2.2.2 Roads Vs Linear Features
220.127.116.11 Example 4
|Location of Example:
||152°19'30" East, 24°56'35" South
- 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 18.104.22.168a 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.
- 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.
|Figure: 22.214.171.124 Representation of Canals.
Topic contact: email@example.com Last updated: January 20, 2012