is a measure of the smallest object that can be resolved by the
sensor, or the linear dimension on the ground represented by each
pixel or grid cell in the image [See Image 20].
1 m resolution
2 m resolution
5 m resolution
10 m resolution
20 m resolution
30 m resolution
Image 20: Camp Randall
Stadium, University of Wisconsin, viewed at different resolutions
(Image: University of Wisconsin, Institute for Environmental
describes the specific wavelengths that the sensor can record within
the electromagnetic spectrum. For example, the “photographic infrared”
band covers from about 0.7 – 1.0 micrometers.
Temporal resolution is a description of how
often a sensor can obtain imagery of a particular area of interest.
For example, the Landsat satellite revisits an area every 16 days
as it orbits the Earth, while the SPOT satellite can image an area
every 1 to 4 days.
Radiometric resolution refers to the number
of possible brightness values in each band of data and is determined
by the number of bits into which the recorded energy is divided.
In 8-bit data, the brightness values can range from 0 to 255 for
each pixel (256 total possible values). In 7-bit data, the values
range from 0 to 127, or half as many possible values.