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Elevation Benchmark


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Setting it so that it is set to zero is very simple:

- Place it on the drawing where you want the zero datum height to be.

- On the OIP look for the "Y' location value (At the very top of the OIP between the 'X' and 'Z' values).

- Enter this 'Y' height as the Reference Elevation.

If you don't want zero as the 'Reference Datum' just subtract the figure you do want from the 'Y' value.

- eg 15' Y value subtract 10' will give you a reference height of 5' making the Datum value read as 10'.

- The same logic applies below zero on the Y axis. -15' "Y' value subtract 10' will give you a reference height of -25' making the Datum value read as 10'.

A word of caution with this tool though:

- If you then move the drawing elements on the page after you have set these all of the heights will automatically change to reflect the new locations relative to the Reference Height you first set. eg if for example you adjust where the elevation or section is on the page to compose your sheet better. If you think you might do this use Convert to Group to make them static objects.

- If you move the origin or have moved the origin of the 2D drawing you can no longer use the 'Y' value for new Benchmark objects because it is no longer the correct value. The Benchmark objects still seems to 'remember' where the original origin was and calculates based on that. After you have torn your hair out adjust the Reference Height by trial and error until you get your datum set correctly. Once you have the first one correctly set use duplicates of this one for all the others you require.

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Kevin, are you ready for this. First, this tool works on an absolute fixed reference point (regardless of where you set the origin), so it's easy to use if you work from this absolute point. You can use it elsewhere by doing the following:

1-Put your 1st elevation benchmark where you intend the 0'0" to be making sure that the AUTO SET is on and the REFERENCE ELEVATION is at 0'0" in the preference window.

2-Take note of the elevation showing on your new benchmark, lets say it shows 5'3". This will be the new value you will input in the REFERENCE ELEVATION box in the preference window when you draw you next benchmark.

3-Before drawing your 2nd elevation benchmark, change the first in the OIP by un-checking the AUTO SET and entering 0'0" in the ELEVATION box.

Your 1st benchmark is now showing your intended 0'0" elevation.

4-Before placing your 2nd benchmark, open the preference window and make sure the AUTO SET is on and enter the original elevation of your 1st benchmark 5'3" in the REFERENCE ELEVATION box.

Thats it, every benchmark you draw will show the "corrected" elevation from the corrected original, just be careful you don't make any more changes in the preference window. I expect VW's programmed the tool to use only an absolute reference point so that the elevations wouldn't change if the drawing origin was moved. Whew!

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