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Creating and Editing Data in ArcGIS 9

Creating and Editing Data in ArcGIS 9. Data can be created and edited manually in a GIS. Using the imagery provided for your school as a base map, you can locate desired objects on the map and then create a new feature corresponding to the object.

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Creating and Editing Data in ArcGIS 9

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  1. Creating and Editing Data in ArcGIS 9 Data can be created and edited manually in a GIS. Using the imagery provided for your school as a base map, you can locate desired objects on the map and then create a new feature corresponding to the object. You may also find that you need to make changes to your attributes, the shape of your features, or that you need to add more features to your map. The next part of this lesson should be helpful in guiding you through some of the steps.

  2. You can easily create new features in your map without using GPS. The technique you will use is called Heads-Up Digitizing. • To create a new feature you will need to open ArcMap and select to use an existing map. Then browse for your schools name under C:\GeoWorkspaces. • When you see the map of your area, zoom to your school with the magnifying glass. Get close enough to see the objects you will map like walkways, buildings, flagpoles or athletic fields.

  3. Select the large plus sign to add an empty feature to the legend. • Double-click on “athletic field” or select it and press the Add button. • Since the field is defined as a polygon, a rectangle appears in the legend. Now we need to add data to the feature.

  4. If it is not already open, right-click in the empty space of the menu bar and select Editor. • Select the Editor button and select Start Editing from the drop down menu. • ArcMap asks which file you would like to edit. For now select “athletic field” under C:\Warehouses\School_Features. Note: If your streets do not line up with the imagery, you can fix them using this tool. Just start editing on the roads layer to match the imagery (which is more accurate).

  5. Select the Sketch tool. • In the editor toolbar make sure the task is to “Create New Feature,” and the target is “athletic”. • Begin by clicking in the corner of an athletic field and continue to outline the field until you are back at the starting point, then double-click. • Continue to digitize any other athletic fields. When finished, select Editor and stop editing. Remember to save often!

  6. Digitize the rest of the features for your school by the same process. Add the features in and then begin editing them. • When editing line features, you can make neater lines by right-clicking where you want your line to start and select Snap to Feature, then Edge. This allows you to connect lines seamlessly.

  7. When you have finished with all of your features, go to the Editor menu and select “Stop Editing.” Make sure you save your edits. • Now you will need to manually edit the attributes for the feature(s) you just added. Right-click on the shapefile you just created and select open attribute table.

  8. 21. Click “Options, Add Field.”

  9. In the Name blank, type Name. In my example this will represent the name of the open-space, digitized on the map. The type should be “Text.” • Now you will see the “Name” column in your table.

  10. Function • Repeat the process of adding fields. Add a new text field called “Function.”

  11. Function • Go to the Editor and click on Start Editing. With your table up front and your map, click on the square to the left of your first record in the table. Notice it turns blue. Note also that the feature is outlined in blue as well.

  12. Don’t forget to save Function • Type in the name and type of feature you have in the table. After you have typed in all of the fields, go to your Editor button and Stop Editing. Save your edits when prompted.

  13. At times you may need to correct a feature which may not appear properly.

  14. Click on the “Editor” button and “Start Editing.” • In the editor toolbar make sure the task is to “modify feature,” and the target is the one to which you would like to edit. Use the edit tool (looks like an arrow without a tail).

  15. Click on the vertex you wish to move. Hold and drag to the place you want it. • Right-click and select “Finish sketch when you have completed your edits.

  16. Don’t forget to save • If you would like to add a vertex, right-click and select “Insert Vertex.” • When you have completed all of your edits, go to Editor> Stop Editing.

  17. At this point we should have mapped: • 1. An athletic field • 2. A flagpole • 3. The buildings around campus • Now, you can use heads-up digitizing to complete your project. You will need to map: • All the athletic fields on your campus • Parking lots around campus • Any gyms or assembly locations • Any other buildings that haven’t been mapped • Other features that are important on your school grounds We want you to take some time to develop your skills and a final product that you can be proud of. When you are done with this, move onto chapter 5.

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