Image classification groups pixels with similar spectral characteristics into categories like forest, water, or urban.This simplifies interpretation and analysis.
75.
Which of the following is a disadvantage of raster data in GIS?
Raster datasets often require significant storage due to high pixel counts.However, they excel at representing continuous data and support overlay operations.
76.
What type of remote sensing uses the visible, near-infrared, and shortwave infrared spectrum?
Optical remote sensing utilizes visible, near-infrared, and shortwave infrared bands to capture reflected sunlight from Earth's surface.This data is used for mapping land cover, vegetation, and geology.
77.
What is the function of a Digital Elevation Model (DEM) in GIS?
A DEM represents the Earth's surface elevations digitally.It is essential for terrain analysis, slope stability, watershed delineation, and construction planning.
78.
Which satellite system is primarily used for global land surface observations?
MODIS onboard Terra and Aqua satellites provides frequent global observations of land, ocean, and atmosphere.It is widely used for environmental and geological studies.
SAR Interferometry (InSAR) measures ground deformation by comparing radar images over time.It is highly effective for landslide monitoring and earthquake displacement.
