That's the source photo I used. It was the rooftops that lead me to this picture. I recognised the roof style of the original texture as Swiss, and literally typed "Swiss rooftops" into a well known search engine and went from there. LGS' image is heavily manipulated. I suspect LGS purloined quite a number of source pics from Encarta and publications of that ilk.
I did have to edit out the satellite dishes for the final texture!