Set analysis parameters for surfaces

00:06

In this video, we're going to talk about one specific surface analysis.

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We're going to go set the parameters for that surface analysis.

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And then we're going to apply those parameters to that surface analysis.

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So what we're going to first do is we're going to jump over to our Toolspace window in our Prospector tab,

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and we're going to go ahead and right click on our EG surface, into Surface Properties.

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Inside of Surface Properties, we're going to navigate to the Analysis tab,

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and then we're going to dropdown the Analysis type and select a Slope analysis.

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Inside of our slope analysis, I'm going to define five specific ranges,

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and then I'm going to hit my arrow down to populate those ranges into my range detail window.

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When I'm working with surface analysis,

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what I like to do is I like to make sure that all of my ranges are shown in the Range Details window rather than having to scroll up and down.

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So what I do is I expand the Surface Properties window and tell all of my ranges are shown.

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Inside Civil 3D, once you've specified your ranges, Civil 3D looks at your surface and populates your minimum maximum slope,

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doesn't necessarily evenly distribute those slopes,

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but it does define your minimum slope in the first range and your ultimate maximum slope in your last range.

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So this is contained inside of your statistics.

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If you look at your extended statistics for slopes, we have a minimum grade slope of 0 and a maximum grade slope of 43.43.

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And if we look at our Analysis tab, we see we have a minimum slope of 0 and a maximum slope in our last range of 433.4269, which rounds to 433.43.

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So what I'm going to go ahead and do is I am going to specify my minimum and maximum slopes, but spread the ranges out a little bit more.

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So what I'm going to go ahead and do is change my first range to be between 0 and 10.

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And then when you move on to the next ranges, what you always have to make sure you do is have your minimum slope below your maximum slope.

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You'll return error if you try to set minimum slope larger than your maximum slope in that range.

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So if I say my minimum slope is 10%, but I still have my maximum slope at 2.0647% and I hit "Enter",

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Civil 3D will return an error that says minimum value must be less than the maximum value.

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So I'm going to go ahead and click "OK".

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I'm going to choose my new maximum range for this area, which I will go up to 50% slope.

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And I will set my minimum slope as 10%.

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Then I'm going to move onto my next range.

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I will set my next maximum slope at 125%.

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And then I will set my minimum slope as 50%.

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Then I will move on to my next range and I'll set my maximum slope as 250%.

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And I'll set my lower range, my minimum in that range as 125%.

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And then I'm going to move into my last range and set my minimum slope as 250% and then I have my maximum slope set at 434.4269%.

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So what I'm going to go ahead and do now is I'm going to "Apply" them and say "OK".