Simple 3D Coordinate Workflow?

GPS/GNSS
1

Hi all. I’m a beginner, so please forgive how basic a question this probably is.

I have an application where I need to measure a handful of rectangular surfaces in relation to a specific origin. I basically need to know the position of the corners of each surface in 3D space. The surfaces will all be tilted in different ways, but I will be able to walk to them. I don’t need incredibly high accuracy (within 10cm is fine), and I’m only interested in the difference between the reference point and the corners of those surfaces. The goal is to be able to put points into a 3D modeling program (such as Blender) to be able to get a model of them into an OBJ.

If I use a GPS receiver with correction, I should be able to get the accuracy needed. What I don’t understand is how to capture the points and then use them. I think if I use a software (like SW Maps) I should be able to capture points. But then I’m not sure how to transform those points that are referenced to the Earth into something that’s a lot more local.

Is this even possible, or am I trying to use a system that’s designed for the wrong thing? I am having a bit of trouble figuring out how to proceed on my research, so any tips would be greatly appreciated!

2

Welcome to the community @jkoffman ,

For GNSS, would the antenna have a good view of the sky when it’s located at each of the corners of the surface (and center) that you want to model ?
IE: Will the target surface (or anything else) block the satellite signals ?

3

Are elevations important? To what degree of accuracy? Is this a small or big object?

4

Hello, if you don’t need high precision and the areas to be measured are relatively small, I recommend setting the UTM projection for your area in SWmaps. When you export your data, you’ll have the x, y, and z values ​​for each point.
You’ll need to use the reference point you’re referring to.
You can process this data with any CAD program to calculate areas and volumes if that’s what you need.
There are free CAD programs.
To set your UTM zone, you do it in Project Settings, where it says Coordinate System.
I look forward to collaborating.
Best regards
Angel