sharing and utilizing night light remote sensing images of luojia 1...
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Sharing and Utilizing Night Light Remote Sensing Images of Luojia 1-01 (LJ1-01) for SDGs
Prof. Huayi Wu
Vice Director, LIESMARS, Wuhan University
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Luojia 1-01 Night-time Light Remote Sensing Satellite
Optic Axis of Camera
Optic Axis of Star
Sensor 2
Optic Axis of Star Sensor 2
Flight Direction
Launched on June 2, 2018, By Wuhan University
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⚫ Orbit type: Sun-synchronous orbit
⚫ Orbit height: 645 km
⚫ Ground pixel resolution: 130m@645km(sub-satellite point)
⚫ Imaging spectrum segment: 480nm~800nm
⚫ Ground bandwidth:260km×260km@650km
⚫ Imaging mode: Luminous mode + Daytime mode
⚫ Motorized capacity:pitching axis greater than 0.9˚/s
⚫ Three axis stabilization: Better than 0.1˚s
⚫ Attitude determination accuracy:better than 0.05˚
⚫ Total satellite weight:<25kg
⚫ Measurement and control: UHF TT&C system,Clear transmission mode
⚫ Data transmission: X-band,50Mbps
⚫ Designed life: 6 Months
Main Technical Parameters
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The 1st image of LJ1-01
UAE’s Abu Dhabi and Dubai areas,
June.04, 2018.
DMSP
NPP
Annual mean image of DMSP, USA, 2013(Resolution: 2.7km)
Monthly mean image
of NPP,USA,2018.04
(Resolution:800m)
LJ1-01: the 1st Image
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Nightlight remote sensing image of Wuhan by S-NPP/VIIRS
A Comparison
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Nightlight remote sensing image of Wuhan by LJ1-01
A Comparison
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Dark current stripsDetector-to-
detector strips
Hot pixels Vignetting
daytime calibration + nighttime correction
In-Orbit Testing
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Non-uniformity calibration
The max streaking metrics is better than 0.2%
In-Orbit Testing
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Ortho Rectification
In-Orbit Testing
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Color consistency processing
Before After
In-Orbit Testing
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1. Resolution better than 130m;
2. Ground bandwidth 260km;
3. Relative calibration accuracy better than 0.2%(1δ);
4. Absolute radiance calibration uncertainly better than 7% (1δ);
5. Positioning accuracy better than 700 meters without GCPs.
6. Internal accuracy better than 0.5 pixels.
7. Block adjustment accuracy better than 1 pixel without GCPs.
In-Orbit Testing: Conclusions
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Assessing the reconstruction process in northern Iraq
1) The light decreased in Arbil Province;2) In Kirkuk Province, the light in towns
have decreased, but the light of oil and gas wells have increased significantly;
3) The urban light in Ninawa and Sala ad-Din have increased and decreased in different areas.
4) The above phenomenon shows that oil production in northern Iraq is recovering rapidly, but urban power supply shows obvious regional difference. The power supply in Arbil province is particularly scarce.
Example Applications
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1) The light decreased in Arbil Province;2) In Kirkuk Province, the light in towns
have decreased, but the light of oil and gas wells have increased significantly;
3) The urban light in Ninawa and Sala ad-Din have increased and decreased in different areas.
4) The above phenomenon shows that oil production in northern Iraq is recovering rapidly, but urban power supply shows obvious regional difference. The power supply in Arbil province is particularly scarce.
Assessing the reconstruction process in northern Iraq
Example Applications
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The VIIRS nighttime light image in
Yemen in March, 2014
The VIIRS nighttime light image in
Yemen in February, 2018
Example Application: Assessment of the impact of the Yemeni Civil War
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洛杉矶Los Angeles
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墨西哥城Mexico City
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东京Tokyo
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米兰Milan
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开罗+亚历山大港Cairo Alexandria
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上海Shanghai
DEQING
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http://datasearch.hbeos.org.cn:3000/#
Data Open and Free Policy
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LJ1-01 App (Android)
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Master and Ph.D GeoInformatics Programs in WHU
Wuhan University
Faculty of Sciences
School of Resources and Environmental Sciences
(SRES)
Faculty of Information Engineering
School of Remote Sensing and Information Engineering
(SRSIE)
School of Geodesy and
Geomatics
(SGG)
State Key Lab of Information Engineering in Surveying,
Mapping and Remote Sensing
(LIESMARS)
Global Navigation Satellite System (GNSS) Center
Faculty of Engineering
School of Urban Design (SUD)
GeoInformatics
Related
Programs
Academic Staffs: 350
Undergraduate Students: 3,000
Graduate Students: 1,000
Ph.D. Candidates: 500
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Master and Ph.D GeoInformatics Programs in WHU
Master
Master of
Science
⚫ Cartography & GIScience
⚫ Photogrammetry & Remote Sensing
⚫ Geodetics
⚫ GNSS
Chinese
Master of
Engineering
⚫ Geomatics
⚫ Computer Applications
Chinese/
English
Ph.D.
Ph.D. of Science
⚫ Cartography & GIScience
⚫ Photogrammetry & Remote Sensing
⚫ Geodetics
⚫ GNSS
Chinese/
English
Ph.D. of
Engineering⚫ Cartography & GeoInformatics
Chinese/
English
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Master and Ph.D GeoInformatics Programs in WHU
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Some Thoughts on Capacity Building
Opportunities for Dialogue between Young People
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Some Thoughts on Capacity building
Affordable System Training and Practical Education
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Some Thoughts on Capacity building
Open Data and Facilities Accessibility
Riyadh, Saudi Arabia
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Some Thoughts on Capacity building
Cooperate on Education of GeoInformatics for SDGs
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Some Thoughts on Capacity building
Develop Technology of GeoInformatics for SDGs
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Take-away Messages
◼ Luojia 1-01 provides free and open night-time light RS images
◼ WHU provides dual-language Master and Ph.D. Programs for the world
◼ For Capacity Building for supporting SDGs, more opportunities should
be created and especially for young people
Dialogue, Affordable Training, Education, Open Data, Accessible
Facilities, Available Technologies
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Thanks