7 parameters bursa wolfe transformation..
selebets
Global Mapper UserTrusted User
i added 1 datum in GM10. Then i put the seven parameters in the Create New Datum windows. The value is like below;
Translation X 1.69276 m
Translation Y -1.92994 m
Translation Z 2.07108 m
Rotation X (Rx) 0.03515 sec
Rotation Y (Ry) -0.02858 sec
Rotation Z (Rz) -0.00617 sec
Scale Factor 0.24859 ppm
But when i open the custom_datum.txt in the C:\Program Files\GlobalMapper10, last 4th values is different. Here the value.
"GDM2000MRSO","GCS_GDM_2000","GRS 1980",1.69276000000000000,-1.92994000000000000,2.07107999999999980,0.00000017041200891,-0.00000013855975006,-0.00000002991300412,0.00000024859000000
What its mean?
Translation X 1.69276 m
Translation Y -1.92994 m
Translation Z 2.07108 m
Rotation X (Rx) 0.03515 sec
Rotation Y (Ry) -0.02858 sec
Rotation Z (Rz) -0.00617 sec
Scale Factor 0.24859 ppm
But when i open the custom_datum.txt in the C:\Program Files\GlobalMapper10, last 4th values is different. Here the value.
"GDM2000MRSO","GCS_GDM_2000","GRS 1980",1.69276000000000000,-1.92994000000000000,2.07107999999999980,0.00000017041200891,-0.00000013855975006,-0.00000002991300412,0.00000024859000000
What its mean?
Comments
-
The rotation angle values are stored in the custom_datums.txt file as radians, while you specify them in arc seconds. Don't worry, the values are the same as what you entered.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
Ok.Noted. How to deleted the datum? I deleted the parameter in the custom_datums.txt. After open the GM10, the parameter will be generated again. How to remove it from GM? Thanks in advance..
-
To delete a custom datum you need to first close Global Mapper, then edit the custom_datums.txt file and remove the line for the datum you don't want. Then when you open Global Mapper back up that datum should not be there.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
Hi, I am working by GM11. I created some custom datum and i want delete them now, but i don't know way. help me. Sorry, my english bad.
-
Currently to delete a datum you need to first find the location of the custom_datums.txt file storing the datums off of the Help->About dialog in Global Mapper, then close Global Mapper, open that file, then delete the line with the custom datum that you want to remove. Then restart Global Mapper and the custom datum should be gone.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
I don`t have the custom_datums.txt file.
-
You would only have that file if you created any custom datums. Have you created any custom datums?
Thanks,
Mike
Global Mapper Support
support@globalmapper.com
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