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UTM Transformation

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(@topaya)
Posts: 8
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What kind of transformation we can assume about utm to local coordinate transformation.(conformal,projective,affine,.....).

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Posted : December 10, 2015 9:42 am
(@mightymoe)
Posts: 9920
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You can't assume anything, you can only go where the data takes you

 
Posted : December 10, 2015 11:30 am
(@norman-oklahoma)
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A "local coordinate transformation" can be anything. Need more information. Perhaps you mean converting UTM to State Plane?

A UTM is, as the name suggests, a transverse mercator projection, and a TM projection is conformal.

 
Posted : December 10, 2015 12:08 pm
(@bill93)
Posts: 9834
 

You can assume an affine transformation over some small region with modest error due to the distortion of distances. The errors will get large over only a few miles/kilometers of north-south spread, and the higher the latitude the more error.

Find the UTM scale factors at the corners of a UTM "rectangle" containing your project and compute the distance error on the rectangle using an average scale factor.

 
Posted : December 10, 2015 4:11 pm