The Snap option is a finishing tool which allows you to move points to a common location to fine tune the presentation of a model. This can be used where walls, gates and fences are required to meet at a single point. This option is only available if no DTM has been formed. You will be asked to indicate a snap point and, because of the nature of this operation, it is likely that more than one point will be found. If this is the case, the dialog box dealing with duplicate points and features will be displayed and you should select the required point from this dialog box. The indicated point is referred to as the snap point and is the point to which other points are to be snapped to. The dialog box shown below will then be displayed.
The details of the snap point are displayed in the top right of the dialog box. To the left of the dialog is a list of the points that have been found that are closer to the snap point than the distance defined in the Search Radius field. If you change the value within this field, you will then need to select the Search button to resample the points.
Initially, each of the sampled points will have a green tick next to it which means that the point will be snapped when the OK button is selected. If you do not want to snap a point, double-click on it and a red cross will replace the green tick. A further double-click will reinstate the green tick. The details of the point that is currently highlighted in the list of points are displayed to the lower right of the dialog. Included here are its offsets from the snap point.
The normal mode for snapping is 3D where the points to move copy the height of the snap point. The 2D Snapping check box allows you to ensure that the moving points retain their original heights.
After you select the OK button, all the points with a green tick will be moved to the location of the snap point and the display will be redrawn.