- Boxes at the top let you select the maximum lags to test, from each point in a feature. These are in grid units. In this case we know the migration should be to the NE, so the values to the south and west are 0.
- All features: For each feature in the original grid, the algorithm will attempt to find a corresponding point in the migrated grid. The score will be the percentage of points that had a match, with the largest percentage being the computed shift. If several shifts have the same score, the computed shift will be the centroid of the points with the tied score.
- Reverse (all): flips the original and migrated grids, the box containing the lags to test, and the resulting lags. This basically finds the motion that must be reversed to go from the migrated feature to an original feature.
