There was a real Colonel Everest who measured meridians, plus a Monsieur Palander, and Professor Strüve may have been the inspiration for Strux.
I hope this isn’t old news. I found the source (that I have linked to) when I searched for newspaper printings of the novel (in German).
A "Martin Paz Soldan" is mentioned as one of the authors of "Géographie du Pérou", but that seems to be a misprint from 1863.
… so it’s very much possible that Verne knew it. And maybe used it as a source for the story… if it was available in French even back then. (The work is about Peru and Verne’s story is set in Peru.)