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Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition by Michael D. Kennedy

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Five islands divided by county and agency
As a first step, you will split the square island, except for its lake, into two polygons.
____ 21. Start Editing. Use the Select features tool on the Tools toolbar to select the land part of the square island. You should see the outer border of the island and its inner border (separating it from the lake) highlighted. Select the Cut Polygons tool from the Editor toolbar. Your mouse cursor will become crosshairs. Right-click the data frame and select Absolute X, Y. Type 515000 for X and 4300000 for Y. Press Enter. Press F6 to get the Absolute X, Y window back, and enter the southern coordinates: 515000 and 4160000. Press Enter. Right-click and select Finish Sketch. You should see two polygons where one was before. The lake will not be split, since it was not selected. Click Save Edits, then Stop Editing.

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