Calibration introduction of China land observation satellites
China Center for Resources Satellite Data and ApplicationMay 16, 2014
Pan Zhiqiang
1. Introduction1.1 CRESDA1.2 Land observation satellites of China
2. Calibration site2.1 Dunhuang gobi2.2 Qinghai lake2.3 Etuokeqi grassland2.4 Songshan stationary target
3. GF-1 on-orbit radiometric calibration3.1 site calibration3.2 cross-calibration
OUTLINE
1. Introduction
CRESDA(China Center for Resource Satellite Data and
Application) is the national center for data processing, archiving,
distributing and user service of land observation satellites developed
by China. It is responsible for many series satellite's operational
management, such as China-Brazil resources series satellite,
environment and disaster series satellite, high resolution series
satellite, mapping satellite, and so on.
1. Introduction
With more than 20 years’ development, CRESDA has been constantly improving its capability in satellite ground processing system construction, satellite operational management, satellite remote sensing data application technical research and development, and so on.
1. Introduction
CRESDA has successfully operated 11 satellites , including CBERS-01/02/02B,HJ-1A/1B/1C, ZY-1 02C ,ZY-3 and SJ-9A/B.Now,8 of these satellites are on orbit.
LAND RSSATELLITE
CBERS-01/02/02B
1999.10~2010.04
First land remote sensing satellite of China
SJ-9a/B
2012.10~now
2.5m PAN/10m MUX
GF-1
HJ-1A/B/c
2008.09~now HJ-1A/1BLarge swoth coverage, revisit time 2 days2012.11~now HJ-1C
SAR with 5m resolution
ZY-1 02C2011.12~now2.36m resolution 54km image width
ZY-3 2012.01~nowMapping satelliteDEM production
2013.4~now
GF-1 with 2m/8m resolution.
Satellite Payloadspatial
resolution(m)swath(km) 侧摆能力侧摆能力侧摆能力侧摆能力
Revisit time ((((day))))
HJ-1ACCD 30 700
4HSI 100 50 ±30°
HJ-1BCCD 30 700IRS 150 720
HJ-1C SAR
5(Single vision,strip)
20(4visions,scan)
40(strip)
100(scan)
31°44.5° 4
ZY-1 02CHR 2.36
27(single)54(double)
±25º3~5
PMS5
60 ±32º10
ZY-3
FWD 3.552
±32° 3~5BWD 3.5NAD 2.1
51MUX 6 5
SJ-9APAN 2.5 30 ±35° 69MUX 10 30
SJ-9B TDI 73 18 ±15° 69
GF-1
PAN 2 60±25° 4
MUX 8 60
WFV 16 800 2
1. Introduction
2. Calibration site
2. Calibration site
2.1 Dunhuang gobi
actual view of Dunhuang Gobi
GF-1 image of Dunhuang
Dunhuang Test Site
N40.04 °~ 40.28 °E94.17 °~ 94.5 °
Area 60*40km2
Area: 400m2
Altitude:1229m
The site is constructed with black, gray and white gravel;atmospheric aerosol type : closer to the desert type;Air condition: clean , dry.
2. Calibration site
2.2 Qinghai lake
Qinghai Lake Test Site
Area: 4473km2
Perimeter: 360kmmaximum depth:38maverage elevation:3.196km
36°41'N~36°45'N,100°22'E~100°30'E
high altitudelow aerosol particlescontinental aerosol typeuniform surface temperature
2. Calibration site
2.3 Etuokeqi grassland-SAR calibration
Ground type is mainly made up of grasslands and sandy loam, which has lower scatter properties and relatively stable. Distance range and azimuth range is greater than 100km and 30km respectively, with an area of 130km× 40km. Noise ratio between the calibration reference and background clutter signal is less than 30dB. Topography of the site is less than 20 meters.
2. Calibration site
2.4 Songshan stationary target
For radiation calibration, there are fan- resolution target, blade edge target, a large area of gray target and point source matrix et al.
2. Calibration site
2.4 Songshan stationary target
For geometry calibration, there are two straight lines from the east to west, with the artificial signs in black and white diagonal cross pattern.
3. GF-1 on-orbit radiometric calibration
3.1 site calibration
high reflectance(40%)
gypsum crystal
(6600mx5000m)
Middle reflectance(20%)
gobi(550mx550m)
low reflectance(<10%)
water(2500mx500m)
3. GF-1 on-orbit radiometric calibration
3.1 site calibration
�Dunhuang calibration site- data measurement
�atmospheric parameter - aerosol
�ground parameter -surface reflectance
3. GF-1 on-orbit radiometric calibration
3. GF-1 on-orbit radiometric calibration
3. GF-1 on-orbit radiometric calibration
3.2 cross-calibration
Target sensor
4 Wide Field of View (WFV)
Spatial resolution 16m
Swath 830km
3. GF-1 on-orbit radiometric calibration
3.2 cross-calibration
Reference sensor
VelocityVector
• OBCs: SD/SDSM, BB, SRCA, SV• Lunar observations
SDSM
Scan Mirror
SolarDiffuser
SRCA
Blackbody
SpaceView
3. GF-1 on-orbit radiometric calibration
3.2 cross-calibration
3. GF-1 on-orbit radiometric calibration
3.2 cross-calibration
3. GF-1 on-orbit radiometric calibration
3.2 cross-calibration
201306~201402
26 pairs
16pairs
Cloud
9pairs
3. GF-1 on-orbit radiometric calibration
3.2 cross-calibration
3. GF-1 on-orbit radiometric calibration
3.2 cross-calibration
errorBlue Green Red Near-infrared
number percent number percent number percent number percent
>10% 1 11.1% 0 0% 0 0% 0 0%
5-10% 5 55.6% 1 11.1% 1 11.1% 1 11.1%
<5% 3 33.3% 8 88.9% 8 88.9% 8 88.9%
谢谢谢谢谢谢谢谢!Thank you !