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CBERS-1, 2 and 2B Cameras


Stereoscopic View

CBERS-1 and 2
various fields of view


Image Credits: CBERS/INPE.


The CBERS-1, 2 and 2B satellites are designed for global coverage, and include cameras that make optical observations. They carry a Data Collection System transponder to gather data on the environment. They are unique systems due to the use of onboard cameras which combine features that are specially designed to resolve the broad range of space and time scales involved in our ecosystem.

The CBERS-1, 2 and 2B satellites have a sun-synchronous orbit at an altitude of 778 km, completing about 14 revolutions per day. The local solar time at the crossing of the equator is always 10:30 a.m., thus providing the same solar illumination conditions for comparing images taken in different days.

A unique feature of CBERS-1, 2 and 2B is their multi-sensor payloads with different spatial resolutions and image collecting frequencies.

WFI - Wide Field Imager

The WFI has a ground swath of 890 km which provides a synoptic view with spatial resolution of 260 m. The Earth surface can be completely covered in about 5 days.


WFI image
Itaipu Dam

The WFI optical head


Characteristics of the Imaging Instrument WFI
Spectral bands 0.63 – 0.69 µm (red)
µm (infrared)
Field of view 60║
Spatial resolution 260 x 260 m
Swath width 890 km
Temporal resolution 5 days
RF carrier frequency 8203.35 MHz
Image data bit rate 1,1 Mbit/s
EIRP 31.8 dBm


CCD - High Resolution CCD Camera

The CCD camera provides images 113 km wide with 20 m spatial resolution. Since this camera has a sideway pointing capability of ▒ 32 degrees, it is capable of taking stereoscopic images of a certain region. In addition, any phenomenon detected by the WFI may be "zoomed in" by the oblique view of the CCD camera with a maximum time lag of 3 days.

The CCD camera operates in 5 spectral bands including a panchromatic band from 0.51 to 0.73 Ám. The two spectral bands of the WFI are also present in the CCD camera to allow data complementarity between the two types of remote sensing images. A complete coverage cycle of the CCD camera takes 26 days. IRMSS is present in CBERS-1 and -2, but not in CBERS-2B. For CBERS-2B, it was replaced by HRC (High-Resolution Panchromatic Camera).



Characteristics of the High Resolution CCD Camera
Spectral bands 0.51 – 0.73 µm (pan)
0.45 – 0.52 µm (blue)
0.52 – 0.59 µm (green)
0.63 – 0.69 µm (red)
0.77 – 0.89 µm (near infrared)
Field of view 8.3║
Spatial resolution 20 x 20 m
Swath width 113 km
Mirror pointing capability ▒32║
Temporal resolution 26 days nadir view
(3 days revisit using stereo mirror)
RF carrier frequency 8103 MHz e 8321 MHz
Image data bit rate 2 x 53 Mbit/s
EIRP 43 dBm


IRMSS - Infrared Multispectral Scanner


The IRMSS operates in 4 spectral bands, thus extending the CBERS spectral coverage up to the thermal infrared spectral region. It images a 120 km swath with the resolution of 80m (160m in the thermal channel). In 26 days it is possible to obtain a complete global coverage.


View of the Vale do Rio Ašu located in the Rio Grande de Norte State using IRMSS camera

Characteristics of the Imaging Instrument IRMSS
Spectral bands 0.50 – 1.10 Ám (panchromatic)
1.55 – 1.75 Ám (shortwave infrared)
2.08 – 2.35 Ám (shortwave infrared)
10.40 – 12.50 Ám (thermal infrared)
Field of view 8.8║
Spatial resolution 80 x 80 m (160 x 160 m thermal)
Swath width 120 km
Temporal resolution 26 days
RF carrier frequency 8216.84 MHz
Image data bit rate 6.13 Mbit/s
EIRP 39.2 dBm


HRC - High Resolution Camera

HRC camera operates in a single spectral band which covers visible and near-infrared bands. It is only present in CBERS-2B, not in CBERS-1 and -2. It generates images of 27km width and 2.7m spatial resolution, which allows the observation of surface objects with great detail. Given its 27km swath, five 26 days cycles are necessary for the 113km standard CCD swath to be covered by HRC. According to the operational procedure adopted for CBERS-2B, it is possible to obtain, every 130 days, one complete coverage of the country in high resolution. When the complete coverage of the country is ready (after five 26 days cycle), the CCD camera, will have covered the country five times.

Characteristics of the High Resolution Panchromatic Camera - HRC
Spectral Band 0.50 – 0.80 µm (panchromatic)
Field of View 2.1║
Spatial Resolution 2.7 x 2.7 m
Imaged Strip Width 27 km (nadir)
Temporal Resolution 130 days in the proposed operation
Image data rate 432 Mbit/s (before compression)
Quantization 8 bits


Realization
Image Catalog
Brasília (DF)
Images CBERS-2 - Camera CCD
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