What EPSG code are my Geocoordinates?

If you have geocoordinates for your model or drawing, and want to locate them in cmBuilder, you need to know the  geocoordinate system your project is using. Here is a guide on how to figure that out.

1. Look in your drawing package.
2. Ask someone on your team.
3. Ask someone from the civil team.
4. Grab the most likely coordinate system.
5. Debug refinement with your model or drawing.

4. Grab the most likely coordinate system

For projects in the US (using state plane)

Most projects in the US use state plane coordinates. To find your state plane coordinate:

1. Search for "NAD83" plus your state/province
2. If your state has multiple zones, find your zone here: https://hub.arcgis.com/datasets/esri::usa-state-plane-zones-nad83/explore
3. Most projects use the original NAD83, with the code range between 2225 – 2289
4. Though some projects are using the newer "NAD83(2011)"

For projects in the US (not using state plane)

1. Search for "NAD83 UTM" plus the UTM zone that was already default in your project

For projects in Canada

1. Search for "NAD83(CSRS)" plus the UTM zone that was already default in your project

For projects in Australia

1. You will need to determine if you are using GDA2020 or GDA94, 2020 is more common, if so
2. Find your zone here: https://www.researchgate.net/figure/Map-Grid-of-Australia-MGA-zones-across-a-Australia-and-b-NSW_fig6_319454295
3. Search for the GDA you chose, "MGA", plus your zone, for example: "GDA2020 MGA zone 55"

For projects in the UK

1. Search for "27700" to select "OSGB36 / British National Grid"

For projects in the rest of Europe

1. Note that there are more specialty coordinate systems in Europe, so you may not be using this.
2. Search for "ETRS89" plus the UTM zone that was already default in your project

For projects in the Brazil

1. Search for "SIRGAS 2000" plus the UTM zone that was already default in your project

For projects in the Arctic and Antarctic

1. Search for "WGS 84 Arctic Polar"

For anything else:

• We have not determined a specific common coordinate systems for projects :(

5. Debug refinement with your model or drawing

If you have multiple coordinate systems that may be correct for you:

1. Add each coordinate system to your project.
2. Set one to "Use to geolocate".
3. Open/refresh your scenario.
4. Edit your BIM model.
5. if it says "Model geocoordinates lies outside the 3D map tile boundary." then it is not the correct geocoordinate, and you can skip step 6 for this coordinate system.
6. Select "Reset model geolocation" (if available).
7. Repeat with each coordinate system, until you find the most accurate model position from step 6.