I'm developing an application for the indoor navigation. I have image files of the various floors of the building in which to navigate (in pdf/jpeg/bmp...). I also have an Excel file with position (x,y) of vertices with related edges. How i can map this image? there's something to draw a graph above the image? i'm searching possibily something compatible with GraphHopper (i'll use GraphHopper to generate shortest roads thanks to Dijkstra algorithms)
Thanks!!