coordinatesystem-strings - parameter in prj-files

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10-29-2014 04:50 AM
MarkoEinspieler1
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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4 Replies
SachinKanaujia
Occasional Contributor III

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

MelitaKennedy
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

SachinKanaujia
Occasional Contributor III

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

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MarkoEinspieler1
Esri Contributor

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

Marko

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