15.7.1.2.2. Thiessen Polygon Method

Try these first

1. 1.

   What is the Thiessen Polygon Method used for?

   Hint

   Think about how we can represent areas influenced by each rain gauge.

2. 2.

   Name the first step in the Thiessen Polygon Method.

   Hint

   How do we connect the stations geometrically?

3. 3.

   What is the primary purpose of the Thiessen Polygon Method?

   • To measure soil moisture
   • To estimate average rainfall
   • To record temperature

   Hint

   Consider what type of data we're summarizing.

4. 4.

   True or False: The Thiessen Polygon Method involves drawing bisectors between all point rainfall stations.

   • True
   • False

   Hint

   Remember how we designate areas of influence.

5. 5.

   Suppose you have three rain gauge stations with the following data: Station A: 100 mm, Station B: 150 mm, Station C: 200 mm. If their corresponding polygon areas are 10 km², 20 km², and 30 km², respectively, calculate the average areal rainfall.

   Hint

   Use weighted averages based on the area.

6. 6.

   Consider a scenario where two rain gauges are located at different elevations (100 m and 200 m) but within close distance. Discuss how you would apply the Thiessen Polygon Method and what additional factors you might need to consider.

   Hint

   How does elevation impact rainfall data?