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Figure 3.6: Map Wheel

3.2.3 Parameter Extraction

Using traditional methods, hydrologic parameters are extracted from paper

maps.

Slope

is

manually

calculated

based

elevations from the upper point of the longest

on the difference in contour flow path and from the outlet.

line The

difference in elevation is divided and longest flow path length are calculated using the planimeter.

by the length of the longest flow path. Perimeter determined by using the map wheel, and area is

3.3

CASE II: ON-SCREEN DIGITIZING OF RASTER GRAPHIC MAPS

The process of on-screen digitizing of raster graphic maps is the next

closest method to the traditional, paper map based methods of using a map wheel

and a planimeter. The methodology is analogous; with the exception that the

34

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