WETMAAP Technique
2Technique 2: Manual GIS
Element 1: Making Feature Overlays
Materials:
1:24,000 USGS Cape Hatteras-Buxton Quadrangle
(2) 11"x 17" clear film overlay
drafting tape
Colored marker pens: Red, Blue (Sharpies), and Black (ultra-fine)
Exercise:
1. Use 1:24,000 scale USGS Cape Hatteras-Buxton Quadrangle
2. Use clear film 11"x 17"overlay (large)
3. Tape clear film overlay on top of 1:24,000 scale map. Tape at the top edge.
4. Use the black pen to make four "corner marks" (tick mark _) on the overlay, one at each corner of the study site.
5. Trace the shoreline of Cape Hatteras, both the Atlantic Ocean and Pamlico Sound, in BLACK on the overlay.
6. At the bottom of the overlay (in black) draw a short horizontal line and label beside it "1980 Shoreline.
Hint: Use of a symbol with a short description beside it is a "key," or means of identifying selected features.
7. Make a large dot in BLACK on the lighthouse and label the dot "Cape Hatteras Lighthouse".
8. Trace the large pond at the southern tip of the Cape in BLUE.
9. At the bottom of the overlay (in blue) draw a small circle and label beside it "Pond."
10. Remove the "1980 Shoreline" overlay.
11. Use a second 11"x 17"clear film overlay.
12. Tape clear film overlay on top of 1:24,000 scale map. Tape at top edge.
13. Use the RED pen.
14. Use the RED pen to make four "corner marks" (tick mark) on the overlay, one at each corner of the study site.
15. Trace all primary and paved roads in RED on the overlay.
16. At the bottom (in red) draw a short horizontal line the same length as the blue line and label it "Roads."
Hint: Combining several single "key" items creates a "legend." Every map should have a legend
17. Tape the "1980 Shoreline " and "Roads" overlays on top of the 1:24,000 scale map. Use the four corner marks to line-up (‘register’) the overlays on top of each other.
Hint: Tape one overlay at the bottom edge and the other overlay at the left or right edge. By attaching the overlays at opposite edges, you can flip the overlays up and down in various alignment.
You have created a manual GIS.