topic how to fix georeference of imported .dae models or KML in/for CityEngine scene? in ArcGIS CityEngine Questions

how to fix georeference of imported .dae models or KML in/for CityEngine scene?

LessieOC — Fri, 18 Nov 2016 12:58:37 GMT

Hello,

When I import .dae models into a georeferenced cityengine scene they are placed at the origin. When importing kml models, they are offset. My scene is Geo-referenced already. How do I fix either, preferably the .dae imports?

I tried converting a (static) model to shapes but then it dissapears entirely. I have the same models in kml but they seem to come in with an offset, so also in the wrong place. I am using CityEngine 2015.2.

Also, how so you check the coordinate values of the model?

Sorry, not too experience with all of the above. Thanks for any help in advance..

Re: how to fix georeference of imported .dae models or KML in/for CityEngine scene?

ThomasFuchs — Fri, 18 Nov 2016 17:18:36 GMT

Hello Lessie,

For georeferencing DAE Collada files, KML is the way to go. The geo reference is added by the KML <Location> tag.

It specifies the exact coordinates of the Model's origin in latitude, longitude, and altitude. Latitude and longitude measurements are standard lat-lon projection with WGS84 datum. Altitude is distance above the earth's surface, in meters, and is interpreted according to <altitudeMode> or <gx:altitudeMode>.

For further information please consult the KML documentation: Models | Keyhole Markup Language | Google Developers

On import to CityEngine the KML lat-lon WGS84 coordinates are projected to the scene's coordinate system.
To narrow it further down, could you please answer the following questions?

Which scene coordinate system are you using?
How large is the offset? Is it constant?
Are the KMLs located correctly in ArcGIS Earth ?

Re: how to fix georeference of imported .dae models or KML in/for CityEngine scene?

LessieOC — Sat, 19 Nov 2016 00:11:34 GMT

Hi Thomas,

Thanks for taking the time to help me. The kml models are of underground objects and when I tried looking at them with Google E. they are not visible, but when placing the push pins they seem to be on the right area. I am not using WGS1984 in my cityE. model so that explains their shift. The shift is consistent. How how do I change their projection within the cityengine? My scene is in epsg: 28992. I can't easily find a 'reproject' option. Alternatively, how do I assign a CRS to the .dae models? There are about 50 objects. Or, what else do you think I can I try.

Thanks,

Re: how to fix georeference of imported .dae models or KML in/for CityEngine scene?

ThomasFuchs — Mon, 21 Nov 2016 12:12:58 GMT

Hi Lessie,

Thanks for the additional info. There have been some changes to the height conversion that do affect EPSG Projection 28992 - Amersfoort / RD New.

If possible, please use the latest version of CityEngine CityEngine 2016.1 release notes—Esri CityEngine | ArcGIS for Desktop .
Otherwise you could make a new scene using the corresponding UTM coordinate system (EPSG:32634).
3rd option is to export the KML from CityEngine, adding an Global Offset for Y to compensate for the shift (Altitude Mode = absolute).