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Volume in specified depth area - ist it possible and if it ism how to do it?

  • 1.  Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-13-2021 23:20
    Hi there!

    I have a surface and i want to report this surface like this (the bold text i dont know how to do):

    • Total volume - surface to surface
    • What is the area where the excavation is 0 to 1m - surface area report of the isopach.
    • The volume of the excavation 0-1m - i dont know how to do this in a easy way.

    One way to do that volume calculation is to do create contours on the isopach on 0 elevation and -1m elevation and use thoose lines as boundarys in a volume calculation but that is a lot of work and i wonder if someone has a workflow wich is easier. 

    Have a nice day!



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    Fredrik Bergstrom
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  • 2.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-14-2021 00:32
    Surface -> Earthworks Report -> Volume Breakdown by depth Increment


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    Marian Plucinski
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  • 3.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-14-2021 01:04
    That will not give me the correct volume, i dont really know how that function works but it gives me the wrong numbers. look at the picture below. As you can see i have only 479m2 surface (the picture above) wich is 1m or lower to excavate and if i do the same volume report as i did for the cut n fill and choose "by depth increasement" it will sa that i have 622m3 in volume. Thats more than 1m on that surface. So i need some other way. 



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    Fredrik Bergstrom
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  • 4.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-14-2021 15:47
    Frederick,

    I have never had a problem with Earthworks Report.

    How are you calculating your Area By Depth?

    You are looking at area by depth on the Cut/Fill Map surface, or is it ISOPATH surface?


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    Marian Plucinski
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  • 5.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-14-2021 21:13
    I wouldn't trust those surface areas in the surface info report.
    On a test I run it seems that the areas are delta values to the previous slice.
    In this example the area for the polylines should get bigger the higher I go. In the report they are all different, but added together the give me the area of the highest line.

    What you can do to verify the areas is to set the property "Drape surface" of the Isopach to "no", create Contourlines on the Isopach, explode those and check the stringline area in the properties pane.

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    Ronny Schneider
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  • 6.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-16-2021 22:58
    Thats becasue you get the area between the selected numbers, the example you show is the correct area. 
    Thats why i set my elevations in the settings from 2 to -2m with 1 meter in between. That gives me the area from 0 to -1m and the rest above shows under -2m in the table when taking the area for excavation from the isopach. I would say that they are correct. 
    My problem is that i still would like to get the volume for the excavation 0 to 1m depth.



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    Fredrik Bergstrom
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  • 7.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-15-2021 02:09
    Edited by Fredrik Bergstrom 07-15-2021 02:09
    Hi!

    Thanks for your answers! 
    A stupid question, the ISOPACH surface and the C/F-map surface, is that not the same? 

    Here is a video of how i am doing it. :)
    http://somup.com/crioQQYDmd

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    Fredrik Bergstrom
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  • 8.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-18-2021 14:44
    Hi @Fredrik Bergstrom,

    I might be wrong, but I have a ​funny feeling that you're comparing volume of 0 to 1m CUT with the area of 0 to 1m FILL.

    Any chance that you would share both your surfaces?

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    Marian Plucinski
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  • 9.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-20-2021 23:24
    Hi @Marian Plucinski :)

    Here is a VCL-file with my surfaces wich i am using for my calculations. https://www.dropbox.com/t/NQDmMK3p4GwancRC
    And here is a video (again) when i am trying to explain what i am doing with thoose surfaces.  http://somup.com/crir1XY0mO

    Probably i am looking at the wrong numbers in the reports and thats what is messing with my mind. When i am doing a surface info report and choosing 0 to -1 i look at the planimetric surface but i think i should look at the actual surface area. 




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    Fredrik Bergstrom
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  • 10.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-21-2021 01:37
    Hi again, take a look at this video and file instead. I did a comparisation wich is correct when doing it with an easy surface but it does not look the same when doing it on my surfaces, any idea why? 

    Have a nice day! 

    https://www.dropbox.com/t/hzi8PNM7Ib2uYisg
    http://somup.com/crirjwY0LW

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    Fredrik Bergstrom
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  • 11.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-21-2021 22:00
    You're right, it doesn't look right. 

    But I could not fault any of the functions using "Simple" models, I recon that multiple islands within islands are the reason.

    I would recommend as follows:

    Generate contours 0 and -1 on your CFM.
    Create closed polygons.
    Calculate volume and area within those polygons.

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    Marian Plucinski
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  • 12.  RE: Volume in specified depth area - ist it possible and if it ism how to do it?

    Posted 07-21-2021 22:25
    Ah, thats sounds correct and a problem wich i know exists. Volumes when its a island inside a island.
    Contours at 0 and -1, thats how i used to do it but i was searching/hoping for a more easy and faster way to do it but it seems like i have to do it that way. 


    Thanks for all your help! 😁

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    Fredrik Bergstrom
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