Surveying ME - BMEEOAFM201

Whose job is it? Architects or land surveyors?

What do we have?

• hardcopy plans
• digital plans, typical formats: pdf and / or dwg (dxf)
• 3D model, like BIM
  

Steps of developing a setting out plan

Classical method:

1. Simplification. Neglecting of those elements which are unnecessary for setting out.
2. Drawing the structures in an empty file. It is time-consuming while it offers a great opportunity to check the plans.
3. Localization of the building (structures). Most of the cases to the site boundary. A global, regional or local coordinate system is used? Map projection scale factor?
4. Compute figures for setting out: coordinates, offsets, angles ...
5. Preparing a documentation

An example:

• floorplan
• plan
• setting out plan
  

Modern method:

1. Plans are provided in digital format (e.g. in a dwg file)
   
2. Check out its coordinate system, dimensions. Transform it into the coordinate system of control points, if necessary
3. Putting points onto the digital plan
4. Generating a coordinate list of points to set out
5. Upload the list onto the instrument (e.g. total station, RTK GNSS)
   

More modern method:

1. Get the 3D (BIM) model of the structure (building)
2. Convert it into an appropriate format if necessary
3. Upload the model onto the instrument

Most common issues

• some missing dimensions
• the sum of the dimensions does not match to total dimension
• different values of the same dimensions on different products (plan vs. section)
• odd unit, false (insufficient or over) precision, especially in case of angles
  
• no control of dimensions
• lack of data to localization