TY - JOUR
T1 - Preparation of GLI-MERIS-AATSR inter-calibration using selected snow and ocean ground sites
AU - Nieke, Jens
AU - Asanuma, Ichio
AU - Hori, Masahiro
AU - Wakabayashi, Hiroyuki
AU - Aoki, Teruo
PY - 2002
Y1 - 2002
N2 - To deliver high quality data sets to the user community, space sensors have to be calibrated with high accuracy. Besides pre-launch and on-board calibration, there exists the possibility to inter-compare the sensor data using well-characterized ground sites. To cover different radiometric signal levels, ground sites with high and low spectral reflectance (and surface temperatures) were chosen to allow not only an absolute signal comparison, but also an estimation of the linearity of the sensor signal. This is why one ground site is located at in the dark ocean (East china sea), and the other is a fresh snow site in the polar region (alternating: Arctic and Antarctic cal sites). These polar sites have the advantage to compare sensors from different sun-synchronous orbit satellites platforms on the same day, i.e. semi-simultaneous measurements can be performed. The dark ocean site will be located near Ishigaki Island (Japan) at 24°37′N and 123°27′E using optical buoy data and frequent in-situ measurements. The snow target sites are in the Antarctic and Arctic, where measurements will be carried out in the polar autumn and spring near Syowa Station (East Ongul Island, Lützow-Holm Bay, East Antarctica; 69 °S and 39°35′E) and near Barrow (Alaska, USA; 71°16′ N, 156°50′W). In the scope of the project the ground sites will be characterized (depending on logistical and weather conditions), to allow an estimation of the TOA signal, which will be calculated using either developed codes or generated products. After systematic (space sensor and ground-truth) data acquisition and analysis, a comparison between these space sensors will be provided to assess long-term variations and trends in the calibration. This paper describes the ongoing preparation (e.g., data selection, ground truth measurements and algorithm development) for a systematic inter-sensor comparison of the GLI and MERIS/AATSR sensors, which are onboard of ADEOS-2 and ENVISAT satellites.
AB - To deliver high quality data sets to the user community, space sensors have to be calibrated with high accuracy. Besides pre-launch and on-board calibration, there exists the possibility to inter-compare the sensor data using well-characterized ground sites. To cover different radiometric signal levels, ground sites with high and low spectral reflectance (and surface temperatures) were chosen to allow not only an absolute signal comparison, but also an estimation of the linearity of the sensor signal. This is why one ground site is located at in the dark ocean (East china sea), and the other is a fresh snow site in the polar region (alternating: Arctic and Antarctic cal sites). These polar sites have the advantage to compare sensors from different sun-synchronous orbit satellites platforms on the same day, i.e. semi-simultaneous measurements can be performed. The dark ocean site will be located near Ishigaki Island (Japan) at 24°37′N and 123°27′E using optical buoy data and frequent in-situ measurements. The snow target sites are in the Antarctic and Arctic, where measurements will be carried out in the polar autumn and spring near Syowa Station (East Ongul Island, Lützow-Holm Bay, East Antarctica; 69 °S and 39°35′E) and near Barrow (Alaska, USA; 71°16′ N, 156°50′W). In the scope of the project the ground sites will be characterized (depending on logistical and weather conditions), to allow an estimation of the TOA signal, which will be calculated using either developed codes or generated products. After systematic (space sensor and ground-truth) data acquisition and analysis, a comparison between these space sensors will be provided to assess long-term variations and trends in the calibration. This paper describes the ongoing preparation (e.g., data selection, ground truth measurements and algorithm development) for a systematic inter-sensor comparison of the GLI and MERIS/AATSR sensors, which are onboard of ADEOS-2 and ENVISAT satellites.
UR - http://www.scopus.com/inward/record.url?scp=0036454833&partnerID=8YFLogxK
U2 - 10.1117/12.456696
DO - 10.1117/12.456696
M3 - 会議記事
AN - SCOPUS:0036454833
SN - 0277-786X
VL - 4814
SP - 230
EP - 242
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
T2 - Earth Observing Systems VII
Y2 - 7 July 2002 through 10 July 2002
ER -