So in this demonstration, we're going to work with a little bit of
the three-dimensional tools that are accessible to.
Now obviously the geography itself is,
mostly emphasized and most of this class has emphasized the x and y position of
features on kind of the cartesian grid or even a spherical surface.
But we also do have that vertical axis as well.
We've worked with this with the DEMs.
We've worked with this with the tins.
And it's nice to be able to visualize these in a way that is three-dimensional
to make use of some of the modern computer technology that we have to
render these things virtually in three dimensions.
So the data that I've provided for
you to do this comes from a lot of the other demonstrations that we've done.
So you don't necessarily have to use the sample data that are in here, and
there's quite a lot of them, just to show off a few of these and
how they might work in three dimensions but
the first thing you're going to do is, as usual, start up ARC GIS.
Once you have it loaded the next thing we want to do is
actually leave ARC GIS behind and work.
Is a two dimensional, or three dimensional viewer that kind of
Doesn't take into account the spherical nature of the Earth in quite so
good of a way, in quite so systematic of a way.
That's because it's not designed for things that are on the continental scale,
things where it might be really important to see it that way,
that's ARC globe, you can experiment with that on your own but
that's what you'd want to use for more of a kind of Google Earth feel.
Now to get into our arc scene in ARC globe you can get to them through the start menu.
What I'm going to show you here is getting to them from arc map itself.
So simply right-click up here some place.
Make sure your 3D analyst tool bar is on.
If yours is already on then don't do this.
But if it's not go ahead and turn it on so it looks like this.
If everything is grayed out over here you would just wanna go to Customize,
Extensions, and check on 3D Analyst here.
Once it's in place,
just choose this one over here this will launch ArtScene for you.
There's also launching ARC Globe if you want to experiment with that later on.
Let's use ArcScene.
What ArcScene is, is essentially this three dimensional viewer.
It's fair to think about these things as actually not
being totally three dimensional.
It's more being two and half dimensional.
So a surface will have, it'll basically be the surface of something.
You would be very, very hard to represent a cave or anything that has multiple Z
coordinates for a single X and Y location within the same layer.
So, the way we're gonna work about these, work through
these things means we can then drape other layers on top of existing layers.
We can extrude things up and down.
And we're gonna experiment with all of these during this demonstration.
There's not a lot of analysis that happens in here
there is quite a bit of visualization.
So, once it comes just choose Blank Scene here.
I know mines cut off on the bottom here, I'm going to have to move it around just
a little bit too conform to the same size window that we've but working with.
So just bear with me for one second.
So you should have something that looks vaguely like ArcMap does.
So we have our sort of general toolbars across the top.
Instead of our table of contents having just layers we have scene layers.
We have a few other things that may not look as common with navigation but
just as usual, we're going to choose our add data.
And at this point, you can work either with a TIN or a DEM.
Anything that has an elevation associated with it.
Now, the gates to your demo 13 data or your TIN, wherever it may be.
If you do break into DEM and I'll demonstrate this in a moment.
There's gonna be one additional stage that has to happen.
But here go ahead and bring in your TIN.
And immediately you should You can see that it brings it in, in three dimensions.
So this first tool, if that's not your default, is Navigate.
And that's gonna allow us to kind of drag it around.
Now, I've already mentioned many times and
it should come as no surprise to anyone that has come to Notre Dame.
Northern Indiana is pretty flat.
So, what we're seeing here.
This is it, in three dimensions, but it only varies a few meters over the entire
region that we've been working with.
So, the fact that it's very.
very flat is actually accurate.
If you get really in there, you can see that there's a slight difference between
the river and [INAUDIBLE].
So, if for
some reason your TIN has come in without being able to see elevation here, you can
always go into the Layer Properties, just like you would elsewhere in the Symbology.
You can turn on elevation, as you would with a TIN.
So if you need to show some other aspect of the TIN, the way you do it is exactly
the same as what's demonstrated in the module one topography.
Otherwise, just for our own gratification and visualization,
we may want to go ahead and put in a vertical exaggeration on here.
And we do that by double-clicking on Scene Layers or right-clicking and
choosing Scene Properties.
Now in our vertical exaggeration drop down we have a lot of different settings,
we can decrease it, or we can make it up to ten times.
Let's just chose ten and hit Apply.
You'll see that it changes it quite a bit.
If we come out and chose our full extent, we can now see that over there.
So this is ten times the exaggeration, it gives us a better idea kind of
thinking about what the topography looks like, even if it has been exaggerated.
Now your navigation tools, as I already sort of mentioned,
are a little bit different than they were in ARC Scene, ArcMap.
Our full extent is still the same, though it does change the orientation as well.
The regular navigation tool will allow you to sort of move yourself around,
the mouse wheel zooms you in and out.
Right mouse clicking will zoom you in and out as well.
Holding down the center button will allow you to kind of pan, and
now you have a new access axis point.
So A-X-I-S.
So that will sort of let you rotate around an individual point,
whatever's in the center of the map.
You can also do things like center on a particular target.
So if I click right here that's now my center point.
If I go back to navigation I can rotate around it.
Same thing I can do next over here called set an observer.
This will zoom to as if I'm sitting,
standing on the surface looking at from that one particular spot.
So I can move myself around a little bit like that.
I'm going to go back out to full extent
because one of the more fun ones here is this fly tool, this bird tool.
That you see here.
So, it's gonna say a little bit of description on it.
I can hold shift to maintain a constant elevation and
press escape at any time to stop movement.
But basically what happens is when I first bring it up,
you see my bird is sitting on a rock there.
I promise you that is supposed to be a rock.
And if I click with my left mouse button, it's gonna start me flying if I and
every time I click, I'm gonna go a little bit faster.
If I click with my right mouse button, it's going to slow me down a little bit.
And this is gonna show up in the bottom of the screen over here.
I can't gesture to it while I'm actually working, flying,
because I won't be able to do anything but fly.
So once I click once you can see the fly speed in the bottom left there.
It's currently zero so I'm just hovering and
sort of moving around as if I was flying.
Once I click once I'm now moving very slowly.
Fly speed of two, three, four, five,
I get to five I'm gonna right click and slow down.
And then I can begin to sort of fly interactively through my system here.
So I'm flying along the St. Joseph river here with an exaggeration of ten.
Feels something like the Grand Canyon or something out of Star Wars.
So if I start right clicking I can go back down to a zero.
Once my bird is back sitting on that rock,
I can now go back out to all my other tools, navigate, and zoom around.
So I encourage you to experiment around a little with flying and this will be
particularly useful a little later on when we're doing, rendering videos from these.
So a few of the other things that we can do with the three dimensional surface is
begin to put things on top of them.
Or to deal with other types of layers in 3D.
So I'm gonna go back in to add data.
If you remember from one of the earlier ones, we had a series of GPS points.
So I'm gonna add that in.
And these GPS points, if we open up the attribute table, right click,
open up attribute table, have an x and y coordinate, and then an elevation.
So what I wanna do is tell the computer to put those things at that elevation point.
There are not z Aware files.
It just means that elevation is in there somehow, in the actual attribute table.
So I'm gonna double click on it and I'm gonna go over in my layer properties you
see I've suddenly gotten a lot more tabs in my layer properties, including things
like base, heights, extrusion rendering, a few other things in here.
Now I'm gonna go to base heights, but I'm gonna say, down in elevation from
features, thatI have a con, I have, I have a constant value, or expression, for elevation.
And if I go into the calculator, it is the elevation out of the attribute table.
So it's gonna go through, for each feature it's gonna find what that elevation is,
and it's gonna put that point up at that location.
So that's something that has z coordinates in it,
even if they're not intrinsically part of the file.
And what would I do if I had something that was a vector data that didn't have
z coordinates with it?
And what I'm gonna show here is doing this with the drainage paths.
So go ahead and add in Michiana drainage paths from the hydrology demonstration.
So you see it's a lot bigger, for one thing.
And it's a whole lot of lines, all of which are at zero right now,
because there is no elevation associated with them.
Now what I can do is to move these up to be on the surface of the TIN.
So I'm gonna go over back to the base heights tab in the layer properties and
I'm gonna choose floating on a custom surface.
The only option that I have is the TIN Notre Dame.
So I'm going to hit apply, and
what you're going to notice is that a lot of them disappear and that's
because anything that doesn't have a base height is just not gonna render.
So anything that's off of that surface is not being rendered.
It's on the wrong tool there.
But anything else has been sort of dragged up is draped across the surface there.
Now in contrast to some of the, to get in to arc map.
If I move things around on my table of contents, it doesn't change anything.
I can't orient one thing on top of another by dragging it around the table
of contents.
I can also work with extruding different layers so
that's sort of stretching them up so that they're a little more visible.
If you notice right here, sometimes the drainage paths are kind of lost.
The geometry is just such that it overlaps it a little bit.
So I'm gonna go ahead and extrude one of these up or down.
So I'm going to go into Extrusion tab for
drainage paths, and I'm going to extrude the features in this layer.
And I'm just going to put them up we'll say five meters and hit Apply.
So it'll run in the background and you see now that lines have become walls.
They've been sort of stretched upwards.
I could do the same thing with GPS points.
So the points then become kind of pillars.
If you sort of zoom in on them you can see they're kind of pillars pointing up now.
Now there's a few other things that I can do in here as well.
I've put these as just sort of being five, I can do negative
as well if I was really interested in what was happening underneath it.
But if I add in one other layer, which is this Notre Dame Castle here.
This is a polygon layer and if we open up the attribute table for
it, you'll notice that each one of the features has a height associated with it.
So I can actually tell it to extrude it based on that height field.
So the first thing I'm gonna do is turn off some of these other guys.
I'm gonna go into the Layer Properties from my castle.
First I'm gonna tell it to float it up onto the tin, so
the base height is going to be the tin.
I'm gonna go over to Extrusion, I'm going to extrude the features in this layer.
I'm gonna use that calculator over there to say extruded up to height.
So whatever it is in that field, I'm going to bring it up to that.
And what you'll notice is that we now have a castle.
Where some things are extruded up quite a bit, other things are not.
So there's a few in there that I left as zero, those you can extrude up or
down as you go.
In fact, I can actually do a lot of that even right in here.
So there's ones that have a height of zero.
I could select them, I could do my field calculator within here, make them four.
And by the time I'm done, they've already been extruded up,
because it's just looking at those values, sort of, as it goes.
So that's a good way to create kind of simple architectures.
Obviously this is sort of a very fancified version
of a castle based on the Hesburgh Library here at Notre Dame,
where some parts of it have actually been increased in size quite a bit.
So if you want to experiment with this you would do most of the editing of
the polygons in ArcMap, and then you would simply bring them over into ArcScene.
Now the very last couple of things that I want to show you first I'm gonna
just show one other data type.
Bring it in, I'm gonna turn off everything else that's in here.
And you'll notice that I did give you a DEM.
And I want to just show you what happens if I bring in a DEM.
Now remember when I brought in the TIN it automatically floated it right up to
the surface.
It had the topography in there accurately.
The DEM, the computer has no way to know that it's not just a one band image.
So it doesn't immediately bring it up and
create a three dimensional surface out of it.
So to create that three dimensional surface I need to go in to it.
Go to base heights, and just set itself as it's floating on a custom surface, and
that'll turn it in o a three dimensional surface.
So, just like the tin, they should look remarkably similar,
they actually overlap quite a bit in there.
Now the other thing that you might want to do is to drape a one raster layer over
one of these things, and I gave you one example of that too.
And that's this Notre Dame land sat so this is a land sat image from 2000.
It comes in at zero there's nothing height associated with it, it would be very very
hard to get that up to the level and show it in three dimensions.
Unless I go in and float it, either over the TIN or over the DEM.
I'm gonna float it over the TIN, and then turn off the DEM.
So, now what I have is a three dimensional version.
With an actual surface of it,
I can see that sort of library castle where it's supposed to be.
In fact I could change it so this renders a little bit more cleanly.
It's actually downgrading it just to throw it in three dimensions.
If you ever wanna change how precise it looks it's over in the Rendering tab here.
And you just are simply gonna change it up to be High for the Quality Enhancement.
So that makes it a little bit nicer looking.
And I can go ahead and just have that in place, showing me everything in 3D.
So one of the neat things about this stuff is you can create an image in 3D,
and then you want to get it rendered out into something that you can use in
a presentation, or a video that you could use online or show to your friends.
We do all that just like we did with two dimensional stuff in file,
it's going to yell at me briefly, export scene.
Choose 2D and
this is going to export just a basically a screen shot of that one spot.
Probably do a jpg or something like that and
it'll export that one little piece that you see here.
You could also do the export 3D.
The only option that you have in here is what's called a wrl file, vrml.
They're not particularly useful in a lot of other three dimensional
viewing programs, so it's actually quite hard to get these things back out from
Arcsin into something like AutoCAD.
So be careful with trying to use those for anything other than a visualization.
The last thing that's really neat that you can do is actually record videos.
And this is probably the most useful part of the three dimensional viewers.
We can go in and if we right click up here and choose our Animation toolbar,
we have the ability to basically, open our animation controls and start recording.
And this is gonna record whatever we view at that moment.
So, whatever's happening in the image, is going to be recorded.
So once I hit record, I can go over to my bird tool.
I can do a nice little fly by Of Library Castle here.
Let me speed it up just a little bit.
Go all the way back down to zero.
Stop my animation.
And now I can just play that back as many times as I want to.
If you don't have a steady hand it might end up being a little bit shaky.
There's probably better ways to deal with it.
Now once that's done and in place, I can just go into the Animation toolbar here.
Go to Export Animation.
Spit it out.
It's gonna only be able to spit it out as an AVI.
You could use some other program to convert that into
another file format if you needed to.
Hit Export.
It'll ask for some settings.
Then it'll run through that video, taking a certain number of shots and
turning it into a video.
So I encourage you while this is happening, don't check your email.
Don't load up something private, because there's a fairly decent chance that
that'll make it into like a screenshot in the middle of your video.
So just let it run as is, probably don't record very, very long ones cuz it'll eat
up your computer for awhile and make pretty enormous files.
So once that's finished going, it's not gonna tell you that it's saved but
it has, so now I could easily go to the desktop where I saved mine.
Load up that new video file.
And sure enough, I have a nice little video that I can insert into my
assignment, or show someone online.
So that's really it for the stuff that you might want to do in three dimensions
using GIS data, obviously there's probably quite a bit more that you can do,
you can get very, very complicated animations put together.
You can control how things are, sort of, rendered one on top each other.
So, if you want to play around with it, please do.
Do not hesitate to ask me any questions that you may have.
Thank you very much and have a good day.