Assigning a map projection that is not appropriate for the area in which the data is located can add a margin of error.Spatial transformations can also be affected even when the most accurate transformation method is used. Changing the projection in a data frame to a projection and datum that is different from the source data can add a margin of error to your data and snapping tolerance.As a result, arcs cannot be projected on the fly and may not display or behave as expected. Circular and elliptical arcs do not contain vertices along their lengths.Editing features that are projected on the fly can slow down the responsiveness of your map.However, some editing tasks may give you unexpected alignment or accuracy problems. You can edit data that is in a different coordinate system than the data frame in which it is displayed. For example, if the data you chose to edit is in a different coordinate system than the data frame, an information message appears informing you of this. You are not required to correct the issue to edit that layer or table, but it is recommended that you do so. Information messages provide additional suggestions to improve performance when editing.You need to resolve the issue with that particular layer or table before you can edit it. Warnings allow you to start an edit session but prohibit you from editing certain items in the map.You can receive an error message if you have no data sources that are editable, there is a licensing issue (such as attempting to edit certain types of geodatabase features while using ArcGIS Desktop Basic), or you have certain layers inside a basemap layer. You are unable to edit any data until you resolve the issue. Errors prohibit you from starting an edit session.You can receive errors, warnings, or information messages. When ArcMap encounters problems starting an edit session on the data you chose, a dialog box appears providing additional information. Errors that may occur when you start editing Coordinates or measures are out of boundsįollowing are some common errors that may occur during editing.Errors that may occur when you start editing.
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