[gps-talkusers] HDOP and VDOP
- From: Charles La Pierre <lapierre@xxxxxxxxx>
- To: gps-talkusers@xxxxxxxxxxxxx
- Date: Fri, 12 May 2006 15:04:48 -0700
HDOP and VDOP are Horizontal and Vertical Dilution of
Precision. These are the main contributes to the overall accuracy in
both the Horizontal plane and Vertical Plane. The lower the HDOP the
better your 2D accuracy, the lower the VDOP the better your 3D accuracy.
Here is the technical definition of DOP
DOP - Dilution of Precision
Also Geometric Dilution of Precision (GDOP) [GPS] An indicator of
satellite geometry for a constellation of satellites used to
determine a position. Positions with a higher DOP value generally
constitute poorer measurement results than those with lower DOP.
Factors determining the total GDOP for a set of satellites include,
to name a few, PDOP (Positional DOP), HDOP (Horizontal DOP), VDOP
(Vertical DOP), and TDOP (Time DOP).
Charles.
At 01:30 PM 5/12/2006, you wrote:
As always, the letter G tells you how many satellites are being
received, and the expected accuracy. I have noticed that the letter
Q gives the same information, plus H and V dop. What are they?
Dave
taxation WITH representation isn't so hot, either!
Charles M. La Pierre CTO
Sendero Group, LLC
Lat. 37 15' 25" N Lon: 121 53' 04" W
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