‘Aerial photography, satellite imagery, and radar are all examples of A GPS B remote sensing C GIS D weather forecasting’
The Correct Answer and Explanation is:
The correct answer is: B. Remote sensing
Explanation:
Aerial photography, satellite imagery, and radar are all tools used in the field of remote sensing. Remote sensing refers to the science and technique of obtaining information about objects or areas from a distance, typically from aircraft or satellites. These tools collect data about the Earth’s surface without making physical contact with the area being observed.
Aerial photography involves capturing photographs from aircraft flying at various altitudes. These images are used for mapping, environmental monitoring, urban planning, and more. Aerial photos provide high-resolution visuals that help researchers and planners analyze land use and surface features.
Satellite imagery uses sensors mounted on satellites orbiting the Earth to capture images across various spectral bands. These images help scientists monitor large-scale changes such as deforestation, glacier retreat, ocean temperatures, and urban sprawl. Some satellites are equipped with specialized sensors that can detect things beyond the visible spectrum, including infrared and thermal radiation.
Radar, particularly synthetic aperture radar (SAR), uses radio waves to detect physical features on the Earth’s surface. Unlike optical sensors, radar can operate in all weather conditions and at night, which makes it valuable for consistent monitoring. Radar systems send signals to the ground and measure how they bounce back to construct images and gather data on surface roughness, elevation, and movement.
GPS, or Global Positioning System, is a navigation tool that uses satellite signals to determine precise locations on Earth. It is not primarily used to collect imagery or environmental data, so it does not fall under remote sensing.
GIS, or Geographic Information Systems, is used to analyze and visualize spatial data, often using remote sensing inputs, but it is not a method of data collection itself.
Weather forecasting uses data from multiple sources, including remote sensing, but it is an application, not a method.
