WGS84 - EPSG 4326

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08-13-2013 03:36 AM
BenLeslie1
Regular Contributor
Does CityEngine support EPSG 4326?

Does anyone know how to translate EPSG 4326 into EPSG 32630 (without arcGIS)?  I'm having trouble getting my terrain to align with my shapefiles.
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4 Replies
BenLeslie1
Regular Contributor
I don't understand the problem I'm having.

I have UK data in "WGS84 - EPSG 4326" however when I import it into CityEngine it puts it in "WGS 1984 UTM Zone 30N EPSG:32630".

This is OK for vector data but raster data imports somewhere many miles away.  I have converted the raster into EPSG:32630 using qGIS but it doesn't help at all - it seems to import into the same position as before but is now a bit squashed.  How do I get things to line up like they do when I view them in qGIS.
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MatthiasBuehler1
Frequent Contributor II
Hi !

I'm not sure about this precise projection. There's some (rare) ones which are not supported indeed, but I'm not sure if it's possible to create such a list.

Thus I usually recommend to use the default UTM projection.

Let me know if reprojecting works for you ..

Matt
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BenLeslie1
Regular Contributor
Thanks Matt

I got it to work but it's not ideal - I have to reproject it, then note down the xy coords and dimensions so I can position it in CE.  There is a slight rotation applied in the reprojection so I get some zero values around the edges of the bounding rectangle - this makes me think I will not get a clean reprojection back into EPSG4326 after export if I have altered the terrain (but I haven't tested this yet).

I'm suprised if EPSG4326 is rare - according to wiki it is the latest version of WGS84:
http://en.wikipedia.org/wiki/World_Geodetic_System

edit:
Maybe this is the problem, I guess 4326 is spherical - does CE only do flat earth approximations?
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MatthiasBuehler1
Frequent Contributor II
CE supports all projected coordinate systems, but as geographic ones only WGS84.

Well, I'm no specialist in that field. ;)

Maybe it's best that you send me a test set of the data ?

m.
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