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| What?s the difference between setting the coordinate system for a layer, and changing it for a map? |
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The Coordinate System tab in the Property Manager will have
a Set button if you have a layer selected, or a Change button if you selected the
map.
When you select a map layer, the Coordinate System tab shows
the coordinate system for the data or grid file used to create that map layer.
This is the coordinate system of the source data or grid file, not what you want
the map to be displayed in. If the source data file had a reference file with
this information, then it is automatically filled in. If the source data file
did not have a reference file, then the coordinate system for the layer is set
to “Unreferenced local system”. Click the Set button to set the original coordinate
system for the source data for that layer. Once the coordinate system is set
for the layer, it should not be changed unless you change the source data or
grid file.
When you select Map in the Object Manager, the Coordinate System tab shows the
coordinate system that the map will actually be displayed as in the plot
window. Click the Change button to change the coordinate
system for the map to any coordinate system you want. When you change the
coordinate system for the map, all map layers will be converted from their source
coordinate system to this target coordinate system to be displayed.
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