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wings1080
Posts: 107
Registered: ‎07-18-2013
Message 1 of 6 (141 Views)
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Surface Range 2d Area

141 Views, 5 Replies
01-23-2014 10:40 AM

can someone please give me a definition of what exactly this is?  i just created a table but need to know what the numbers mean and googling is useless, see attached table, for speaking purposes, number 5 which is 43' to 44', what is the 12,164.09 area????

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neilyj
Posts: 3,670
Registered: ‎08-01-2008
Message 2 of 6 (132 Views)

Re: Surface Range 2d Area

01-23-2014 11:04 AM in reply to: wings1080

My understanding of these areas is that if you imagine a series of concentric circles the lowest value i.e.Number 1 represents the smallest circle. Number 2 represents the annular area between circle 1 and 2, Number 3 is the annular area between 2 and 3 etc.

 

Thus the area for Number 5 only represents the area between 44' and 45' (so for say a flood level of 45' the area flooded would be the sum of the areas 1 to 5) and the total of all the areas should equal the total surface area (2D)

neilyj
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Distinguished Contributor
wings1080
Posts: 107
Registered: ‎07-18-2013
Message 3 of 6 (123 Views)

Re: Surface Range 2d Area

01-23-2014 11:28 AM in reply to: neilyj
cool, thanks ... are you sure this is right? would like one more person to chime in on this unless you are sure

also, the topography is definitely not uniform as you describe in your example, there will be tiny little islands, 100's of them between certain elevation ranges, I am hoping it accounts for this, no idea how this could be be computed but i have faith in the great god of civil 3d
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neilyj
Posts: 3,670
Registered: ‎08-01-2008
Message 4 of 6 (111 Views)

Re: Surface Range 2d Area

01-23-2014 01:30 PM in reply to: wings1080
my example was just that to illustrate the concept. I'm pretty sure that all the little islands are accounted for- check the total adds up to the surface area. You could extract user contours and calculate the area between them.
neilyj
(No connection with Autodesk other than using the products in the real world)


IDSP Premium 2015 (mainly Civil 3D 2015 UKIE & Infraworks with some limited 3ds Max Design)
Win 7 Pro x64, 240Gb SSD, 1Tb HDD
32Gb Ram Intel Xeon CPU E5-2650 v2 @ 2.6GHz (32 CPUs), ~2.6GHz
NVIDIA Quadro K4000, Dual 27" Monitor, Dell T5610
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conormccartney3897
Posts: 164
Registered: ‎08-18-2010
Message 5 of 6 (98 Views)

Re: Surface Range 2d Area

01-23-2014 03:03 PM in reply to: wings1080
Yup Neilyj is right, for your particluar example, the area for number 5 is everything in your surface between elevations 43 and 44.
Distinguished Contributor
wings1080
Posts: 107
Registered: ‎07-18-2013
Message 6 of 6 (75 Views)

Re: Surface Range 2d Area

01-24-2014 06:11 AM in reply to: conormccartney3897

thanks guys

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