I am transforming a shp file from CGVD1928 to CGVD2013. Before the transformation, the ESRI WKT specifies the vertical datum as CGVD1928 but after the transformation, the vertical datum information seems to be lost.
Question
Is there any way to retain vertical datum information after transforming?
This post is closed to further activity.
It may be an old question, an answered question, an implemented idea, or a notification-only post.
Please check post dates before relying on any information in a question or answer.
For follow-up or related questions, please post a new question or idea.
If there is a genuine update to be made, please contact us and request that the post is reopened.
It may be an old question, an answered question, an implemented idea, or a notification-only post.
Please check post dates before relying on any information in a question or answer.
For follow-up or related questions, please post a new question or idea.
If there is a genuine update to be made, please contact us and request that the post is reopened.
+17- Safer
Hi @smicheau01,
How are you transforming the coordinate system for the shapefile?
Have you tried using the CsmapReprojector? The CsmapReprojector is able to handle both horizontal and vertical datum transformations.
Hi @smicheau01,
How are you transforming the coordinate system for the shapefile?
Have you tried using the CsmapReprojector? The CsmapReprojector is able to handle both horizontal and vertical datum transformations.
+17- Safer
Hi @smicheau01,
Unfortunately, this is a limitation and a known issue that our development team is aware of (PR 41877). I will update you when this is supported natively in FME.
The good news is there are a couple of workarounds available:
First you need the ESRI WKT description of the coordinate system. You can get the WKT string using ArcCatalog by just creating a dummy Shape file with the right X,Y and Z coordinate systems and then editing the .prj text file. (There are probably other ways to obtain this..)Then there are two methods you can do go about it: 1. In a text editor open the file <FME Install Dir>\\Reproject\\Exceptions\\esriwkt.db.
Search for the FME coordinate system short name you choose for creating the WKT
- if you don't find an existing entry for it add one near the top of the file like this:
ESRI|<FMEShortName>|<paste the string from the .prj file here>
Note: <FMEShortName> must already exist
If you do find an existing entry, modify it to replace the projection string with the one from the shape file. Now in FME Workbench when ever you write a feature class with that FME coordinate system set for the destination the feature class should be defined with the specified vertical datum.
Note: You must make sure to define the feature class to have Z coordinates in the properties of the FME destination feature type.
2. In a workspace use a CoordinteSystemDescriptionConverter to convert Esri WKT to an FME coordinate system name, and then use a CoordinateSystemSetter to attach it to features. The writer will output the WKT exactly.
+3- Contributor
@smicheau01 I'm not seeing CGVD2013 listed as a datum option in FME? Did you have to add this manually?
Login to the community
No account yet? Create an account
An FME Account is required to contribute
LoginEnter your E-mail address. We'll send you an e-mail with instructions to reset your password.