DX Dy wind field estimation

sorry, i just reach the computer (using lab computer to process)…
here the result within SNAP…

and I want to ask, previously I ask about hot to extract wind direction with dx and dy data. you have answered at Export wind field estimation but when I open the qgis, the rules of atan2 is Y coordinate different first, but you tell me to use dx first. which one should I use ?
kirim%20step%202

thank you