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Which coordinate system in CE scene to integrate city in Unity scene with GPS points?

lina738

Dear all,

I am working with Unity and imported some GPS Points that include some environmental parameter. I want to add a city I build with CityEngine into my Unity scene. If I do so, the GPS points and the city dosen't fit. I think I would have to use a different coordinate system for the scene in CityEngine. Can someone tell me which one is the right one here?

Thanks a lot!

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Anonymous User

CityEngine uses WGS84 to bring the "GetMapData" in from OpenMapsData. It looks like it can also reproject in CityEngine to UTM and MGRS. Click the camera button and go down to View Coordinate System. If you have a projection outside of these 3 then you will have to go to Arcgis Maps (or Pro).

There are a lot of reprojection tools in Arcgis Maps. You will just have to make sure that your base map is projected to the same coordinate system as your gps points. I would reproject the GPS coordinates to WGS84. Then you can reimport that into CityEngine and go from there. Then export it Unity.

There might be several other workflows, but that is the one I would try. There is a beta version of Arcgis Maps (direct) to Unity, that might be worth a go.

lina738

Thank you for your help. In CE I have selected the coordinate system CE CS in meters - but it still doesen't fit.
I import the GPS data which is stored as csv-file directly in Unity and place some spheres on the GPS position. The proportions of the CE generated city and the GPS points do not match at all. The city is about ~10000 larger. If I compensate the size ratio by scaling, the GPS points still do not match the CE city.

I don't get it... :see_no_evil_monkey: Do you have an idea?

Anonymous User

Learned something new thanks to your question, and that's why I try. Turns out you can do reprojection in CityEngine to more than just those 3 in the camera settings.

https://doc.arcgis.com/en/cityengine/latest/help/help-georeferencing.htm

Go to Edit > Preferences > Scene to change the projection in CityEngine.

More importantly to answer your question, do you happen to know what datum your GPS receiver captured in? Knowing that might save you a lot of time. The default is usually UTM/WGS84, but it's possible yours was different.

To add to this: "The latitude and longitude of your current position are different for different datums. For example, the Cathedral in central Christchurch is at 172.63658E, 43.53103S in WGS-84 coordinates and 172.36344E, 43.53270S in Geodetic 1949 coordinates. If you are working with latitude/longitude coordinates and you get an error of a couple of hundred metres, you most likely are using the wrong datum."

If you don't know and you can't find out, try changing your scene's projection to these common projections and maybe you'll get lucky:

Projected>World>WGS84 Web Mercator
Projected>UTM>WGS84,<yourhemisphere>,<your time zone>
Projected>UTM>NAD1983,<your time zone>

lina738

Thanks again.

I changed the coordinate system in CE (it dosen't look like there is something changed when I am doing so), export the model, and import it in Unity. All the models dosen't differ at all. Looks like CE is ignoring the coordinate system change and also when exporting. Do I have to state this somewhere separately?

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