Hyperspectral Imagers are not commonly used in coastal and marine remote sensing due to their high cost and complexity.

SAR is able to penetrate clouds and darkness, making it ideal for coastal and marine remote sensing in all weather conditions.

Image classification is not a data processing technique, but rather a post-processing technique used to extract information from remote sensing data.

Remote sensing is used for a variety of applications in coastal and marine environments, including monitoring coastal erosion, detecting oil spills, and mapping coral reefs.

Data scarcity is not a challenge associated with coastal and marine remote sensing, as there is a wealth of data available from various satellite sensors.