The slope of the ground is unknown. It is impossible to determine the slope, as information is unavailable, or the building has not been inspected sufficiently to determine the slope of the ground.

HD99_Canada_Brzev_1

This building in Vancouver, Canada was built on a sloped ground, however the slope (in terms of number of degrees) is unknown (S. Brzev)

HD99_Portugal_Brzev_1

Buildings in this street in Lisbon, Portugal were built on a sloped ground, however the slope information is not available (S. Brzev)