PX4 Fixed Wing Auto Landing

Assalamualaikum and Hello.

I have 2 questions about landing.

  1. What is the use of Landing Pattern in Mission? As we have set the landing parameters in (Fixed Wing Landing | PX4 User Guide). This is because, the Landing Pattern requires operator to key in the final approach altitude, and the glide slope angle/range.

  2. What is the Land mode is use in px4 QGC? And will the fixed wing loiter around the land point or land straight down to 0 meter?

  3. What are the differences or similarities between (1) and (2).