Nop schrieb:
And I don't agree that this would be a derived work. OSM does not contain any DEM data or contour lines, so by adding them the OSM layer remains unchanged and clearly discernible from the contour lines, so I would say the result is a collective work.
Discernible is not enough. You need to read through the full legalese. A collective work is defined as a collection of unmodified entities. This is definitely not true for a gmapsupp.img.
Took me a while to understand and believe how bad the current OSM licence is, too. Thank you for the clarification. So maybe I should add an option to put the contours into a separate IMG file. Right now you could achieve this by using an input file which contains no data but the bounding box.
I think using one IMG has the advantage that using a TYP file you can specify the drawing order (first the "background" polygons, than the contours, then the streets). Best wishes Christian