Georeferencer - complete functionality list
If you select manual georeferencing in MapTiler, new windows will pop-up. All you need to do here is to select sufficient number of points from two maps – your image and on-line map, to align them.
The absolute minimum are three points, however, the more control points you assign, the more precise the result will be. The best choice is to pick points on different parts of the map and do it as accurate as possible: this can be accomplished by choosing corners of buildings, crossroads, peaks and other clearly identifiable points.
Georeferencing itself is done by clicking on one map and the same point on the other. Order doesn’t matter, you can first select point in the on-line map and then on your image or vice versa. There is also option to drop a point on one map and insert coordinates for the other one.
Main window contains search button in the very left top corner. By typing village name and clicking search button the referencing map will zoom to the selected place. The autocomplete function is available.
Below is the icon for map switch: you can select from the predefined ones or add a custom map service by pasting URL of WMS or TileJSON server.
Zoom in and zoom out buttons are available on both sides of the window: left one works for referencing map, right one for your image.
On the top you can switch between Side by side view and Overlay, which is available when at least three points are selected on both maps.
Coordinates button gives you overview of already inserted points altogether with inaccuracy. Clicking on the coordinate will bring selected point into central view, hovering will highlight it.
Clip option allows you to crop your image before publishing.
Gear icon on the top right corner gives you option to change way of transformation. All five available methods are described in standalone manual.
On the right bottom you can find lock icon, which grip both maps together and reproduce any move or zoom on one map on the other.
The circle arrow straighten your image for viewing if it is distorted by georeferencing (this is just for easier orientation during georeferencing process, it has no impact on final product).
If you make any mistake during the whole procedure, you can always click on wrongly inserted coordinate on the map and either move it to the correct position or delete it.
Now your image is georeferenced and you can continue with publishing.