Does the Rational Function Model’s Accuracy for GF1 and GF6 WFV Images Satisfy Practical Requirements?

The Gaofen-1 (GF-1) and Gaofen-6 (GF-6) satellites have acquired many GF-1 GF-6 wide-field-view (WFV) images. These images been made available for free use globally. WFV rational polynomial coefficients (RPCs). In practical applications, RPC corrections of need to be completed using the function model (RFM). However, can accuracy satisfy application requirements? To address this issue, a geometric method was proposed in paper evaluate RFM First, were refined RFM, respectively. constructed RPCs Shuttle Radar Topography Mission (SRTM) 90 m DEM. via affine transformation based on control points (CPs), which resulted RFM. Then, an automatic matching complete GF-1/GF-6 reference images, enabled us obtain uniformly distributed CPs. Finally, these CPs used 14th-layer Google corresponding area as experiments, advantages disadvantages BRIEF, SIFT, first compared. values root mean square error (RSME) 10,561 Chinese, French, Brazilian calculated statistically analyzed, local distortions evaluated; Last, evaluated eight experimental results indicate that most cannot meet actual requirement being better than 1.0 pixel, meets pixel. RMSE requirements are between 0.9 1.0, further improved.