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ChicagoLooper
en respuesta a: pendean

@pendean wrote

<<....Your US SURVEY FEET file's distance from 0,0,0 is absolutely crazy far....>>

 

In the US, the coordinates for the State Plane Coordinate System, SPCS, are always large. (This post won't cover the reasons why, but easily could.) Most States have more than one zone, e.g. Illinois, Indiana and Ohio have 2 zones each, Wisconsin, Colorado, Florida and Michigan have 3 zone each, Texas has 5, California 6, and Alaska 10.

 

Many small States have only 1 zone, e.g. Vermont, Connecticut, Rhode Island and Maryland but some large ones do too, they include Montana, South Carolina, North Carolina and Tennessee. The number of zones a State has is determined by each State and their zones typically follow County borders for demarcation. There are over 100 Zones in the US and the US Territories.  

 

The SPCS is easy to use, provided you know how to lookup and use the correct Zone. When SPCS is used in a digital drawing environment such as AutoCAD they have a high level of accuracy (less than 1:10,000) due to each individual zone having its own PROJECTION. The coordinates may be large, but they're not that crazy.

 

If a version of AutoCAD hinders a user due to limits placed in the drawing, then the user should switch to another version, one that specifically can handle SPCS, especially the verticals with a Coordinate System Library which a user can select from and assign to modelspace. 

 

 

Chicagolooper

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