How do I change a projection for a layer which is misregistered (without changing coordinates)?


Vector objects such as Lines, Polylines or Polygons have been digitised into the incorrect projection. In this case, reprojection does not work, as the object coordinates will change (move). For
example the vector object may have been created in the incorrect UTM Zone, or the wrong projection was selected during import and registration of the file.

How can this be modified without recreating the objects/registration?


For rasters or surface grid images, simply use Table>Raster>Modify Image Registration, and select a new Projection, or edit control points. Note that editing control points may cause errors, which ought to be fixed through rectification.

For points, you can firstly save the coordinates using DISCOVER>Projections>Updates Coordinates. Then simply delete the map, using Table>Maintenance>Table Structure and un-ticking Table is Mappable, and then re-create the points.

If a Polygon or Polyline table has been misregistered and digitized, then there is a free tool to correct this -

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Last Updated on: 9th of August, 2011