coordinatesystem-strings - parameter in prj-files

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10-29-2014 04:50 AM
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Esri Contributor

Dear all,

 

I'm using pyhton to read out prj-files. In some strings I found after the paramter [UNIT] some values and I do not really know for what they are needed? Here is a string expamle:

prj_string_example.png

Have anyone an idea? Are these some kind of transformation parameters?

 

Thank you and with best regards,

 

Marko

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Occasional Contributor III

If I recollect it correctly then those are XY domain, Tolerance, Precision related values. They are not used for transformation

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Esri Notable Contributor

Sachin Kanaujia‌ is correct. They are used in geoprocessing to fully store or create a spatial reference, but a regular 'prj' or coordinate system string doesn't include these values. They are, in order:

minimum x value

minimum y value

xy precision (1/precision = xy resolution)

minimum z value

z precision

minimum measure value

m precision

xy tolerance

z tolerance

measure tolerance

IsHighPrecision: marker that the spatial reference is high precision, rather than the older standard precision.

Melita

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Occasional Contributor III

Thanks Melita Kennedy. My UpVote for the elaborate answer and also refreshing my memory

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Esri Contributor

I hook up with Sachin Kanaujia‌. Thanks to you and Sachin Kanaujia‌ for the fast answer!

Marko

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