3D data can be displayed and navigated using the ArcScene Application. in this case we will add an aerial photograph (e.g. aerial 5 in the tutorial data folder) . About This Tutorial. This article describes the steps required to load and display topographic, geologic, and cultural data in ArcScene and presents several. This tutorial is an introduction to ArcGIS 3D Analyst, an extension for ArcGIS. The extension needs to 1 From the 3D Analyst toolbar click the ArcScene button.
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In an earlier tutorial on Digital Elevation Modelswe got some experience with GIS data sources that tutorkal the elevation of the terrain. This tutorial will take this a step further. We will look at a few additional types of data that let us represent the form of places in arrcscene dimensions, or at least two-and-a-half dimensions!
We are going to start with a large tuyorial repository of data representing terrain, buildings and the arcscrne of the ground. From this we will clip out a smaller dataset that we can play with in 3D without over-burdening a modest computer.
Our clipped dataset is going to include: At the end of the tutorial we create a 3D model from these that we can play with and generate renderings from a tool called ArcScene. In future tutorials, we will see how these elements can also serve as a laboratory for exploring urban design scenarios.
We are beginning a new project that is going to include a new GIS dataset. With this in mind, we should create a new tuyorial system that will hold all of this work.
I recommend that you have an outer folder named for your site, and a sub-folder within this to hold your GIS data. Later, you may add new subfolders to hold the resources that are used and created by other applications. It is convenient to plan our model with a rectangular boundary.
The main reason ardscene the rectangle premise is that tutorkal ground plan of the model is going to be exchanged as an image. And images are always rectangular. By the time we get around to exchanfing the model between a number of tools, you will appreciate the utility of having a retangular model with a vector clipping frame that can be used to register the various parts of the model as we move them into various tools arcacene do not support georeferencing.
As we have explained above, one element of our site model will be an image of the groundplan for our site and its context. This image will represent the roads, water, land and open spaces within the area covered by our clipping frame. The image will also include the outline of the frame. This wil make it very easy ttuorial register the image as with other layers as we export them to other tools. Before we get into exporting the images we should think about resolution.
We don’t want the images to have more resolution than we need, because this will create unnecessary problems in every thing we do subseqently. You should now be able to add your groundplan image to ArcMap. When asked whether you want tutoriql build Pyramid Layerssay yes. For some reason, ArcMap 10 and Rather than usng a sensible default display properties for images of this kind, ArcMap insists on stretching the color ranges all out of whack.
Go to the Layer Properties for your groundplan and in the Symbology properties, change Stretch to None, and uncheck the option for Gamma Stretch. If you export an image from arcmap with the Georeference option checked.
And then change your extent or change your export resolution, arcscens second image will have its georeferencing messed up. Thererfore, it is arcacene to choose a new name for your exported image tytorial you have to export more than once. This is problematic, since the Elevation units are in Meters. You will find this raster in the USGS group layer. Because we want to make a nice compact 3d model, we will export a clip of the elevation model using the same extent that we used to export the groundplan image.
Finally, we will select and save the buildings that occur within our model study area. Then we have everything we need to make a nice compact 3d model of our site! Like above, there are a few ways of doing this. ArcScene is very similar to ArcMap, except it has some additional features for visualizing and navigating data in 3D. The following notes will provide links to documentation that will provide necessary details about how to add your data, adjust the display properties and to navigate your model ttorial 3D.
The following links may help to jog your memory after an in-class demonstration.
Now that you have a 3D model you wil want to try flying around and saving some images that you can use to describe aspects of your site. Se the refeences below for hints on navigating in your ArcScene model. Our rough 3d model can be useful for investigating how places interact visually. Wil lan object theat we create be visible from key places around a site? How will the removal or addition of buildings create or block views?
To demonstrate this capabilitty we will create a point and use a combination of 3D symbols to transform the point inot a representation of a 30 foor tall sign to call attention to the transit stop next to the railroad tracks.
Then we can navigate to different places in the model check whether the sign is visible. Later we will investigate how we can create and preserve view corridors after existing buildings are removed in anticipation of developing a new transit-oriented development. Our T sign is created by making a copy of our point layer.
We represent the column for the sign atcscene a cylinder that has its base on the elevation arccsene and is extruded by 10 meters. Then we make a copy of this layer and change the symbol to a sphere that has its base height set as a constant value of Now that you know how tutorrial create new geometry and navigate to diffeent places you are ready to investigate visibility.
It may be helpful to make the sky blue. Because your model is not perfect you may want to viosit the site and take a photograph and then change the view settings in ArcMap to recreate the optics of your photo as shown in the example below.
The example also shows how a we can selectively remove buildings form our builsings layer. Google Earth is a browser and authoring tool for georeferenced web content.
KML and google earth provide many capablities for modeling sites as collections of georeferenced points, lines polygons, images and 3d models. We use this tool to export the buildings and the frame from your scene. Your clipped groundplan image can be imported directly into Google Earth and registered precisely using your model frame.
From the pulldown menu on the Draw toolbar, choose Convert Graphics to Features. When saving, be sure to set Save Files of Type to Shapefile. Name your new shape file something like frame. Export a Groundplan Image Zoom out to your context frame and measure its width in meters.
Introducing the ArcScene user interface
For the context image, you don’t necessarily need a very tutoria image. A good resolution for your context image tutoria be about a half-meter per pixel, which is good enough to see distinguish buildings, roads, cars, etc. Thinking about it another way, many programs like AutoCAD and Sketchup will choke if you try to drape a texture with more than, say x pixels So if your context image is more than 4 kilometers wide, think about that.
Arrange your map display to include the model clipping frame. Think about the sort of grapnhical hierarchy thou would want in a reference image that will be draped on an aerial photo in your model.
GIS Manual: Beginning a 3D Modeling Project in ArcGIS
You may want to use other overlays with transparency to colorize the photograph or to include details for some other GIS layer that you have. In the Export Map Dialog, you should check the option to Save World Filewhich will save some georeferencing information for the image.
For Location choose your data folder. Save your clipped elevation model as a tiff or an Imagine Image format. Export your Buildings to a New Shape File If necessary, tutorixl to the bookmark you saved for your model tutorila. Save your buildings as a shapefile in your data folder. Add your clipped DEM and your buildings and your groundplan. Fix it Symbology properties of your groundplan, setting Stretch to none as discussed above. Inspect the model to see if it makes sense.
Note that arcscene offers a special box for adjusting the resolution of your exported image in the View Size box at the bottom left corner of the export image dialog. Note that if you het a cryptic error message when you try to do this it is probably because you need to change the File Type from geodatabas feature class to Shapefile. Use the Add Data button to add your new point shapefile to ArcScene. Adjust the Base Height property of your point so that it shows up on the surface.
Go to the symbology properties tab for your point shapefile and investigate the multitude of 3D symbols that you can find in the Style References.
Note that you can adjust the size and rotation of symbols. You can use the Advanced symbol swettings to read the height for each symbol from an attribute. Shift-click to select more than obne building. Name this layer Removed Buildings Turn off your Groundplan so that you can see the building shapes.
Adjust the properties of your new building to set their base heights and extrusion. Open your geoprocessing toolbox by clicking the little red toolbox icon on ArcScene’s toolbar.
Export your Clipped Buildings layer. Make sure that the Clamped to Ground option is unchecked. Export your Frame polygon with the Clamped to Ground option checked. Your Groundplan image can be added to Google Earth as am Image Overlay note that your frame polygon will make it very easy to register this overlay.