Use to select the coordinate system when the source is set to Custom. The coordinate system drop-down list is available only when a document that has a spatial location set to custom is selected. It is then possible to change its coordinate system value.
When multiple documents are selected, if they use different coordinate systems, the coordinate system list will be set to <various>.
At any time, when changing the coordinate system, the transformation between the source and the newly selected coordinate system must be possible. The new coordinate system must be chosen carefully.
Note: The Modify Spatial Attributes is applied to the selection in List view (resulting from a search or not). You can interrupt the data processing at any moment.
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