Easy Trace does not sew together lines at nodes of high order (3 and more). Thus, tributaries break the line of a river into segments. Joining of long segments into one line is a tiresome task that may be simplified in the following way:

- Select the first line segment with the Editor;
- Start the Join Polylines mode (the hot key «Е»);
- Click the segment to join;
- Press «С» (navigate to the start/end point of the line) when line ends disappear beyond the bounds of the screen;
- Continue joining.

It is convenient to make the operation in a large scale oа screen output. Line end gets into the center of the screen when you press «С» and you continue joining almost without moving of the mouse.

P. S.
Nodes of high order do not hinder the program from autodetection of objects. For example, symbols of mounds and pits consist of numerous short segments but the program recognizes them as a circle or polygon respectively.

P. P. S.
Our programmers are already developing automatic joining of the «main channel» at T-joint processing during vector filtering.