Scarc 2013 working_with_li_dar


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  • Today I will present an overview of the data management products that ArcGIS offers but will focus more on the LAS Dataset – a new data type that we are very excited about introducing with the upcoming release of ArcGIS 10.1.Then we will do a demo of the LAS Dataset, talk a bit about arcobjects API for developers, challenges that we face when working with massive Lidar datasets and our plans for future Lidar support. Finally, I will share some recommendations for the usage of Las Dataset
  • Here is a quick intro to some of the Arcgis version related terminology you will be hearing from the Esri team this week.The current release version of Arcgis is 10. At arcgis 10, we support Lidar workflows through the use of Terrain and Mosaic datasets. The upcoming release of Arcgis 10.1 will be available in June – in couple of months. This new release will add support for the new LAS dataset data-type.
  • So lets take a quick look at the Terrain dataset and its properties.Terrains are multi-resolution tin surfaces created from point measurements stored in feature classes.Some of the most common applications of terrain datasets are topographic and bathymetry mapping. Lidar, Photogrammetry and Sonar are some of the typical data sources
  • So Terrain datasets seem like a perfectly adequate data store for lidar data. So why do we even need a new data type.Well, as great as terrains are, there will be some workflows, where you may want to consider an alternative.Terrains reside inside a geodatabase. That requires you to import all your las points into the geodatabase. One obvious concern associated by that approach is data duplication. And if you are working with billions of points, the process of importing them into a geodatabase and then building a terrain with multiple pyramids can seem a bit time-consuming. And there are workflows where users would first perform quality checks on their raw data before investing the time to build terrains. SO the LAS dataset is our response to address all these concernsIt’s a file based data structure. i.e., it doesn’t live in a geo-databaseIt stores references to LAS files on disk. Point measurements are not imported into the las datasetIt groups a collection of las files as a logical dataset
  • The first step is to create a LAS Dataset.Consider a LAS Dataset a simple catalog of the LAS files that make up a project, providing a single access point to all the files.A LAS Dataset is essentially only an index of files with some metadata to enable faster access.It can be created very quickly in ArcGIS for Desktop. The LAS files remain as they are. (i.e. not imported or converted)
  • Current tools available at 10.1 that accept a LAS Dataset
  • REPLACE SCREENSHOTS with your own.See slide 13 (Sample Screenshots Layout) for instructions on using the graphic frames. You may remove them if desired.
  • Mosaic Datasets are not only useful for managing and serving large collections of imagery, but are also very effective for the serving elevation data. With ArcGIS 10.0 there are some good examples of this in the World Elevation services (see which provide fast and simple access to global elevation data. The World Elevation services provide access not only to a range of data products such as HillShade, Slope, and Aspect, computed directly from the source files, but also enable the data values to be used for aspects such as creating profiles or creating viewsheds. The datasets range from 230m global GMTED data to all the USGS NED data down to 3m in parts of the USA, as well as some sub-meter rasterized Lidar data.With 10.1 Mosaic Datasets have been extended and can now directly access not only rasters, but also large collections of LAS files, LAS datasets (including the constraints) and Terrain Datasets. A Mosaic Dataset can not only catalog all these sources, but dynamically mosaic and serve them. Rules, such as the optimum method for sampling the data, void filling, or applying queries to return only specific return types can all be defined. Mosaic Datasets and associated Image Service provide accessibility.
  • REPLACE SCREENSHOTS with your own.See slide 13 (Sample Screenshots Layout) for instructions on using the graphic frames. You may remove them if desired.
  • Scarc 2013 working_with_li_dar

    1. 1. Kevin ArmstrongWorking with LiDAR in 10.1
    2. 2. Agenda• Working with LiDAR in ArcGIS- Terrain dataset- LAS Dataset- Mosaic Dataset• Demo - LAS Dataset• Demo – Mosaic Dataset• Demo - Analysis
    3. 3. ArcGIS Versions• 10.0 release- Support for Lidar includes Terrain, Mosaic dataset• 10.1 release- New data-type being added – LAS Dataset
    4. 4. Terrain Dataset• Multi-resolution surface• Typical applications- Topographic mapping- Bathymetric mapping• Typical data sources- Lidar- Photogrammetry- Multibeam Sonar
    5. 5. LAS Dataset• New data type• File based• Stores references to LAS files on disk• Optionally reference constraints such as breaklinedata• Treats a collection of LAS files as one logical dataset
    6. 6. Project Workflow in ArcGIS 10.1LAS filesLAS Dataset• Direct access to LAS• Create LAS Dataset- Catalog of LAS files for a project
    7. 7. Viewing lidar• 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
    8. 8. LAS Dataset - Editing• Manual editing (data errors, mis-classifications)• Using Geo – processing tools
    9. 9. Available GP Tools
    10. 10. LAS Dataset
    11. 11. Management and sharing• Manage lidar like imageryvia Mosaic Datasets- Add / remove LAS files- Add / remove LAS datasets• Share the data as Image services- Easy for others to see available lidar- Easy to download for project work
    12. 12. Multiple Elevation Data SourcesWeb MobileDesktopMosaicDatasetLAS filesConstraintsLAS DatasetArcGISServerImageExtension
    13. 13. Dissemination & Analysis