Re: [Gpsbabel-misc] Position accuracy

[Craig B. <cb...@iw...>]

Hello Giorgio,
Would a gps file of sbp or sbp type include positional data? Can the horizontal dilution is precision (HDOP) be determined? I document HDOP in my GPS project as a measure of accuracy. Is this a solution?
Craig Bergh

Sent from my iPhone

> On May 6, 2017, at 8:48 PM, Robert Lipe <rob...@gp...> wrote:
> 
> 
> 
>> On Sat, May 6, 2017 at 5:43 PM, Giorgio Moscardi <gi...@su...> wrote:
>> Hi,
>> 
>> as I have already mentioned some time ago, I have built my own GPS
>> logger with the Arduino platform, which produces unicsv files. I then
>> process the created files with gpsbabel to turn them into GPX. It
>> works well enough for my needs.
>> 
>> Now I would like to add the possibility of recording position accuracy
>> data, which I receive through the $GPGST NMEA sentence, but I can't
>> see any suitable field in the unicsv description page to put such an
>> information in. Any hints?
> 
> We don't parse GPGST as it's out of bounds for the types of data this project focuses on. Adding it to our NMEA parser would be pretty mechanical if you have only one GPS type that you care about.
>  
>> Can I just add my own fields? Will gpsbabel
>> just ignore then?
> 
> You have the source. You're welcome to add anything you like.
> 
>  
>> Also, does GPX provide any fields for this?
> 
> Not really, because it's not really a concept that ports well between devices and formats which (like ours) is the point of that format. If  you're just looking for a field to smuggle it in, you could use the dilution of precision members. That's already in our unicsv handler. It'd be easier than creating an gx:extension.
> 
> http://www.topografix.com/gpx/1/1/gpx.xsd 
> 
> If you control all the software involved and not really interested in interchange like we are, you could put it in heart rate or crank cadence or lots of other square holes.
> 
> RJL
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