2.2.2 Roads Vs Linear Features
22.214.171.124 Example 3
|Location of Example:
||152°52'19" East, 25°22'57" South
- Drains/Canals can be differentiated from Roads as they do not provide connectivity to the existing road network.
- In Figure: 126.96.36.199b note that the upper part of the drain near the water source gives off a light blue signature, indicating presence of water. The drain terminates at the water tank which also shows the same water signature.
- 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.
- The use of multispectral imagery band combinations can aid in the interpretation and differentiation of water.
|Figure: 188.8.131.52 Representation of Canals/Drains Vs Roads
Topic contact: firstname.lastname@example.org Last updated: January 20, 2012