3.7.1. Change Detection Techniques

Try these first

1. 1.

   What does post-classification comparison involve?

   Hint

   Think about how you might analyze two maps.

2. 2.

   What is a key advantage of image differencing?

   Hint

   Consider what we do to find the difference.

3. 3.

   What technique compares classified images from two different dates?

   • Image Differencing
   • Post-classification Comparison
   • Change Vector Analysis

   Hint

   Consider which method involves looking at changes over time.

4. 4.

   True or False: Change Vector Analysis can determine the direction of changes.

   • True
   • False

   Hint

   Think about what additional information CVA provides compared to others.

5. 5.

   You are tasked with studying land-use changes in a coastal city affected by severe weather events over five years. Propose a comprehensive approach using all three change detection techniques, ensuring to discuss the merits and challenges of each.

   Hint

   Consider the strengths and limitations of each method in relation to your study area.

6. 6.

   Given a dataset of classified images, design a workflow for implementing Change Vector Analysis. Discuss what preconditions are necessary before applying this method.

   Hint

   Think about essential preprocessing steps that ensure accurate analysis.