topic Re: coordinatesystem-strings - parameter in prj-files in Coordinate Reference Systems Questions

coordinatesystem-strings - parameter in prj-files

MarkoEinspieler1 — Wed, 29 Oct 2014 11:50:49 GMT

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:

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

Thank you and with best regards,

Marko

Re: coordinatesystem-strings - parameter in prj-files

SachinKanaujia — Wed, 29 Oct 2014 14:14:04 GMT

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

Re: coordinatesystem-strings - parameter in prj-files

MelitaKennedy — Wed, 29 Oct 2014 20:39:50 GMT

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

Re: coordinatesystem-strings - parameter in prj-files

SachinKanaujia — Thu, 30 Oct 2014 06:28:20 GMT

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

Re: coordinatesystem-strings - parameter in prj-files

MarkoEinspieler1 — Thu, 30 Oct 2014 07:46:22 GMT

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

Marko