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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)

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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)

Page 2: Lidar - Working with LAS Datasets - Amazon S3€¦ · Using Geo-processing tools . Lidar - Working with LAS Datasets . Esri UC2013 . ... Lidar - Working with LAS Datasets . Tools

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

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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

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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

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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

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Esri UC2013 . Technical Workshop .

LAS Dataset - Editing

• Manual editing (data errors, mis-classifications)

• Using Geo-processing tools

Lidar - Working with LAS Datasets

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Esri UC2013 . Technical Workshop .

LAS Dataset - Surface definition

• Support for break-lines (Surface constraints)

Lidar - Working with LAS Datasets

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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

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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

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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

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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

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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

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LAS Dataset Basics

DEMO

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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

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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

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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

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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

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Esri UC2013 . Technical Workshop .

LAS Dataset To Raster - Performance Improvement with Spatial Index

Lidar - Working with LAS Datasets

Small files < 200MB Large files > 1GB

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Esri UC2013 . Technical Workshop .

New in ArcGIS 10.2

DEMO

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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

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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

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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

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3D Resource Center - Utilities

CheckLAS LAS Model Key LAS To LAS

Height Above Ground Ground Classifier LAS Dataset Tools

Lidar - Working with LAS Datasets

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Esri UC2013 . Technical Workshop .

Custom Tools

DEMO

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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

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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

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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

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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

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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

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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

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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

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