00:01Lidar often contains hundreds of millions of points stored in multiple files…
00:05…making for a data management, analysis, and dissemination nightmare.
00:10Please welcome our lead 3D product engineer to take away the nightmare, Nathan Shephard.
00:22Collections of lidar can be enormous, and they come with several requirements.
00:26You want quick viewing, update an analysis, and you want to be able to manage and share that data with others.
00:32At 10.1, ArcGIS has native support for lidar and all the tools you need for working with it.
00:39Let's start with viewing lidar.
00:42I recently downloaded some lidar from the USGS, about 10 million points, and are delivered in 20 LASS files.
00:53 To view this data, it's as simple as pointing to the folder containing those LASS files and hitting OK.
00:59And in a few seconds, we're seeing lidar natively in ArcMap.
01:07It's okay to clap.
01:10By default, it's rendered as elevation points, but we can use other lidar attributes such as the class code.
01:17Now we see blue points for the ocean, brown points for the ground, green points for vegetation.
01:25It's a layer so we can change symbology and make our building points yellow.
01:30Now lidar is 3D, so we've included a 3D preview window for lidar…
01:45…and the ability to drag out a profile line and see it as a cross section.
01:52You might notice that some of these points aren't classified yet, these light gray points.
01:56And because the human is really good at recognizing objects from abstract things like treetops from a bunch of points…
02:04…we can update those class codes directly in the source LASS files.
02:10And, we've been looking at lidar as points. We can also look at lidar as a surface.
02:20Right now I'm using all the points to generate a surface from my lidar…
02:25…and it contains buildings and trees and outhouses, and it's a really good surface for doing line of sight.
02:32We can filter our data, and we can use the ground points after I change it correctly to the right filter.
02:45Now we can see that lidar as a surface, and this is good for slope analysis or creating contours.
02:54So you add those in.
02:56The point is, you can choose which points participate in your lidar surface…
03:00… and then use it for many different types of analysis.
03:04ArcScene also supports lidar, and in this view…
03:09…you can see that that bare earth lidar surface is very messy and noisy over the ocean, over the bay.
03:15We can use constraint features to improve that surface.
03:23And, if we want to see our buildings and trees and boats and outhouses again…
03:30…we can just add the nonground points as a second layer and then zoom in and continue to investigate our lidar.
03:46So that's an introduction to quick viewing and analysis of lidar. Let's talk about data management and sharing.
03:53At [ArcGIS] 10.1, the mosaic dataset has been expanded to also support lidar…
03:58…so I can manage and look after my San Diego data using a mosaic.
04:03I can use that same mosaic for all of my California lidar like the strip of lidar that's along the coast at Huntington Beach…
04:16I can see the full extent of all my lidar.
04:19The point is my lidar is managed.
04:23Then, when it's time to share this lidar with others, we simply publish this mosaic out as and image service.
04:30And when it's time to do our next project, say for Crafton Hills College…
04:34…we simply connect to our Amazon server in the cloud, we drag in the image server, and we can see we have lidar coverage here.
04:44This is a rasterized, hillshaded representation of my lidar.
04:49If I need to work with the points, then the download option makes it easy for me to select…
04:55…and then download the LASS files that I need for this area.
05:01My lidar is shared and it's accessible.
05:11To wrap up, let's look at a slightly different kind of lidar, lidar captured from the ground.
05:18Here we have a hundred million points captured by NAVTEQ by their roaming trucks.
05:27This data is really good for validating your existing GIS data such as the size, shape, and height of your buildings.
05:36It also contains beautiful color values so it's adding some realism to my view.
05:43By default, ArcScene is thinning out the number of points. I can always choose to see an area in full resolution.
05:59Some of you are already using lidar.
06:00Some of you have got lidar tucked away in bookshelves, cupboards, under your desk.
06:05At [ArcGIS] 10.1, we really want you to get that lidar out, start working with it and taking advantage of these new capabilities.
Native Support for Lidar
Nathan Shephard introduces new lidar visualization, analysis, and dissemination capabilities that will be a core component of ArcGIS 10.1.
- Recorded: Jul 11th, 2011
- Runtime: 06:11
- Views: 14189
- Published: Jul 27th, 2011
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