Définition
Radiometric resolution is the ability of a satellite sensor to detect and distinguish between different levels of reflected or emitted radiation from the Earth's surface. It refers to the number of digital values that a sensor can use to represent the intensity of the radiation it detects.
In simple words, radiometric resolution is the ability of a satellite to distinguish between different shades of color or gray in an image. A higher radiometric resolution means that the satellite can detect smaller differences in the intensity of the reflected or emitted radiation, resulting in a more detailed image.
For example, a satellite with 8-bit radiometric resolution can represent the intensity of reflected or emitted radiation using 256 different values, while a satellite with 16-bit radiometric resolution can represent the intensity using 65,536 different values. The latter would be able to capture more subtle differences in color or intensity, resulting in a more detailed and accurate image.
Radiometric resolution is important in applications such as remote sensing and scientific research, where it is necessary to distinguish between subtle differences in the Earth's surface. For example, a high radiometric resolution is required to accurately map changes in vegetation cover, or to detect the presence of minerals or other materials in the Earth's crust.
In summary, radiometric resolution is an important characteristic of satellite sensors that determines the level of detail and accuracy of the images they capture. It plays a crucial role in many applications of satellite imagery, from environmental monitoring to geologic exploration.
