I do see two different topics here:
of vector and raster on one hand and Chart Layers
as a second concept
. The second case is interesting for charts with a defined opacity or charts with completely transparent areas where you want to see the underlying chart. Charts with holes if you want so.
The latter is the case in our sounding chartlet - instead or in addition of defining a polyline in the draw plug-in. The chartlet has the advantage that it will be portable even between different chart plotters.
Now the issue of quilting. It surprises me that this did not pop-up earlier by people that are using raster and vector in zones where both type of charts are in play. Or in the case of GE2kap generated charts in a vector envionment.
In the case of (S-57) ENCs we know that they are grouped by usage/scale
1 - Overview, 2 - General, 3 - Coastal, 4 - Approach, 5 - Harbour, 6 - Berthing and that charts of the same usage group shall not overlap. They are tiled.
So choose the best available scale independent from the type or group of charts to compose the quilted view.
For conflicts allow to hide group of charts (usage, Raster or Vector) as we have already the possibilty from the chart piano for single
charts or CMs that are seen as asingle chart a the piano.
Conflicts: Raster and vector charts with the same scale or within the same usage band covering the same or overlapping zones. Count that the Hydrographic offices are issuing the same charts as raster and vector.
In oder the understand better: what is special with the CMs so that they lend to be quilted?
For sure I will have overseen issues but just to start a discussion and to have a clear idea about the object.
And how do you handle this situation today?