遥感英语

空间分辨率Spatial Resolution
▪Measure of the smallest angular or linear separation between 2 objects that can be resolved by the sensor
▪In practice, sensor system’s nominal spatial resolution is the dimension in meters (or feet) on the ground projected instantaneous field of view (IFOV)
▪Generally, smaller spatial resolution → greater the resolving power of the sensor system 图象的光谱分辨率Spectral Resolution
Number and size of the bands which can be recorded by the sensor –nominal spectral resolution
•Course –sensitive to large portion of ems contained in a small number of wide bands •Fine – sensitive to same portion of ems but have many small bands、
•Goal– finer spectral sampling to distinguish between scene objects and features
More detailed information about how individual features reflect or emit em energy increase probability of finding unique characteristics that enable a feature to be distinguished from other features.
Spectral Resolution
▪Difficult to create detector that has extremely sharp bandpass boundaries such as describe in previous slide
▪More precise method of stating bandwidth is look at typical Gaussian-shape of the detector sensitivity
▪Describe bandwidth as Full Width at Half Maximum (FWHW)
辐射分辨率（ Radiometric Resolution ）
▪Refers to the sensitivity of the sensor to incoming radiance.
▪How much change in radiance must there before a change in recorded brightness value takes place.
▪This sensitivity to different signal levels will determine the total number of values that can be generated by the sensor
图象的时间分辨率（Temporal Resolution）。