If we have 9 items on each can we recognize the height of each from the surface of the earth by the useofRFID
Answer:
I don't think you can use RFID for this purpose.
RFID either recognizes a tag (within its range) or it doesn't (because it is too far away). It doesn't measure distance.
The only way you can achieve what you describe is by giving each of the 10 tags (one is on the ground) a different code and evaluate on your receiver which ones you receive and which ones not. But that is only a "greater than / less than"-method.
The method I would use is with an ultrasound range finder, and the 9 objects-to-be-measured are slightly offset from true vertical. You then swivel the range finder back-and-fro, and you will get the distance from range finder to the ground, as well as the distance of each of the 9 items from the range finder. The rest is math.
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