MapWinGIS:ShapeNetwork ShapeNetworkExample

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ShapeNetwork Example

Here is a simple example of a shape network:

Figure 1: The shapefile for the shape network:

Image:ShapeNetworkExample.JPG

This shapefile can be used to create a shape network because it is a polyline shapefile.
Before the shape network can be created, we must choose the outlet shape and outlet point for the shape network.

Figure 2: The outlet shape and outlet point for the shape network:

Image:ShapeNetworkExample_outlets_labeled.JPG

In this shapefile, the outlet shape and outlet point have been selected as shown above in Figure 2. Now we are ready to create a shape network. When a shape network is created from this shapefile, we may get different networks, depending on our chosen tolerance value. Given a tolerance value of Tolerance A (Figure 3), the upper branch of the shapefile would be included in the shape network.

Figure 3: Tolerance A
(The tolerance value is represented by the radius of the red circle.)

Image:ShapeNetworkTest_Small_TolA.JPG

Figure 4: The shape network built using Tolerance A
(The shape network is shown in red.)

Image:ShapeNetworkTest_Shape 0.JPG

However, given a smaller tolerance value such as Tolerance B, shown in figure 5, the upper branch would be excluded from the shape network.

Figure 5: Tolerance B
(The tolerance value is represented by the radius of the red circle.)

Image:ShapeNetworkTest_TolB.JPG

Figure 6: The shape network built using Tolerance B
(The shape network is shown in red.)

Image:ShapeNetworkTest_Shape 0_tolerance.JPG

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This page has been accessed 1,846 times. This page was last modified on 9 November 2005, at 17:03.