrains • Raster
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Terrain Dataset
• Points & constraints
• Stored in the geodatabase
• Schema: Defines feature class participation
• On-the-fly TIN
• Multi-resolution (pyramid z tolerance)
• Highly scalable & I/O efficient
• Attributes
• Editable, versioned
• For high quality surfaces
Points and Breaklines
Terrain Pyramids
Low Resolution Medium Resolution High Resolution
Multi-resolution surface created from measurements stored in feature classes
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Terrain Dataset used to Define Managed Surface Lidar data
Terrains efficiently store and mange the terrain form
First Return
SecondReturn
ThirdReturn
Last Return
DSM
DTM Breakline
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Terrain dataset editing
• Updates accomplished through edits to source measurements
- Append, remove, replace mass points by area - Standard/custom edit tools (e.g. Standard ArcGIS license)
used to modify polylines, polygons, spot heights - Terrain rebuild based on dirty-areas
• Support for versioning in SDE
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Creating a terrain dataset
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Viewing Lidar as a terrain dataset
• Symbology same as TIN in ArcMap • Resolution changes depending on zoom level in ArcMap • Terrain datasets can be displayed as either elevation or
draped layers in ArcGlobe • Terrain datasets are not directly supported in ArcScene
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Analysis capabilities for terrain datasets
• QA/QC Lidar data • DEM / DSM creation • Slope, Aspect, Contours • Surface differencing • Intensity image generation • Estimating forest canopy • Data area delineation • Thinning / reducing noise • Spot interpolation • Profiling
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Raster (Regular Grid) Advantages
• Very Compact • Very Fast Access • Simple Viewing • Simple Analysis • Multiple derivatives But Courser approximation Can not define breaklines Generated from LAS or Terrains As a Derived Product or On-The-Fly
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Using Mosaic Datasets to Manage and Serve Lidar
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Image Management Workflow – Using Mosaic Datasets
• Create Catalog of imagery • Reference Source
• Ingest & Define Metadata
• Define Processing to be Applied
• Define Imagery Products • Dynamic Mosaicking • On-the-fly Processing
• Access as Image or Catalog
Highly Scalable, from Small to Massive Volumes of Imagery
Desktop
Mosaic Dataset Large Image
Collections
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Image Dissemination – ArcGIS Server
• Dynamic Image Services • Processing & Analysis
• Catalog of Metadata
• Static Cached Imagery • Simple Backdrop
• Geoprocessing Services • Processing Tasks
Making Imagery Accessible to Desktop, Web and Mobile Apps
Desktop
Mosaic Dataset Large Image
Collections Server On Premise or In Cloud
Desktop, Web & Mobile Users
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Using Lidar in Mosaic Datasets
• Lidar sources treated as raster type - LAS file
- Individual - Folder
- LAS Dataset - Terrain Dataset
• Must set properties to control the surface generation
- Pixel size - Return types - Classification types
Provides dynamic rasterization, mosaicking, and on-the-fly processing
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Dynamic mosaicking and rasterization
• Display multi-resolution data together • Mosaicking rules
- Control the order of display - By attribute - Closest to center
- Ensure best data is always displayed - Can be controlled by user
• Queries - Refine selection of data
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On-the-fly processing
• Data is processed as it is accessed • Create multiple products from one source • Processing for elevation
- Hillshade - Shaded Relief - Aspect - Slope - Convolution Filters
• Define processing functions - On each item - On entire collection
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Benefits of managing Lidar with the mosaic dataset
• Store multiple collections and projects • Store variety of elevation data
- Topographic or bathymetric - Point or raster
• Unlimited size • Provide access to all data
- As raster - As source data - Share internally and online
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Manage and share using a mosaic dataset
• Optimum model for Lidar and image data management • Manage
- Multiple projects as single dataset - Metadata
• Visualize and process - As 2D or 3D surface - DEM, hillshade, slope, etc.
• Share - As a single dataset - As image service
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Using a mosaic dataset
• As an image - Seamless display - Perform pixel-based analysis - Use as an input to geoprocessing tool - Export a raster dataset
• As a catalog - Selection/query - Add selected images to map - View data and metadata - Time aware
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Sharing Lidar data
• Share as image services • Easy to
- Access - Discover - Download
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How to serve Lidar data
• Image service - Lidar data (or imagery) added to a mosaic dataset and made
available by a server to a client application - Requires the Image Extension - Access • Discover • Download
• Map service
- Point data, terrain dataset, or mosaic dataset* added to a map document and made available by a server to a client application
- Views map layer as it was designed
* requires Image Extension
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Access, discover, and download
LAS files Image service
LAS dataset
Catalog/table Rasterized surfaces
New
VIEW/QUERY
DOWNLOAD
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Multiple Elevation Data Sources Constraints
LAS files LAS Dataset Terrains Raster grids
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Multiple Elevation Data Sources
Mosaic Dataset
Constraints
LAS files LAS Dataset Terrains Raster grids
• Catalog of data sources • Contains metadata • Defines processing • Directly accessed
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Multiple Elevation Data Sources
Web Mobile Desktop
Mosaic Dataset
Constraints
LAS files LAS Dataset Terrains Raster grids
• Catalog of data sources • Contains metadata • Defines processing • Serve to many applications
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Questions?