Remote Sensing Glossary

Revision as of 09:26, 30 May 2013

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A

Atmospheric correction

A pre-processing step for satellite imagery to remove atmospheric effects in order to enhance accuracy of surface reflectance.

B

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C

D

E

F

G

H

I

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J

K

L

M

N

O

P

Pixel

The smallest spatial unit in a digital image. A satellite image is made up of a matrix of pixels, each having its own vector of digital values for each band.

R

Radiometric resolution

Sensitivity (maximum range of values or bandwidth) of the sensor in detecting different intensities of electromagnetic radiation in single spectral bands. Typically recorded in 6 bit, 7 bit, 8 bit, 10 bit or 16 bit per pixel. The contrast of a raster image is depending on radiometric resolution.

S

Spatial resolution

The size of a pixel (corresponding ground area that is covered by a pixel) that is recorded in a raster image – typically pixels correspond to square areas. The recorded spectral reflectance is integrated over a defined ground area (GIFOV = ground-projected instantaneous field of view).

Spectral resolution

Number and wavelength bandwidth of the single spectral bands recorded by a sensor.

T

Temporal resolution

Temporal frequency or revisiting time of the same location on the earth surface of the sensor.

U

V

W

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X