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Creating a 3-D Feature
____ 15. If you happen to have dismissed ArcMap, start it again with North_Islands_map4. Turn on the image layer MSH. Zoom in on the sixth island. You should see the image of the volcano. (If not, you will have to Georeference the image again.)
____ 16. In ArcMap add the Feature Class named Trail_horizontal from
___IGIS-Arc_YourInitials\Digitize&Transform\Islands.mdb\UTM_Zone_2.
Make it a red line of width 3.
Trail_horizontal is a trail from the water’s edge to the rim of the volcano, but with all segments in the horizontal, sea level plane. What we will do is make a three-dimensional trail, named Trail, with the Editor, using the pattern of Trail_horizontal.
____ 17. In ArcMap add the empty Feature Class named Trail (that you made earlier in this exercise), from
___IGIS-Arc_YourInitials\Digtize_Transform\Islands.mdb\UTM_Zone_2
____ 18. Zoom to Trail_horizontal. Start Editing Trail–making sure that the target is Trail. Starting at the ocean make a polyline with five segments that overlay the segments of Trail_horizontal. End each segment, including the last, with a single click.
____ 19. Find Sketch Properties on the Editor toolbar. Click it. You will see the three dimensional coordinates of the six vertices you have made. All the z-coordinates are presently zero. Starting with the vertex on the ocean, click each z-coordinate to change the values to:
``0, 400, 900, 1500, 3000, 4000``
____ 20. Click Finish Sketch (or press F2). Dismiss the Edit Sketch ...

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