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Re: [gpsd-users] How do you calculate position uncertainty?

From: Tomalak Geret'kal
Subject: Re: [gpsd-users] How do you calculate position uncertainty?
Date: Mon, 16 Apr 2012 21:09:32 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

On 16/04/2012 19:42, Irene Stefani wrote:
could you explain me what exactly indicate epy and epx (latitude and longitude position uncertainty)? is this a standard deviation of the error in estimated receiver position? do you obtain it from HDOP and PDOP?and how?

Thanks a lot,

Hi Irene

Lines 745-753 of libgps_core.c ( suggest that epx, epy and epv are functions of multiplying the relevant DOP value by some constant uncertainty values (

Hope that helps


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