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Esri UC2013 . Technical Workshop .
Technical Workshop
2013 Esri International User Conference July 8–12, 2013 | San Diego, California
Lidar – Working with LAS Datasets Raghav Vemula (3D Team)
Esri UC2013 . Technical Workshop .
Agenda
• Las Dataset Overview • Demo • What's new in ArcGIS 10.2 • Demo • Recommendations • Custom tools (3D Resource Center) • Demo • Future (Post 10.2) • Q & A
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset - Overview
• LAS Dataset - File based data structure - Stores references to LAS files on disk - Treats a collection of LAS files as one logical dataset - Optionally reference break-line data
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset - Visualization
• In 2D (ArcMap) or 3D (ArcScene)
• As points - Symbolize using LAS attributes (Class Codes, RGB etc.)
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset - Visualization
• As a surface - Symbolize & filter (Bare-earth, First-return, etc.)
• Control the number of points shown
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset - Editing
• Manual editing (data errors, mis-classifications)
• Using Geo-processing tools
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset - Surface definition
• Support for break-lines (Surface constraints)
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
GP Tool Summary
3D Analyst
Conversion
Data Management
Conversion
To Raster
Data Management
LAS Dataset
Layers and Table Views
Lidar - Working with LAS Datasets
Tools enhanced to support LAS Dataset
Esri UC2013 . Technical Workshop .
LAS Dataset - Analysis
• Derive surfaces - LAS Dataset As Raster - LAS Dataset As TIN
• Direct analysis - Interpolate Shape - Add Surface Information - Line Of Sight - Locate Outliers
• Rasterize on point metrics - LAS Point Statistics As Raster
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset - Spatial Reference Support
• Assign spatial reference (if missing) • Override using a .prj file (if already present) • Project • Clip using an area-of-interest
File extent
Clipped file extent Study Area
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Lidar data - Sharing
• Mosaic Dataset - Manage Lidar data like imagery - Add / remove LAS files - Add / remove LAS datasets
• Share the data as Image services
- Easy for others to see available Lidar data - Easy to download for project work
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset API for developers
• Freedom to work in multiple languages - Arcobjects exposed in C++, .NET, Java
• Access to lidar data through image services - E.g. download and query
• 3rd party developers can build custom applications - E.g. Automated classification, Feature extraction, Reality
augmentation
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset Basics
DEMO
Esri UC2013 . Technical Workshop .
New in ArcGIS 10.2 - Indexing
• LAS auxiliary file (.lasx) • Improves performance of spatial queries • Efficient use of larger files and files over a network • Benefits both visualization and data processing • Index auto-updates after editing operations
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Index creation
file1.las
file2.las
Folder
…….
Add Compute Stats
file1.las
file1.lasx
file2.las
file2.lasx
…….
Folder LAS Dataset
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
The index (.LASX) file
• Container file for stats and index • One-to-one association with LAS file • Located next to LAS file • Reusable
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
New in ArcGIS 10.2 - Rearrange
• Rewrite LAS files with optimal point ordering • Physical sort of point records • Results in an optimized index • Benefits data retrieval operations • Custom GP tool will be published • Utility for evaluating need for rearrangement will be available
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
LAS Dataset To Raster - Performance Improvement with Spatial Index
Lidar - Working with LAS Datasets
Small files < 200MB Large files > 1GB
Esri UC2013 . Technical Workshop .
New in ArcGIS 10.2
DEMO
Esri UC2013 . Technical Workshop .
Data delivery Recommendations
• ‘Rearranged’ LAS, including “.lasx” file, provided as deliverable to client
• Yields best performance without client needing to do anything
• Does not hurt non-Esri clients
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Usage Recommendations
• Classified LAS files organized as ‘tiles’ • 200 MB file size limit • All participating LAS files have the same Spatial Reference (Projected CS)
• Data location (preferably on a local disk)
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Licensing
• Standard, 3D, or Spatial Analyst License - Create LAS dataset - Modify LAS dataset schema - Include in Mosaic dataset
- Publishing requires Image Server extension - View in 2D - Rasterize
• 3D Analyst License - Edit class codes - View in 3D - TIN based surface analysis - Rearrangement
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
3D Resource Center - Utilities
CheckLAS LAS Model Key LAS To LAS
Height Above Ground Ground Classifier LAS Dataset Tools
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Custom Tools
DEMO
Esri UC2013 . Technical Workshop .
Airborne Vs. Terrestrial Lidar
• Many tools cater to airborne Lidar data - Surface views and analysis tools - LAS attribute relevance
• Terrestrial lidar supported as point cloud in ArcScene
- Points used as backdrop for measuring and digitizing - Display integrated with other GIS layers
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Las Dataset Vs. Terrains
• Geo-database • Z-tolerance pyramiding • Duplication of Lidar data • Editing • 3D Viewing • Las Dataset and Terrains are complimentary
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Future (Post 10.2)
• Enhancements - Some custom tools will be provided out of the box
- Ground classifier, Model key etc. - Potential new functionality
- Tile, Clip, Merge - Break-line extraction - Include Z as part of point filtering - Assign RGB from photo - Fast outlier detection
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Future (Post 10.2)
• Compression - Esri compressed LAS - Lossless - Transparently treated as LAS but much better for
use and exploitation - Library for 3rd party use
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Why use 3D GIS?
Improve understanding 3D is easy for everyone to understand
Because our world is 3D
Better communication 3D makes it easier to articulate ideas
Solve 3D problems Some spatial problems can only be solved in 3D
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
What can you do with ArcGIS 3D?
Multiscale 3D Models
Surface modeling
3D Analysis
Native lidar support
Share 3D scenes
Integrated 3D
ArcGIS for 3D Cities
3D Geodesign
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop .
Please fill out the session evaluation
Offering ID: 1334
Online – www.esri.com/ucsessionsurveys
Paper – pick up and put in drop box
Thank you…
Lidar - Working with LAS Datasets
Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets