Class for loading contexts of sphere photos in plain TXT format. Each line of data contain information about one sphere photo. Each values in line are delimited by one or more spaces.

Order of values:

time photo-name x-coord y-coord z-height roll-angle pitch-angle heading-angle

Example of line:

34219.267293 150322_092944659 -608333.861 -1160811.862 349.502 1.42076 -4.59133 158.22403