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Thread: Survey and Base point

  1. #1
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    Survey and Base point

    Hi all,
    Can someone explain to me in real project terms how these 2 points should be used?
    From my understanding, which could be wrong, is that;
    Base point is a shared point of a building that is used as a reference? Is this also used in elevation to set the height of the model to a real world height?
    Survey point is a real world coordinate used when sharing models for coordination?

    Does anyone have any links that may be useful in understanding these.
    Sorry for the vagueness but for some reason I cant get my head around these.
    Thanks

  2. #2
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    that's pretty much it. i found this site informative about it all

    https://revitpure.com/blog/13-tips-t...rdinate-system
    RevitUser83 likes this.

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    RevitUser83 likes this.

  4. #4
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    Thanks both, very helpful

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    Quote Originally Posted by robp View Post
    that's pretty much it. i found this site informative about it all

    https://revitpure.com/blog/13-tips-t...rdinate-system

    What do you think about this part? I generally like that post/pamphlet but I don't understand the point of the offset.


    5- SET LEVELS RELATIVE TO PROJECT BASE POINT
    In most projects, it is a smart move to set the project first level at 100'-0'' or 10,000mm. This is an arbitrary value that has no relation to the sea level. The best practice is to set this value in relation to the Project Base Point. Select a level, click on Edit Type and make sure that the Elevation Base is set to Project Base Point.

    These four posts from Steve Stafford are comprehensive and a great resource:
    2015 Survey Point - Post 4 - Acquiring Coordinates and View Orientation
    2015 Survey Point - Post 3 - Five Minutes with Shared Coordinates
    2015 Survey Point - Post 2
    2015 Survey Point 1
    Last edited by user_josh; May 13th, 2019 at 08:12 PM.

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    Moderator DaveP's Avatar
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    We set our First Level to 100'-0" because we have levels below that. Foundation, Basement, Parking.
    We don't want anything below grade to have a negative number.
    bryangrzonka likes this.

  7. #7
    Forum Addict GMcDowellJr's Avatar
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    I worked with a young architect once who lost their mind when I did this in a project... they’d never seen it before and assumed it was wrong. :shrug:

  8. #8
    The Moderator with No Imagination MPwuzhere's Avatar
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    While my template has Level 1 at 0'...this can be changed accordingly if using actual heights. I also keep a Site Level at 0' which should never be changed and which the topography is created from. Of course then users need to change Level 1's height. I had some users that did not like the Site Model and Project Model process.

  9. #9
    Forum Co-Founder Twiceroadsfool's Avatar
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    Quote Originally Posted by GMcDowellJr View Post
    I worked with a young architect once who lost their mind when I did this in a project... they’d never seen it before and assumed it was wrong. :shrug:
    I wouldn't lose my mind over it, but its an opinion matter: If someone asked me, i would tell them "i thought it was wrong," too. Ive heard all the reasons for it, and i hate them all, and find them to be nonsensical. L1 is 0-0 for me.

  10. #10
    Forum Addict GMcDowellJr's Avatar
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    Frankly, if it was my company, I'd use the survey elevations with dimensions between them in section in case you were bad at math.

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