A bows draw length is measured from the pivot point of the grip to the bottom of the string groove on the arrow nock when the bow is at full draw. This is the bow’s true draw length, however most manufacturers use AMO draw to determine the draw length of their bows, this is true draw plus 1 ¾”.

In your photo, dimension # 2 is the true draw length. Add 1 3/4" to get the AMO (now ATA) draw length.