GED Social Studies TestGeography and the WorldMedium
A geographer is analyzing satellite imagery to identify areas of significant deforestation in the Amazon rainforest over the past decade. Which geographic information system (GIS) technique would be most effective for detecting and quantifying these changes in land cover?
- ANetwork Analysis
- BSpatial Interpolation
- CChange Detection
- DGeocoding
Show answer & explanationAnswer & explanation
Correct answer: C. Change Detection
Change detection is a GIS technique that compares two or more images of the same area taken at different times to identify and quantify differences in land cover, such as deforestation.
Why the other options are wrong
- A. Network analysis is used for optimizing routes or flows, not for land cover change.
- B. Spatial interpolation estimates values at unmeasured locations, not for comparing changes over time.
- D. Geocoding converts addresses into geographic coordinates, unrelated to land cover change analysis.
Change Detection (GIS)
A process within GIS that identifies differences in the state of an object or phenomenon by observing it at different times. It is commonly used with remote sensing data to monitor land cover changes like deforestation or urbanization.
- Compares multi-temporal datasets (images from different dates)
- Quantifies changes in land cover or features
- Requires accurate co-registration of images
- Used for environmental monitoring, urban growth, disaster assessment
Memory trick: To see what's changed, compare the dates, change detection facilitates.