Raster data consists of pixels arranged in a grid, each representing a value such as elevation or spectral intensity.This contrasts with vector data which uses points, lines, and polygons.
18.
Which remote sensing technique is most effective for detecting surface roughness and subsurface features?
Radar imaging uses microwaves that penetrate clouds and surface materials to reveal surface roughness and subsurface features.It works regardless of lighting or weather conditions.
19.
What does the acronym 'NDVI' stand for in remote sensing?
NDVI (Normalized Difference Vegetation Index) is a widely used vegetation index calculated from red and near-infrared spectral bands to assess vegetation health and density.
20.
In GIS, which analysis is used to determine the best location based on multiple weighted criteria?
Multi-criteria decision analysis (MCDA) integrates various factors weighted according to importance to identify optimal locations.It is extensively used in site selection for engineering projects.
