Coordinate question

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03-29-2019 06:51 AM
JimCousins
MVP Regular Contributor

I have some data in Michigan State Plane NAD83 in International feet. Does anyone know if this is accounted for when adding this data set to a map in Michigan State Plane 83 in USfeet?

Regards,

Jim

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MelitaKennedy
Esri Notable Contributor

Yes, when we unproject/project data, we look at the actual unit that are listed in the coordinate system definition. The false easting/false northing values must be in the same unit so if you compare the int'l ft and US survey ft definitions, you should see slightly different numbers.

Melita

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DanPatterson_Retired
MVP Esteemed Contributor

If they do have a different code EPSG code, I presume they would project on the fly

Spatial Reference List -- Spatial Reference 

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JimCousins
MVP Regular Contributor

That is my quandary. The FIPS code is the same, but the units are different. Does arcgis recognize feet_int versus USfeet and account for it?

The data that I have produced and the data that someone else has produced do not align, so I am fishing for the reason.

Regards, Jim

Jim Cousins

GIS Project Scientist

S.S. Papadopulos & Associates, Inc.<http://www.sspa.com/>

7944 Wisconsin Avenue | Bethesda, Maryland 20814

Direct: (301) 500-2271 | Office: (301) 718-8900

jcousins@sspa.com<mailto:jcousins@sspa.com>

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DanPatterson_Retired
MVP Esteemed Contributor

Isn't the FIPS code a county code (Canadian here, so bear with me).

I was more interested in what the actual coordinate system was for each file.  If they were defined the same but differ in placement, then the units and/or datum (nad whatever) would account for the shift). 

Check via properties

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MelitaKennedy
Esri Notable Contributor

Yes, when we unproject/project data, we look at the actual unit that are listed in the coordinate system definition. The false easting/false northing values must be in the same unit so if you compare the int'l ft and US survey ft definitions, you should see slightly different numbers.

Melita

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JimCousins
MVP Regular Contributor

Thank you Melita, this answers my question.

Best Regards,

Jim

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