I am planning to create a small topo layer area, this autumn or this winter. Currently, the only documentation I’ve found is on the old wiki archive : https://old.opengeofiction.wiki/index.php/OGF:Making_a_topo_layer and the related Talk page.
So I understand that the described method is to draw contour lines, with contour=elevation and ele=N on a separate file, then send it to the admin team.
Will there still be this possibility in the future? Is it worth starting ?
Is it mandatory to map one curve every X meters (i.e. 10 meters), or not ?
Is drawing by hand on JOSM the only method, or did anyone use another method, like heightmap images ? On some countries with topo layer coverage, there are quite a few artifacts that are typical of some computer-generated heightmaps like here: https://opengeofiction.net/#map=12/-20.3116/122.2140&layers=V
Quite technical question: If I map i.e. a rectangle on my country, it will create an artifact at the border of the rectangle with all contour lines leading to zero, like there: https://opengeofiction.net/#map=13/-44.9911/146.0147&layers=V If I want to add a topo layer for a new rectangle one year later, how to prevent at best the overlapping problem that it may cause on the join line of the 2 rectangles ? Is it better to keep the 1st rectangle’s OSM file, then add the 2nd rectangle’s topo curves and reimport both ?
Also, when I send to the admin, should I close all the contour lines manually on the side of the rectangle or is it done server-side ?
Best regards, SC.