Once we have a location candidate from EarthLoc-based retreival, we apply the EarthMatch procedure. We begin with matching the astronaut photo query $Q$ (left) and the candidate $C_0$ (right) to produce a first homography $H_0$. Since applying this homography directly to $C_0$ may produce uncovered regions, if the query and candidate do not well overlap, we generate the candidate surroundings $C_s$ and apply $H_0$ to this larger area to produce $C_1$. $C_1$ is then matched with $Q$, producing $H_2$ which applied to a new $C_s$ yields $C_2$. This iterative process continues for a fixed number of iterations or until convergence. In general, the number of inlier matches increases steadily for each iteration. Use the slider to observe the different matching iterations. For more info, see Section 3.2 of the EarthMatch paper.. Below are four visualizations of a query and how the candidate changes across iterations while applying the computed homography.