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Imported OS background bigger than coordinates.....

32 REPLIES 32
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Message 1 of 33
Billy_Burg
1153 Views, 32 Replies

Imported OS background bigger than coordinates.....

Hi All.

 

I am not entirely sure that the 2 points below are connected but it does seem like a coincidence.

 

  • The linked DWG in our model has been scaled to +1000. This has been done to convert if from meters to millimeters since that is our default unit.
  • The problem I have is that when plotting various coordinates it is not showing the correct location. The distance is a lot closer and is the difference of about 1000. E.g. Onsite distance = 300m ---- model distance = 3000mm
  • We have since modelled pipework, structures etc.

Is there a way of scaling the coordinates to match the imported background?

Or a way for the coordinates to recognize this difference? 

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32 REPLIES 32
Message 2 of 33
jay_colcombe
in reply to: Billy_Burg

Apart from changing The Project Units settings I cannot see another way of doing this!

I would simply bring the OS in at 1:1 using the import unit settings and change the project units to match if required!

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

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Message 3 of 33
barthbradley
in reply to: Billy_Burg

Explain what you mean by "plotting various coordinates".  

Message 4 of 33
Billy_Burg
in reply to: jay_colcombe

Re-importing the OS background at a 1:1 scale is certainly an option but our last one since we have modelled a lot already.

Message 5 of 33
Billy_Burg
in reply to: Billy_Burg

For example if I go to the annotate tab > spot coordinate - to annotate areas where I want to show coordinates.

Message 6 of 33
jay_colcombe
in reply to: Billy_Burg

What i was referring to was that the OS needs to match Revit  - a meter in Revit should be a Meter in the OS so the same scale!  (Even if the units are not the same mm or m)

 

To try and clarify as to prevent lots of posts

Have you drawing  everything in Revit at the right scale?  So 1mm = 1mm?

 

If so you can edit the Units of the Spot Coordinates to suit

jay_colcombe_0-1699459767788.png

 

 

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
Message 7 of 33
barthbradley
in reply to: Billy_Burg


@Billy_Burg wrote:

For example if I go to the annotate tab > spot coordinate - to annotate areas where I want to show coordinates.


 

What's the Coordinate Base of the Spot Coordinate? 

Message 8 of 33
Billy_Burg
in reply to: barthbradley

Survey point.

Message 9 of 33
barthbradley
in reply to: Billy_Burg

Survey Point Marker and Survey Point ORIGIN can be at two different locations.  Perhaps you unclipped and moved the Marker away from the Origin.  

Message 10 of 33
Billy_Burg
in reply to: Billy_Burg

Hopefully this gives a bit more clarity. The image shows the edge of a walkway. The 2 coordinates shown on the right should not be near each other. Coordinate N50.357 E-4.834 should be on the opposite corner bottom left. The length of this distance in the model is 10000mm but the distance between the coordinates is 0.1. Bit confused!Edge of pontoon.png

Message 11 of 33
barthbradley
in reply to: Billy_Burg

Post the file.  

 

BTW: how far from the Project Internal Origin are your elements?  

Message 12 of 33
jay_colcombe
in reply to: Billy_Burg

in this model i know that i am using Millimetres as this is the Base Units for this Template so it is recording 800mm for the Pile Cap which is 800mm in width so i know this is correct but my Spot Coordinates (for the Survey Point) are set to Metres - does this happen with your model?

jay_colcombe_2-1699461998032.png

 

 

 

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
Message 13 of 33
Billy_Burg
in reply to: Billy_Burg

The OS background we use is in a DWG format which is linked into the RVT model.

Message 14 of 33
Billy_Burg
in reply to: jay_colcombe

Ok. So units used in our template for length is mm under the common discipline. This is why it shows 9000mm on the side of the snapshot shared before which is correct. No it doesn't show that because (I think) I have set the spot coordinate property to mm.

 

settings.png9000mm.png

Message 15 of 33
barthbradley
in reply to: Billy_Burg

Spot Coordinates report accurately on my end. 

 

Moved Survey Point Marker to Survey Point Origin:

 

SP at Origin.png

Message 16 of 33
Billy_Burg
in reply to: Billy_Burg

Hopefully this also explains. Not sure what you mean @barthbradley example.png

Message 17 of 33
Billy_Burg
in reply to: Billy_Burg

Another example of where the coordinates are in real world but not the same in our modelgrid reference finder.png.

  • Red = N50.357600 E-4.832417
  • Green= N50.357417 E-4.834033
  • Orange = N50.357400 E-4.834200
Message 18 of 33
jay_colcombe
in reply to: Billy_Burg

You need to reset your coordinates and start again as there is some incorrect information being shared between models and links.

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
Message 19 of 33
Billy_Burg
in reply to: Billy_Burg

One last ditch attempt at understanding what's going on with my model! Attached is a RVT with an OS Background linked into it (not changed). The walkway showing 2 spot coordinates are correct for setting out the walkway. This is where I want these 2 points to be. My problem is that now the model is too small for when I do dimensions and model elements in. Everything is too big for example when I draw a pipe or show a dimension. Have I lost the plot?

 

*****Apologies I gave the wrong coordinate unit before. I got confused myself and was using decimals instead of easting and northings. The easting and northing coordinates shown in the attached model are correct for what I want at these points on the walkway.

Message 20 of 33
barthbradley
in reply to: Billy_Burg

Coordinates are dead on ballz accurate using the Specify Coordinates at Point method. 

 

Help | Specify Coordinates Before Linking Site Data | Autodesk

 

Dead on Ballz Accurate.png

 

 

 

 

Note: this screenshot is using your first attachments.

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