25.6. Estimation Using Digital Elevation Models (DEMs)

Try these first

1. 1.

   What does DEM stand for?

   Hint

   Think about what 'digital' refers to in mapping.

2. 2.

   Name one software used for analyzing DEMs.

   Hint

   Consider software commonly used in GIS.

3. 3.

   What is the primary purpose of utilizing DEMs in hydrology?

   • To design urban areas
   • To estimate depression storage
   • To calculate population density

   Hint

   Think about what features affect how water collects.

4. 4.

   True or False: The Planchon-Darboux method is used for identifying land cover.

   • True
   • False

   Hint

   Consider the main function of this algorithm.

5. 5.

   Given a DEM of a fictional watershed, apply the Planchon-Darboux method to identify potential water retention areas and explain the importance of these findings.

   Hint

   Draw connections between elevation data and potential water storage.

6. 6.

   Analyze the impact of using high-resolution DEMs versus low-resolution DEMs in estimating depression storage for hydrological modeling.

   Hint

   Consider the detail in elevation data and its impact on modeling accuracy.