ZY-3

ZY-3 is China’s first domestic civilian high resolution stereo surveying and mapping satellite. It was launched on Jan. 9, 2012, carrying 4 optical cameras, which include a 2.1m ground resolution panchromatic nadir view TDI CCD camera, two 3.6m ground resolution panchromatic front/back view TDI CCD cameras and a 5.8m ground resolution nadir view multispectral camera. Images from this satellite are mainly used for making topographic maps, elevation modeling, resource investigations etc. The satellite’s service life is 5 years; it can continuously, stably, and quickly acquire stereo panchromatic images, multispectral images and other supporting data. The images from ZY-3 cover the area within latitudes 84 degrees north and south.

ZY-3 Satellite Specifications
Item Specifications
LAUNCH VEHCLE CZ-4B carrier rocket
LAUNCH SITE Taiyuan Satellite Launch center
SATELLITE WEIGHT 2630 kg
MISSION DURATION 5 years
ORBITAL ALTITUDE 506 km
ORBITAL INCLINATION 97.421°
EQUATOR CROSSING TIME 10:30 am
ORBITAL TYPE Sun Synchronous
ORBITAL PERIOD 98 min
ZY-3 Sensor Specifications
Item Specifications
CAMERA MODE&GSD Panchromatic front/forward / backward view;Multispectral front view
RESOLUTION Panchromatic:2.1 m(Nadir View) / Multispectral 5.8 m ;Panchromatic:3.6 m(Forward / Backward View)



WAVELENGTH
Panchromatic:450 nm-800 nm


Multispectral
Blue:450 nm-520 nm
Green:520 nm-590 nm
Red:630 nm-690 nm
Infrared:770 nm-890 nm
SWATH WIDTH Panchromatic:50 km(Nadir) / 52 km(F/B);Multispectral:52 km
REVISIT TIME 5 days
ACQUISITION AMOUNT/DAY Panchromatic:1,000,000 km²/day; Fusion: 1,000,000 km²/day
ZY-1 02C

The ZY-1 02c surveying and mapping satellite is referred to simply as ZY-1 02c. It was successfully launched on Dec. 22, 2011. ZY-1 02c was equipped with a panchromatic multispectral camera and a panchromatic high resolution camera. The main task of ZY-1 02c is to acquire panchromatic multispectral images for usages of land resources surveying and monitoring, disaster prevention and reduction, agriculture and forestry and water conservancy, environment, and other important national projects.

ZY-1 02C Satellite Specifications
Item Specifications
ORBITAL TYPE Sun Synchronous
ORBITAL ALTITUDE 780.099 km
ORBITAL INCLINATION 98.5°
RETURN CYCLE 55 days
DECENDING NODE LOACAL TIME 10:30 am
ZY-1 02C Sensor Specifications
Satellite Payload Band number Spectral range(μm) Spatial resolution(m) Swath width(km) Swing angle Revisit time



ZY-1 02C



P/MS camera
1 0.51 ~0.85 5


60



±32º



3
2 0.52~0.59 10
3 0.63~0.69 10
4 0.77~0.89 10
HR camera —— 0.50 ~0.80 2.36 One:27;Tow:54 ±25º 3

GF-1

GF-1 is the first satellite in the Chinese high resolution earth observation system. It was launched on Apr. 26, 2013, carried by the LM-2D rocket. This successful launch started the new era of earth observation of china. The GF-1 is equipped with a 2-meter resolution panchromatic camera, an 8-meter resolution multispectral camera and four 16-meter multispectral large format cameras; the swath width is up to 800km. The GF-1 has made several technical breakthroughs. They are in optical remote sensing, which has combined high spatial resolution, high temporal resolution and multispectral technics; in high load images mosaic and fusion, in high accuracy and high stability satellite attitude control, in high resolution data processing and application, and in prolonging the satellite’s service life to 5-8 years.

GF-1 Satellite Specifications
Item Specifications
ORBITAL TYPE Sun Synchronous
ORBITAL ALTITUDE 645 km
ORBITAL INCLINATION 98.0506°
DECENDING NODE LOACAL TIME 10:30 am
SWING ANGLE ±25º, every side swing takes less than 200 sec. ±35º in emergency situations.
GF-1 Sensor Specifications
Item 2-meter resolution panchromatic camera/8-meter resolution multispectral camera 16-meter multispectral camera



SPECTRAL RANGE
Panchromatic 0.45~0.90 μm ——


Multispectral
0.45~0.52 μm 0.45~0.52 μm
0.52~0.59 μm 0.52~0.59 μm
0.63~0.69 μm 0.63~0.69 μm
0.77~0.89 μm 0.77~0.89 μm

SPATIAL RESOLUTION
Panchromatic 2 m
16 m
Multispectral 8 m
SWATH WIDTH 60 km(2 cameras ) 800 km(4 cameras)
REVISIT CYCLE(side swing) 4 days ——
COVERAGE CYCLE 41 days 4 days

GF-2

The GF-2 remote sensing satellite was successfully launched on Aug. 19, 2014, at Taiyuan Satellite Launch Center. It was carried into space by China’s Long-March 4-B rocket. The GF-2 solved the system design problem and improved the camera performance by making the camera with a long focal length, high F number and light weight; it also overcame several other difficulties including high precision image positioning and prolonged low-earth orbit remote sensing satellite service life. It has high radiometric resolution and high accuracy of positioning, and is able to quickly adjust its attitude. Its spatial resolution is better than 1 meter, marking the start of China’s high resolution remote sensing satellite era. The GF-2’s main customers are the Ministry of Land and Resources, the Ministry of Housing and Urban-Rural Development, the Ministry of Transport, etc.

GF-2 Satellite Specifications
Item Specifications
ORBITAL TYPE Sun Synchronous
ORBITAL ALTITUDE 631 km
ORBITAL INCLINATION 97.9080°
DECENDING NODE LOACAL TIME 10:30 am
SWING ANGLE ±35º,every side swing takes less than 180 sec.
GF-2 Sensor Specifications
Item 0.8-meter resolution panchromatic camera/3.2-meter resolution multispectral camera



SPECTRAL RANGE
Panchromatic 0.45~0.90 μm


Multispectral
0.45~0.52 μm
0.52~0.59 μm
0.63~0.69 μm
0.77~0.89 μm

SPATIAL RESOLUTION
Panchromatic 0.8 m
Multispectral 3.2 m
SWATH WIDTH 45 km(2 cameras)
REVISIT CYCLE(side swing) 5 days
COVERAGE CYCLE 69 days

GF-4

GF-4 was launched at Xichang Satellite Launch Center. It is China’s first geosynchronous-orbit remote-sensing satellite, carrying a staring camera which has 50-meter resolution invisible light, 400-meter resolution medium wave infrared, and more than 400 kilometers in swath width. The staring camera has used area array staring imaging technology, and has the capability of visible spectrum imaging, multi-spectral imaging and infrared imaging. The GF-4 provides instant, reliable and stable optical remote sensing data for forestry, earthquake, meteorology and other uses, offering a new method for environmental monitoring and disaster prevention and reduction, and starting a new area of China’s geosynchronous orbit high-resolution remote-sensing satellite earth observation.

GF-4 Satellite Specifications
Item Specifications
ORBITAL TYPE earth Synchronous
ORBITAL ALTITUDE 36000 km
FIXED POSITION 105.6°E
GF-4 Sensor Specifications
Satellite Payload Band number Spectral range(μm) Spatial resolution(m) Swath width(km) Revisit time



GF-4



VNIR
1 0.45~0.90



50




400




20 s
2 0.45~0.52
3 0.52~0.60
4 0.63~0.69
5 0.76~0.90
MWIR 6 3.5~4.1 400