horizontal / vertical

flat and level; going across and parallel to the ground rather than going up and down ตามแนวนอน / going straight up or down from a level surface or from top to bottom in a picture, etc. ซึ่งตั้งตรง

An expert with the British Geological Survey said the tsunamis were small because the quakes' movement was horizontal, not vertical, and caused no drop in the sea floor, which is what triggers tsunamis.

Under the city plan, the eastern part of Bangkok would become less dense with more vertical housing projects, such as condominiums, than horizontal ones.

Since the latitude of Bangkok is about 14 degrees, on average, the sun will make a greater impact on horizontal surfaces than vertical ones.