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If you find these tutorials useful and would like to link to them from your own pages,please contact the Drew Spatial Data Center Director, Dr. Catherine Riihimaki via email. You are invited to leave comments or ask questions in any of the Comment areas of each tutorial page. |
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Adding New X/Y Data to a Map Project from a Table
If you will be using geographic coordinates from an already existing table, make sure that the X value and Y value for your coordinates are listed in separate columns. If you have latitude and longitude coordinates, you can label them LAT and LONG in your table. It is a good idea to first import a table to a Personal Geodatabase for your Map Project, but this is not necessary. The table will import properly if it is saved as an .xls, or .dbf file.
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- In the Edit Toolbar, use the pull down menu and choose Start Editing.
- Make sure that your Target is the new Shapefile, and not another Map Layer.
- Make sure that the Task is set to Create New Feature
- Choose the Edit Tool - it looks like a black arrow
- Using the Edit Tool, click on the Point that you want to delete. It will be highlighted in cyan.
- Right click on the highlighted Point. Choose Delete from the pop up menu.
- Go to the Edit drop down menu and choose Save Edits to continue editing, or choose Stop Editing to end the editing session.
Display Digitized Coordinates for XY Points in
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an Existing Shapefile Map Layer
- Open the Attribute Table for the Digitized Points
- Click on the Options button and choose Add Field.
- Name the Field Y - this will be where you input your LATITUDE coordinates.
- In the Type pull down menu, choose Double.
- Click OK.
- Repeat steps 2. - 5. to create an X Field.
- Right click on the title of the X Field, and choose Calculate Geometry. Click Yes.
- In the Calculate Geometry dialog box, choose the X Coordinate of Point in the Property area.
- Make sure that the proper Coordinate System for your Map Project is displayed in the Coordinate System Field.
- Make sure that the proper unit of measurement for your Coordinate System is displayed in Units pull down menu. Some Coordinate Systems use Feet and some use Meters - check the parameters of your Coordinate System before proceeding if you are not sure.
- Click OK.
- Repeat steps 7. - 11. for the Y Field, making sure that the Property area displays Y Coordinate of Point.