Skip to main content

Resolution

Speaking of satellite images in day-to-day life, we refer to images acquired by spectral systems of remote sensing most of the time. They use the spectral range of the visible light and infrared to detect the Earth's surface. 
To characterise digital spectral images, the idea of "resolution" is introduced. The best-known type of resolution is the spatial resolution which is present in digital photography as well and is associated with the term "pixel". People with computing knowledge will be familiar with the radiometric resolution of images, as well as with the term "bit". Resolutions characteristic for digital spectral remote sensing systems and their images are spectral resolution and temporal resolution.

 

Auflösung von Satellitenbildern

 

 

 

The spatial resolution signals the size of the section of the surface of the earth which can be depicted in one pixel. The spatial resolution is stated in metre.

 

The radiometric resolution indicates the ability of the sensor to distinguish between grey-scale values. The radiometric resolution is measured in bit.

 

The spectral resolution indicates how well a spectral-digital satellite sensor can distinguish between the different spectral ranges of the electromagnetic spectrum. The spectral resolution is characterised by the number of spectral bands.

 

The temporal resolution indicates the distance of time between the single image acquisitions of the same area. The temporal resolution can be stated in minutes, hours or days.