18.104.22.168 Example 2
|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: 22.214.171.124b 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 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, Dam 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: 126.96.36.199 Representation of Canals
Topic contact: email@example.com Last updated: January 20, 2012