HUANJING-1A/1B (HJ-1A/1B) was launched on 6 September 2008, HJ-1A is an optical satellite with a multispectral (MS) camera and a hyper spectral (HIS) camera. HJ-1B is also an optical satellite with a multispectral camera and a IRMSS（Infrared multispectral） camera on board.
Its overall objective is to establish an operational Earth observing system for disaster monitoring and mitigation and to improve the efficiency of disaster mitigation and relief. And it mainly applies in the fields such as environmental monitoring and prediction, solid waste monitoring, disaster monitoring and prediction. HJ is the abbreviation for "Huan Jing" - meaning "environment".
Technical Specifciations:
HuanJing-1A (HJ-1A)
| Orbit | Altitude: 650 km | ||
| Type: Sun-synchronous 10:30 am | |||
| Period: 97 minutes | |||
| Mass | 470 kg | ||
| Sensor bands | MS | HIS | |
| 4 multispectral: | |||
| Blue: 430-520 nm | 115 bands:450-950 nm | ||
| Green: 520-600 nm | |||
| Red: 630-690 nm | |||
| NIR: 760-900nm | |||
| Spatial resolution | 30 m | 100 m | |
| Swath width | 700 km | 50 km | |
| Dynamic range | 10 bits | ||
| HuanJing-1B (HJ-1B) | |||
| Orbit | Altitude: 650 km | ||
| Type: Sun-synchronous 10:30 am | |||
| Period: 97 minutes | |||
| Mass | 470 kg | ||
| Sensor bands | MS | IRMSS | |
| 4 multispectral: | 4 bands | ||
| Red: 430-520 nm | NIR: 750-1100 nm | ||
| Green: 520-600 nm | SWIR1:1550-1750 nm | ||
| Blue: 630-690 nm | SWIR2: 3500-3900 nm | ||
| NIR: 760-900 nm | TIR: 105000-125000 nm | ||
| Spatial resolution | 30 m | 150 m | |
| Swath width | 700 km | 700 km | |
| Dynamic range | 10 bits | ||
| Revisit time | 4 days | ||
