HOW TO: Advanced Geolocation Features in udStream
udStream and Geolocation
udStream by default supports a list of EPSG/SRID and support for more EPSG codes are added with each release. However, should you have an EPSG code that is not supported, you can try adding in its Well-Known-Text (WKT).
Well-Known-Text or WKT is text markup language that represents spatial reference systems of spatial objects and transformations between these systems. udStream uses WKTs to place your datasets in the right place of the map.
Before trying to use a WKT, check for the Spheroid Type (labelled SPHEROID) and Geodetic Datum (labelled GEOGCS) against the supported list in the table below:
Airy Modified 1849
Clarke 1880 (IGN)
PD / 83
Clarke 1880 (international foot)
Everest 1830 Modified
Hong Kong 1980
Overriding Geolocation with WKT
This assumes that you have converted your file to UDS
- Open udStream and load your dataset/s
- Under Settings > Appearance, Tick on Show Projection Information and Show Advanced GIS Settings
- Go back to Scenes, an option to Edit Spatial Reference will appear
- Copy the WKT in and click Apply:
- In the Scene Explorer, right-click on your dataset and select Reset Transform
- To verify if it loads in right location, Add a Map Tile:
Converting to UDS with Custom WKT
Once you verified that the file geolocates at the correct place, You can convert the file with the custom WKT embedded. To do this, you can follow the standard way of converting here then follow the steps below:
In the Convert window, tick on Override Geolocation
An option to Edit Spatial Reference will appear
Copy the WKT in AND change the very bottom text to AUTHORITY["EPSG","1"]]:
Click Apply then Click Convert
To verify, load in the converted file into Scene. It should be in the right position
IMPORTANT: udStream supports WKT in both HTML and Esri formats. For more information, you can check out https://epsg.io/
and select the right format
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