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rezam
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4 Posts

Posted - 07/30/2007 :  04:21:18  Show Profile  Reply with Quote
Is Gauss-Kruger Projection another name of Transverse Mercator projection?

If no, is it possible to do a converting between them? How? I'm using Datum WGS84

johan
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Sweden
15224 Posts

Posted - 07/30/2007 :  04:43:18  Show Profile  Visit johan's Homepage  Reply with Quote
Yes, Gauss-Kruger Projection is another name for Transverse Mercator projection.

Regards,
Johan

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rezam
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4 Posts

Posted - 07/30/2007 :  05:28:18  Show Profile  Reply with Quote
So,

If I change the Transverse Mercator algorithm to be the Gauss-Kruger algorithm (in WGS84 grids), it will show me the same result, isnt it?

Many Thanks,
Reza M
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johan
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Sweden
15224 Posts

Posted - 07/30/2007 :  05:30:19  Show Profile  Visit johan's Homepage  Reply with Quote
Transverse Mercator is one projection that uses Gauss-Kruger.

Yes, you should be able to do that. Test and verify the results.

Regards,
Johan

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rezam
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4 Posts

Posted - 07/30/2007 :  23:26:47  Show Profile  Reply with Quote
Another question,

How to convert a coordinate of (for example):
UTM Zone 51N (WGS-84) to WGS-84 Gauss-Kruger

Please also tell me if this question is not relevant.

Thanks,
Reza M
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johan
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Sweden
15224 Posts

Posted - 07/31/2007 :  03:15:47  Show Profile  Visit johan's Homepage  Reply with Quote
The question is probably not relevant.

Note that "Gauss-Kruger" is a method to do projections from lon/lat (datum) to Easting/Northing (grid), UTM uses Transverse Mercator (which is based on GK).

UTM is a grid, WGS84 is a datum.

I think what you need to do is to play around with CoordTrans, examine the results and compare it to other known values you expect to receive.

Regards,
Johan

Franson Support
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rezam
New Member

4 Posts

Posted - 07/31/2007 :  07:17:49  Show Profile  Reply with Quote
Thanks, Johan.
That's what I was thinking, but not sure as I dont have any reference nor someone to share the idea, since I'm not an expert of this.

The problem began when I had a coordinate in China presented like below:
Coordinate Using WGS-84:
122deg 6.406minute East (41 414 342 m)
30deg 36.37minute North (3 387 652 m)

I assumed the values between the brackets are the UTM coordinate, and I tried to check it. I put the latitude-longitude values above in CoordTrans using datum WGS-84, and the easting-northing result were:
414 376.43 m
3 386 298.83 m

By using other software I got the same result of easting/northing values.

Just for another check, when I tried to do the vice versa, (as I expected) both softwares showed the coordinate was not even in China. That's why I came with the conclusion that these easting-northing values (shown between the brackets above) were incorrect. Do you agree with me?

Many Thanks,
Reza M
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