Methods to obtain high-precision scaling

[Julien_VDM]

Hi,

We seek to optimize our surveys of inspection projects requiring high-precision scaling.

Aside from using a theodolite, which are consistent methods for accurate measurements on a building facade or any sort of vertical infrastructure ? The goal is to obtain a centimeter scaling.


Thank you in advance for your answers.

[Kiesel]

Hello Julien_VDM,

first question is which version of PhotoScan/Metashape you are using.

If you have  PhotoScan/Metashape Pro and a workstation at hand you can easily signalise CPs (control points) on your building and measure them. Save the measured coordinates as txt-file. In PhotoScan/Metashape you have to measure them as markers by giving them the same name as before and after that import the txt-file in PhotoScan/Metashape. After all CPs are defined as markers don't forget to hit actualise!
If you don't  have a workstation at hand you can also measure some BIG distances with a measure tape and can define scale bares in PhotoScan/Metashape which should be perpendicular to each other (I recommend at least two vertical on each side, left and right and two horizontal one low and one high).

You can't  scale in standard version, only with third party tools which is less accurate.

For more how to do it see manual and tutorial section.


Hope it helps to start