Re: Surface Analysis: I want a specific number of intervals

cwr001 · ‎12-06-2021

Hello,

I'm in need of some guidance with surface analysis - somehow I'm unable to achieve what I want and I don't really understand how they are supposed to work. I'm working with Civil3d 2021.3 but was able to reproduce the issue in 2022.1.1

I have a surface that I want to stylize with a fixed number of classes/intervalls.

In my surface-style I've set "Create ranges by" to "Number of Ranges", "Group by" to "Equal interval" and "Number of Ranges" to "10".

Now I enter the "Analysis"-Tab of my surface properties and under "Ranges", "Create ranges by" --> "Number of ranges" --> "10" I add them via this arrow-button.

However: 11 ranges are added, not 10:

If I play around I get weird results:

Number of Ranges: 0 --> It works, zero ranges.

Number of Ranges: 1 --> It works, one range.

Number of Ranges: 2 --> It works, two ranges.

Number of Ranges: 3 --> Doesn't work: four ranges

Number of Ranges: 4 --> It works, four ranges

Number of Ranges: 5 --> Doesn't work: six ranges

Number of Ranges: 6 --> Doesn't work: seven ranges

Number of Ranges: 7 --> Doesn't work: eight ranges

...

I don't know where I'm doing something wrong and I'd need this to work reliably.

(I'm planing on pasting my surface-analysis definition with the functionalities of the UK-countrykit tools but it doesn't work because the number of ranges-value doesn't come across correctly.)

declan_g · ‎12-06-2021

I have always used Range interval myself. But if you really want 10 ranges with equal interval you can see your max minimum levels so divide the level diff of max min by 10. Set this as your Range Interval and set the Base elevation as your minimum level.

cwr001 · ‎12-06-2021

Thanks for the reply! Unfortunately I'm not using intervals with a fixed range (the screenshots are misleading) but something like this (nothing displayed between -0.01 and 0.01, small ranges close to zero, large ranges for min and max):

(On this screenshot you can see my issue: I've created the surface, imported the surface display settings and an additional, useless region is added (the max elevation of my surface is 0.201, so this range is completely empty) because Civil3d seems to be unable to just add 10 regions.)