On Friday 03 January 2014, Paul Norman wrote: > [...] The > two options are to add a number of discrete sources, or to add a > layer mosaicking them together, and displaying what the best source > is at any one point.
I think this is the primary issue you need to consider. If you are sure you know what the 'best source' is at any point (which in the most general case requires in depth knowledge of the area and of the image data in question) mosaicking might be the best solution (but can be a real lot of work). If on the other hand you plan to just layer the image sources by formal quality measures (like resolution and age) to create the mosaic you will most likely end up with less than optimal quality in some areas. In addition there is of course a significant value of having multiple images available in itself since it allows the mapper to get an idea on how variable images can be. A frequent mistake in common practice armchair mapping is that people regard the image as the truth rather than a most likely inaccurate depiction of the truth. Having several images available can help here. -- Christoph Hormann http://www.imagico.de/ _______________________________________________ talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk
