[A-CG36] Terrestrial monitoring using new-generation geostationary satellites

[ACG36-10] Geometric registration of Himawari/AHI and Fengyun-4/AGRI

*Masayuki Matsuoka¹, Hiroki Yoshioka², Kazuhito Ichii³ (1.Mie University, 2.Aichi Prefectural University, 3.Chiba University)

Keywords:Orthorectification, Geometric accuracy, GEO-GEO/GEO-LEO

New generation geostationary earth orbit (GEO) sensors, Himawari, GOES-R, Fengyun-4, and GeoKompsat-2, give the opportunities to observe the earth with higher temporal frequency with various spectral wavebands. The combinations of GEO and low earth orbit (LEO) sensors, or GEO-GEO sensors help us to understand the status and change of the land surface. The high geometric accuracy is essential for the analysis of GEO-LEO or GEO-GEO data to correspond the geolocations. In this study, the geometric registration of two GEO sensors, Advanced Himawari Imager (AHI) onboard Himawari and Advanced Geostationary Radiation Imager (AGRI) onboard Fengyun-4, was performed. Orthorectification was applied for both images to compensate for the displacement due to the terrain height. The method is based on ray-tracing indirect scheme using satellite position and terrain height data. For terrain, we calculated the height from earth ellipsoid by adding the Global Multi-resolution 135 Terrain Elevation Data 2010 (GMTED 2010) and geoid height of Earth Gravitational 136 Model 2008 (EGM2008). The diurnal time series of AHI and AGRI were geometrically reprojected to the same map projection (latitude-longitude projection) and were compared to evaluate relative geometric accuracy. The relative error of geolocation could be corrected by adjusting the geometric parameters of AGRI. In addition, both images were compared with high spatial resolution LEO sensor, Sentinel-2 MSI, for the evaluation of absolute geolocation.