空間的不均一性を考慮した地表面BRDF測定システム

スペクトロラジオメータ・デジタルカメラの併用

抄録

The measurement of bidirectional reflectance distribution function (BRDF) of ground surface becomes more important according to the advanced use of satellite optical sensor. Recently, many in-situ instruments have been proposed for the BRDF measurement, and the calculation of the land surface radiation transfer has been attempted.
The target area scale of in-situ measured BRDF is very different from satellite based BRDF, and the in-situ measured BRDF generally shows spatial instability. To validate the satellite based BRDF, it is better to measure the BRDF at the many points in the ground site. However, most of the previous instruments can measure only a few points during the short time when the sun-geometry is unchanged, because the instruments are heavy and it takes a long time to measure the BRDF. In this study, new BRDF measurement system that has a potential to correct spatial BRDF instability using the spectroradiometer and CCD Digital Camera is proposed, and its capability and limitation are discussed.