O'Reilly logo

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

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Digitizing the Line Boundaries of the Islands
____ 14. View the Link table. Note that the Link Table shows residuals—probably of a few hundred meters. Like in other transformations this is a measure of how much “less than perfectly linear” the transformation was. Dismiss the Link Table. Turn off the Georeferencing toolbar.
____ 15. Click Editor. Click Start Editing. Click Create Features. You will create new features with the Line Construction tool. Bring up the Snapping tool bar. Set Snapping to Snap To Sketch (on the drop-down menu). Make sure Ends will be snapped to. Under Options, set the snapping tolerance to 5 pixels.
____ 16. Digitize the square island and the square lake inside it. Open the attribute table of North_Islands_Lines. The Shape_Length of the outer line should be about 120,000 meters. What is it? ____________. What is the length of the inner line? ____________. Dismiss the attribute table.
____ 17. Digitize the other islands. This will be easier and more accurate if you zoom in on each island to do the digitizing. The island in the southeast has a lake within it, an island in the lake, a volcano on that island, and a cauldron defined within the volcano. Each time you zoom or pan you will have to choose the Construction Tool again.
____ 18. Click Save Edits. Make the feature file line symbol a bright color of width 2, zoom to the layer’s extent, and check that everything has been digitized. If not, complete the editing. Click Save Edits again. Stop editing. ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required