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Define a local grid coordinate system for georeferenceing?

marianne.mcdonaldTZVTF
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Define a local grid coordinate system for georeferenceing?

marianne.mcdonaldTZVTF
Participant
Participant

We work on projects that use national grid coordinate system for the early stages, and then detailed design is done on a local grid (to reduce inaccuracies). We also sometimes have to import or export data in the form of shapefiles or other GIS data - so we're trying to georeference our drawings, but not sure if it's possible to define a local grid as a coordinate system or if we need to convert back to national grid for the import/export process?

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Pointdump
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Hi Marianne,
"...possible to define a local grid as a coordinate system or if we need to convert back to national grid for the import/export process?"
Yes, once you have created a custom coordinate system you can import/export GIS data, and even seamlessly work with the national grid.
Dave

Dave Stoll
Las Vegas, Nevada

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marianne.mcdonaldTZVTF
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Thanks! Would we need to share the custom coordinate system with others if we were issuing shapefiles for instance? (We're trying to work out what our preferred process would be - to convert the cad files to National Grid before exporting, or to export as local grid)

 

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Pointdump
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If you're sharing your Custom Coordinate System Drawing with someone using Civil 3D or Map 3D, that CS "tags along" and they will be asked if they want to add the custom CS definition to their MAPCSLIBRARY. If you're handing the drawing to someone with Vanilla AutoCAD it's best to give them a drawing in national grid.
Dave

Dave Stoll
Las Vegas, Nevada

EESignature

64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2024
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marianne.mcdonaldTZVTF
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Thanks! It would probably be for use with ArcGIS or QGIS so might be easier to stay with national Grid for exports