Tuesday, 9 January 2018
Exhibit Hall 3 (ACC) (Austin, Texas)
GOES-R (renamed GOES-16 after reaching orbit) was launched on November 19, 2016 and Himawari-8 was launched on October 7, 2014. The Advanced Baseline Imager (ABI) onboard GOES-16 and the Advanced Himawari Imager (AHI) onboard Himawari-8 are in the same class and have almost identical thermal spectral bands. The pre-launch characterization and on-orbit calibration algorithm are similar for the thermal bands of the two instruments. The comparison between these two instruments will be very useful for assessing sensor calibration, but is challenged by the fact that they image different regions of the Earth. MODIS onboard the Terra and Aqua satellites have operated since 1999 and 2002, respectively. The inter-comparison between their thermal emissive bands is also a useful tool in assessing their calibration consistency and enhancing their product quality. Terra and Aqua MODIS has the same spectral bands and calibration algorithm. In this work, a double difference method is applied for the thermal band comparison between these two GEO sensors, and also between LEO-LEO sensors, using a reference sensor.
The matching spectral bands of the sensors on GEO satellites and the sensors on LEO satellites can be used for the comparisons. This work focuses on bridging the thermal band comparison between LEO-LEO sensors and between GEO-GEO sensors. The double difference method is applied to assess the BT measurements between the two MODIS instruments, using the GOES-16 imager as a bridge. The comparison between ABI and AHI is also performed with bridging by either MODIS. GOES-16 and Himawari-8 are both positioned over tropical ocean regions. Thus, the comparison with simultaneous nadir overpass can provide assessments for brightness temperature (BT) measurements over the ocean surface type. The comparison can also be extended to simultaneous off-nadir measurement over other types of targets that cover different BT ranges. The demonstration of the comparison using L1B data will be presented. The comparison methodology such as resampling, analysis of BT dependency, and comparison uncertainty assessment will also be presented.
The matching spectral bands of the sensors on GEO satellites and the sensors on LEO satellites can be used for the comparisons. This work focuses on bridging the thermal band comparison between LEO-LEO sensors and between GEO-GEO sensors. The double difference method is applied to assess the BT measurements between the two MODIS instruments, using the GOES-16 imager as a bridge. The comparison between ABI and AHI is also performed with bridging by either MODIS. GOES-16 and Himawari-8 are both positioned over tropical ocean regions. Thus, the comparison with simultaneous nadir overpass can provide assessments for brightness temperature (BT) measurements over the ocean surface type. The comparison can also be extended to simultaneous off-nadir measurement over other types of targets that cover different BT ranges. The demonstration of the comparison using L1B data will be presented. The comparison methodology such as resampling, analysis of BT dependency, and comparison uncertainty assessment will also be presented.
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