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Thread: Level Heads

  1. #1
    Revit Guru gregcashen's Avatar
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    Anybody know of a reliable method to change the level heads to show NGVD elevations. I created a custom level head with a text field that says NGVD and shows the elevation in +12.0' notation, but it only works on one side...i.e. it doesn't mirror properly. The text flips to the other side of the level head, or it mirrors about the level line...

    Thanks,
    Greg

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    Early Adopter sbrown's Avatar
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    Default Re: Level Heads

    If you want it on the other side you have to check the box on that side, if you just drage your head it will flip wrong. click on the level line and check the box.
    Scott D. Brown, AIA
    Senior Project Manager | Associate

    BECK

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    Revit Guru gregcashen's Avatar
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    Default Re: Level Heads

    I am checking the box.

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    AUGI Addict christopher.zoog51272's Avatar
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    Default Re: Level Heads

    Quote Originally Posted by FreeRangeMonkey
    I am checking the box.
    post your file freebie, and we'll take a look at it
    Chris
    SOM | New York

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    Revit Forum Manager Steve_Stafford's Avatar
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    Default Re: Level Heads

    I've seen this behavior too, in the the Level Head family when I attempted to add "ELEV:" in front of the value...

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    Revit Guru gregcashen's Avatar
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    Default Re: Level Heads

    Here it is...

    BTW, I would also like for it to have a "+" or "-" beside the value based on elevation relative to NGVD...any ideas?

    Thanks,
    Greg Cashen
    Attached Files Attached Files

  7. #7
    I could stop if I wanted to Dean Camlin's Avatar
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    Default Re: Level Heads

    All right, I'll bite: what does NGVD mean? New Grade Value Drop? Nearly Great Vehicle Design? No Good Volume Damper?

  8. #8
    Revit Guru gregcashen's Avatar
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    Default Re: Level Heads

    National Geodetic Vertical Datum of 1929

    What is NGVD 29?
    "The National Geodetic Vertical Datum of 1929: The name, after May 10, 1973, of (the) Sea Level Datum of 1929." (Geodetic Glossary, pp. 57)

    "Sea Level Datum of 1929: A vertical control datum established for vertical control in the United States by the general adjustment of 1929."

    "Mean sea level was held fixed at the sites of 26 tide gauges, 21 in the U.S.A. and 5 in Canada. The datum is defined by the observed heights of mean sea level at the 26 tide gauges and by the set of elevations of all bench marks resulting from the adjustment. A total of 106,724 km of leveling was involved, constituting 246 closed circuits and 25 circuits at sea level."

    "The datum (was) not mean sea level, the geoid, or any other equipotential surface. Therefore it was renamed, in 1973, the National Geodetic Vertical Datum on 1929." (Geodetic Glossary, pp. 56)

    ...ask and ye shall be answered!

    Most of the projects we do here are in the 100-year flood plain...we use NGVD to establish flood clearance heights.

    Greg Cashen

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    100 Club JTF's Avatar
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    Default Re: Level Heads

    Had the same problem when I first downloaded 5.1.
    Checking the opposite box did not work right.

    I had created a left and right level head with text on left and text on the right of the level head and it worked good.

    Then one day, not sure how the level head worked by checking the other side as it should work.

    Strange but true.

  10. #10
    I could stop if I wanted to Dean Camlin's Avatar
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    Default Re: Level Heads

    What is NGVD 29?
    "The National Geodetic Vertical Datum of 1929: The name, after May 10, 1973, of (the) Sea Level Datum of 1929." (Geodetic Glossary, pp. 57)

    "Sea Level Datum of 1929: A vertical control datum established for vertical control in the United States by the general adjustment of 1929."

    "Mean sea level was held fixed at the sites of 26 tide gauges, 21 in the U.S.A. and 5 in Canada. The datum is defined by the observed heights of mean sea level at the 26 tide gauges and by the set of elevations of all bench marks resulting from the adjustment. A total of 106,724 km of leveling was involved, constituting 246 closed circuits and 25 circuits at sea level."

    "The datum (was) not mean sea level, the geoid, or any other equipotential surface. Therefore it was renamed, in 1973, the National Geodetic Vertical Datum on 1929." (Geodetic Glossary, pp. 56)
    Thanks, Greg. I'd never heard of that. I hope my surveyors have.

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