00:01I will start my presentation with a little readout.
00:06And just to give you some feel of what the tangible GIS is all about.
00:13And you can see there a three-dimensional scale model which is flexible...
00:19...and which is linked to geographic information system and which runs a simulation.
00:25And in that simulation we had water flowing through the drought.
00:29So we can take a piece of the drought out, rerun the simulation...
00:33...and see what the consequences of changing that topography would be.
00:38Then we can decide that we will put a small check dam into the landscape.
00:43And now we want to see what will be the consequences of this new design.
00:47And you can see at the very beginning it actually works.
00:51It slows down the water flow.
00:53But at some point the water just gets all over the, all over check dam.
00:59So with this design, what we are creating here is three-dimensional interface to our simulations and to the geographic information system...
01:11...that allows us to change the topography, to change the landscape, and see what the consequences would be.
01:19So now I will switch to my presentation, and let's see.
01:27So, and let's look at what it is all about.
01:30So we have already seen here sketches, sketching in two-dimensional space on two-dimensional touch table.
01:40But can we do this with 3D?
01:42Because our designs are really three-dimensional designs.
01:45So how do we do this in 3D?
01:50So the original idea actually came from MIT Media Lab and Sensible City Laboratory...
01:56...where they came up with this concept of illuminating clay where you have a three-dimensional, flexible surface...
02:03...that you can change, you can scan it, you can compute the analysis and then project the results over the surface.
02:11So what we have done at NC State, we have taken this concept and we have hooked it to geographic information system...
02:19...which opened many, many more possibilities for working with the system.
02:24So what we have here is the system, it has three-dimensional laser scanner.
02:30That's how you get the data into the GIS.
02:33It has projectors.
02:35That's how you project the data from the GIS onto the three-dimensional model.
02:42So what we can do, we can modify the model, then import it into GIS.
02:46We compute the DEM, run the simulation, and project the results.
02:51So you can generate, very quickly, many different scenarios.
02:56For example, we can add buildings, we can dig in the ponds, add dams, add roads, we can change the land surface processes.
03:05You can use different materials, put it onto the, on the surface to change the roughness, for example, of the surface.
03:14And then what can you do with it?
03:16Once you have your design, you can really explore various aspects of your design.
03:22Everything that is available in your GIS, all of those analyses, you can do with your new design.
03:30So you can compute simple analysis, such as slope and aspect.
03:33You can look at what kind of impact your buildings will have on viewshed or line of sight.
03:39You can look at flow accumulation, runoff.
03:42That's what I have shown in the video.
03:45You can look at soil erosion and deposition.
03:47You can compute solar energy potential for different designs, different configurations of landscape.
03:54So let's look at our little case study.
03:58This is real topography, this is digital elevation model from LIDAR data.
04:04And you can see what kind of problems we have in that small watershed.
04:07We have sediment pollution, we have flooding.
04:10That was the drought that was flooding, which I have shown in the first simulation.
04:17So here is among the many, many things that you can do.
04:21You can add the buildings so you can start asking the questions.
04:25What will happen with runoff if I put the buildings there?
04:29So the model is, you put on the buildings, the model is scanned...
04:33...you can compute the difference between the old and the new model...
04:37...and you can assign different parameters to these buildings.
04:41So for example, here what we do in this part, we generate 100 percent of the rainfall, turns into runoff from the buildings.
04:52And everywhere else, only 10 percent of the rainfall turns into water flow.
04:57And that way, we can actually estimate how much are these buildings contributing to the overall runoff or amount of water here.
05:07Then we can rerun the scenario where we have 100 percent turning into runoff everywhere.
05:13So you can see the consequences of changing these.
05:17Or you can explore. What if I put green, green roof onto these buildings?
05:22What will be the consequence?
05:23And again, you are doing it by interacting with this three-dimensional environment and using the standard GIS tools.
05:32And the real fun that we have with this environment is people coming in and wanting to see it, want to see the demo.
05:40So one thing that I always ask them to do, you do your own design.
05:45So this is, so now I have a really nice gallery of incredible creative approaches that different people with different backgrounds...
05:54...come in and try to design this landscape and try to explore different things.
06:00And they can look around the lab and pick up different materials, for example, to change the, to change the surface properties.
06:10For example, here the, here one of the visitors put the CD-ROM on the, on the, on the landscape, and he just tried to, wanted to see...
06:24...whether the laser scanner will work the same way as airborne laser scanner works, so you don't get any response from very shiny surfaces.
06:33So we created a lagoon out of it.
06:36So there are many, many different approaches.
06:39I had one architect that used just the, just little pieces of paper, putting there for the buildings.
06:48So all kinds of things that people really start getting creative.
06:52And you can have not just one person working with it, but you can have two or three people playing around with it.
06:58And it's really, really simple to generate, to generate these different scenarios.
07:07So we have seen already that.
07:09And we are using this environment for many things.
07:12It's really a multipurpose environment.
07:15We learn how to scan and how to work with the point clouds, because that's the laser scanner.
07:22But we also test algorithms for analysis and simulations.
07:26So you can see, for example, here we put the, a very, very rough surface.
07:34And you can see we can test whether our models can actually handle something like this.
07:40And then, of course, the main purpose is to explore and demonstrate spatial impacts of landscape change...
07:47...which you can generate very easily within this three-dimensional environment.
Landscape Design with Tangible GIS
Helena Mitasova shows the combination of a real-world digital elevation model with a flexible, laboratory-scale 3D model, indoor laser scanner, and projectors into a tangible geospatial modeling system at the 2010 GeoDesign Summit.
- Recorded: Jan 5th, 2010
- Runtime: 07:58
- Views: 15689
- Published: Aug 25th, 2010
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