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trajectory info

Posted: February 13th, 2015, 3:17 am
I want to plot trajectories for some episode. I have few queries.
1) At what GMT I should plot my trajectories?
2) I am plotting the back air trajectories so how many days I should select . At present I am checking for dust and selecting 5 days.
3) At present I am trying to plot at 3 altitudes , 500 m AGL , 2000 and 3000 m AGL, which is random at present , what height I should plot and whether AGL or AMSL heights.

I shall be very thankful to you.