Geo Coordinate missing

Question

Hi (Bentley), 
 Can you add a GEO coordinate ERTF89 UTM sone 32 
 And is there a way to do this manually inside MicroStation? 
 Thanks in advance 
 //Christiaan

Ron Jones · Accepted Answer

Christiaan Post said: what do I need to fill in here for me it's quite confusing 
 When you edit the GCS just copy the entries shown in my screen shot.

Ron Jones · Answer

Hi Christiaan, 
 Based on the image you posted it looks like you are refering to EPSG:5972 (ETRS89 / UTM zone 32 + NN2000 height) which is not a GCS delivered with MicroStation. You should be able to manually add it to you own custom library by following the Rod Wing's advice in his post. You can use the Well Known Text (WKT) data available at https://epsg.io/5972 to create a new entry for this GCS. 
 Regards, Ron

Andrew Bell · Answer

I have performed a quick search in MicroStation CONNECT Edition (Update 14) and could not locate this GCS in the library. This version currently does not have the ability to add new GCS but you could perform this within Bentley Map | OpenCities Map . 
 communities.bentley.com/.../--defining-a-custom-coordinate-system-v8i

Lorys · Answer

Thats fine but there is northing I can find in the help where or how you get the actual numbers to edit the datum... 
 I remember in V8i I save an article that you can manually re-register known points and maybe create something of a correction but its still not a new datum... 
 Maybe buy global mapper (GIS pakage) license is <$900 AUD import with your current recognised datum and transform to missing datum then export to DGN (rename your model ERTF89 UTM zone 32 .. then only work in world coincident... 
 But I agree that its not good enough bentley should give use a FREE tool or utility to make datums in Microstation or take requests and put new ones in a repository for users to download... 
 Mean while try the GIS forum and some kind soul may make it for you in their Bentley Map can only ask right? 
 But I still don't see why Bentley cant take requests and make it for you to add from a repository then they only need make it once per missing datum... not asking for local datums made by a surveyor for a one off survey but World recognised datums like EPSG 
 Quick google search tells me its a europe datum and the equivalent is EPSG 25832 ( with E, N) or 5652 ( with variant N,E) for Northern Europe... 
 Look here https://spatialreference.org/ 
 found your datum and here is the content of the prj file 
 PROJCS["ETRS89 / UTM zone 32N",GEOGCS["ETRS89",DATUM["D_ETRS_1989",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",9],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]] 
 but how and what you copy to make a new bentley datum is above my pay grade...

Frank Klein · Answer

Lorys said: Quick google search tells me its a europe datum and the equivalent is EPSG 25832 
 But that is the answer and this GCS is available in Microstation IMHO. 
 As a German I think the original Post does mean ETRF89 UTM Zone 32, practically the same as ETRS89 UTM Zone 32. Available in V8i and I think in MS CE, too. 
 https://epsg.io/25832 
 It is the standard reference system for the European Union and it is used with the UTM projection by almost every federal German Land Surveying Agencies. 
 REPLY on Ron Jones 16 Nov 2020 
 The connected vertical datum NN2000 to ETRS89(horizontal) , the Norwegian " Norway Normal Null 2000" height system wasn't on "my screen", so Ron's answer seems to be right.

Ron Jones · Answer

Hi Christiaan, 
 I am not a Bentley Map user but I looked in the Bentley Map Help and found the following information. 
 Bentley Map provides a keyin to import a text file with WKT, create and assign a geographic coordinate system (GCS). This text file is typically an ESRI .PRJ file associated with a SHP file. 
 Key-in: MapCSUtilities ReadWKT filespec 
 By using this key-in and the WKT file I downloaded from https://epsg.io/5972 I was able to create and assign the GCS shown in this image. 
 
 Hopefully this helps. 
 Regards, Ron

Lorys · Answer

I compared the WKT file contents to your screen and I can't see where ALL the ellipsoid information comes from in wkt file ... 
 I understand that with Bentley Map and keyin, but I think the prj file ( for those without map) has all the information you just have to know which bits go where... your screen shot matches the prj file entries better but I still cant see where, even with the wkt file from the link , you get the ellipsoid data ie polar radius and eccentricity...? items 1 & 2 they are not in the prj or the wkt 
 And the source entry below that where does it come from as it dont look right..

Lorys · Answer

Ron Jones said: As I said, I am not a Bentley Map user and don't claim to be an expert, but with that said, I believe those are derived values based on data in the GRS1980 ( Geodetic Reference System 1980 ). 
 They were automatically provided by the Key-in: MapCSUtilities ReadWKT filespec 
 Regards, 
 For those of us without map then 
 the prj or wkt tells us to also use Geodetic GRS 1980 and those values are always the same for GRS 1980 and the bentley link ( thanks Samir) doesnt give enough details on what needs to be obtained externally and edited to match up in the Microstation tool , just copy edit to suit isnt enough help really 
 (FYI the Eccentricity from the link e = root of e squared where e2 was given in the link and polar radius is given as b the semi minor axis).. I suppose its just a whole science in itself and beyond the average cad user even with some small amount gis and survey background... I'm glad I only need 2 GCS systems here in Oz both if which live in CE but only one in V8i...

Geo Coordinate missing

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