Editing Spatial Data Sometimes, the data that you receive is not as accurate as it could be. You can easily correct this problem by making some simple adjustments in the data. This next lesson is designed to take you through these steps so that you will be able to adjust your data as needed.

Notice that in this data set, some of the streets in the adjacent view do not line up with the aerial photo. Let’s edit the “Roads” layer so that they overlay the image correctly.

1. To edit the feature class “Roads,” find the part of the street which needs to be corrected, and click on it. It will turn green.

2. Click the “Edit Geometry,” button (circled in red below) 2. Click the “Edit Geometry,” button (circled in red below). Sort of a zig-zag line. 3. Then with the mouse, click and drag the “handle,” (vertex) of the line. (circled in red) and move it to the position desired.

4. Note the change in position 4. Note the change in position. Continue moving each vertex so that the street features at your school properly matches the aerial image street location.

5. If you would like to change the colors of your feature classes, double-click on the symbol in the legend. Then click the color button in the style definition box.

6. Click on the color of your choice 6. Click on the color of your choice. Click OK in the color palette and then ok in the Style Definition box. Don’t forget to save

Sometimes, we need to edit existing data Sometimes, we need to edit existing data. Other times, we need to collect our own. We can do this by either digitizing features that we can see on an image (which we will do in chapter 8), or collecting data using GPS. Let’s collect some of our own data in the field and bring it into our project. For this, we will need our GPS units, our data transfer cables, and Trimble Pathfinder Office.