可視・近赤外域センサ軌道上校正用ターゲットとしての雪原の適性

抄録

Importance of in-flight radiometric calibration of satellite sensors has been increased. A snow field is a candidate as a ground target for vicarious calibration and cross calibration in the visible to near-infrared region because of its high reflectance and spatial uniformity. This study focuses on the advantages and disadvantages of a snow field for in-flight calibration in order to show the validity of a snow field as a ground target. The reflectance data was obtained at the Sarobetsu and the Konsen Plateau areas in Hokkaido, Japan.The snow reflectance was changeable in terms of temporal stability due to a variety of snow grain size, water content and impurities. However, the reflectance of the snow field was nearly flat spectrally in the 400-900 nm region and very uniform spatially. For the some properties of the snow field, the percent uncertainties and the sources of uncertainty or errors for the calibration are estimated. As a result, the snow fields can be selected as a good ground target for vicarious calibration using simultaneous in-situ measurements with data acquisition by satellite sensors and for cross calibration between sensors on the same platform.