Edit built-in datum
Vincent
Global Mapper UserTrusted User
I would like to edit some of the built-in datum with my own parameters. Is it possible to do it ?
Thank you.
Thank you.
Comments
-
It is not possible to edit the built-in datums. You need to create a custom datum with the parameters that you want to use. You can do this on the Projection tab of the Configuration dialog.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
Thanks.
For the moment I create my own datum. Do you plan to edit the transformation parameters for the Tananarive 1925 datum ?
You use the NIMA transformation parameters (Tananarive 1925 > WGS84) :
Tx = -189 m
Ty = -242 m
Tz = -91 m
Those parameters are inacurrate.
French geographic office (IGN) proposes a better set of parameters :
Tx = -179 m
Ty = -229 m
Tz = -109 m
I recently conducted surveys in Madagascar, and I can confirm that this set of parameters is much more accurate.
Would you mind updating this parameters in the Global Mapper built-in datum ?
Thanks -
I'll take your word for it that those parameters are more accurate (apparently EPSG has not picked up on those parameters yet). I have placed a new build at http://www.globalmapper.com/global_mapper9.zip with the updated parameters for you to try. Simply download that file and extract the contents into your existing v9.xx installation folder to give it a try.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
I'm still using version 8 of Global Mapper (my office has not yet updated the software...). Can I use this new build ?
Thanks -
You would need to have a v9 license to use the new build as the update is in v9 only.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com
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