The sun is the primary source of energy for remote sensing, as it emits electromagnetic radiation that interacts with the Earth's surface and atmosphere.

Radio waves are a type of mechanical wave, not electromagnetic radiation.

Image acquisition is the process of capturing electromagnetic radiation reflected or emitted from the Earth's surface using sensors mounted on satellites, aircraft, or other platforms.

LiDAR (Light Detection and Ranging) sensors are not commonly used in remote sensing, as they are typically used for topographic mapping and surveying.

Data analysis is the process of extracting meaningful information from remote sensing data through various techniques such as image processing, classification, and statistical analysis.

Hydrological modeling is not a common type of data analysis technique used in remote sensing, as it is typically used for water resource management and planning.

Geospatial processing is the process of combining and analyzing data from multiple sources to create a comprehensive understanding of a geographic area.

Metadata is not a common type of geospatial data, as it is information about the data, not the data itself.

Cartography is the process of creating a map from geospatial data.

Azimuthal Equidistant projection is not a common type of map projection, as it is typically used for navigation and not for general mapping purposes.

Geospatial problem solving is the process of using GIS to solve real-world problems.

Medical diagnosis is not a common type of geospatial problem, as it is typically not solved using GIS.

Geospatial modeling is the process of using GIS to create a model of a real-world system.

Economic model is not a common type of geospatial model, as it is typically not created using GIS.

Geospatial decision support is the process of using GIS to create a decision support system.