2.2.2 Roads Vs Linear Features
2.2.2.4 Example 4
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| Location of Example: |
152°19'30" East, 24°56'35" South |
| Distinctive Characteristics: |
- Drains/Canals can be differentiated from Roads as they do not provide connectivity to the existing road network.
- If the Drain/Canal is completely dry it will appear lighter, similar to the surrounding soil and vegetation. The the edges will often appear much lighter, due to the excavated soil from construction.
- Drains generally start at a water source and can end at a Reservoir, Water Tank or Sea.
- Drains follow the topography of the land whereas roads may traverse hills and valleys.
- In Figure 2.2.2.4a the canals appear as dark blue linear bodies when filled with water.
- The use of multispectral imagery band combinations can aid in the interpretation and differentiation of water.
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| Regional Considerations: |
- In areas where there is irrigated crop farming Canals/Drains appear as regular structured networks which show a water flow hierarchy diminishing from source. They are often aligned with paddocks and have access tracks or roads running parallel to them.
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| Figure: 2.2.2.4 Representation of Canals. |
Topic contact: mapfeedback@ga.gov.au Last updated: January 20, 2012
