Ali M3501 B1 Software

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A Systematic View of Remote Sensing

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M3501

1.2.5 Data Characteristics

The specifications of the platform and the sensor determine the resolutions of the remotely sensed data: spatial, spectral, temporal, and radiometric.

1.2.5.1 Spatial Resolution

Ali M3501 B1 Software

Ali M3501 B1 Software

Spatial resolution is a measure of the smallest object that can be resolved by the sensor, or the ground area imaged for the instantaneous field of view (IFOV) of the sensor, or the linear dimension on the ground represented by each pixel. Figure 1.3 shows the campus of the University of Maryland at College Park at four different spatial resolutions. Table 1.4 shows the spatial resolution of some common sensors.

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TABLE 1.4. The basic characteristics of some commonly used sensors

Satellite sensorsSpectral bandsSpatial resolution (m)Radiometric resolution (bits)Temporal resolution (day)Temporal coverage
Coarse resolution (> 1000 m)POLDERB1-B967124POLDER 1: October 1996 to June 1997
POLDER2: April to October 2003
Medium resolution (100–1000 m)MODISB1-b225012daily1999
B3-b7500
B8-b361000
AVHRRB1-B51100 at nadir10daily
Fine resolution (5-100 m)ALI/EO1
ASTER/TerraB1158
B2-B930
B11-B149012
ETM+/Landsat7Pan158161999-
B1-B5,B730
B660
HRV/SPOT5Pan2.5 or 5826/2.42002-
B1-B310
SW-IR20
Very high resolution (< 5 m)IkonosPanchromatic band0.82 at nadir113 days at 40° latitude1999-
B1-b43.2 at nadir
QuickbirdPan0.61111-3.52001-
B1-B42.44
World viewpan0.5 at nadir111.7-5.92007-
Geoeye-1pan1.41 at nadir112.1-8.3 days at 40° latitude2008-
B1-B41.65 at nadir

1.2.5.2 Spectral Resolution

The spectral resolution describes the number and width of spectral bands in a sensor system. Many sensor systems have a panchromatic band, which is one single wide band in the visible spectrum, and multispectral bands in the visible-near-IR or thermal-IR spectrum (see Table 1.4). Hyperspectral systems usually have hundreds of spectral narrow bands; for example, Hyperion on EO-1 satellite has 220 bands at 30-m spatial resolution.

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1.2.5.3 Temporal Resolution

Temporal resolution is a measure of the repeat cycle or frequency with which a sensor revisits the same part of the Earth’s surface. The frequency characteristics are determined by the design of the satellite sensor and its orbit pattern. The temporal resolutions of common sensors are also shown in Table 1.4.

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1.2.5.4 Radiometric Resolution

Radiometric resolution refers to the dynamic range, or the number of different output numbers in each band of data, and is determined by the number of bits into which the recorded radiation is divided. In 8-bit data, the digital numbers (DN) can range from 0 to 255 for each pixel (28 = 256 total possible numbers). Obviously more bits results in higher radiometric accuracy of the sensor, as shown in Figure 1.4. The radiometric resolutions of common sensors are shown in Table 1.4.