"Various altitudes" refers to different heights or elevations in relation to a specific reference point, such as sea level or ground level. Full definition
Dawn has been studying Ceres from various altitudes, getting as close as 235 miles (378 kilometers), the distance of the International Space Station above Earth. (orlandosentinel.com)
The HIAPER Pole - to - Pole Observations project initiated the investigation of the carbon cycle and greenhouse gases throughout various altitudes of the Western Hemisphere through the annual cycle. (ibtimes.com)
But the team did find a substantial increase in another known risk factor for tornado formation: a parameter called storm relative helicity (SRH), which is related to the differences in wind speed and direction at various altitudes between ground level and 3 kilometers. (sciencemag.org)