Surveying the right-of-way for a garden railway involves more than what is required for layouts in the smaller scales built indoors.
The tools one uses differ considerably as one needs to establish the existing topography.
How to start.
The following is a discription of how we surveyed our garden. While the general principals apply to any size and shape of project, you may want to proceed in a different manner.
1. While planning the layout we decided to use the south face of the house as the reference basis line.
2. A spot on the garage floor was designated as "0" elevation reference.
3. Rather than use a grid that covers the complete layout i.e. at 12" or 24" spacing, we use reference points which form a wide, irregular grid.
4. Triangulation is carried out using the track planning software.