[talk-au] More on the survey tag

John Smith deltafoxtrot256 at gmail.com
Thu Sep 24 11:39:36 BST 2009


2009/9/24 Elizabeth Dodd <edodd at billiau.net>:
> On Thu, 24 Sep 2009, John Smith wrote:
>> > If you think in the Venn diagram
>> > source=survey is a big box
>> > source=gps is a subset of that box
>> > and then some other subsets of gps would be needed
>>
>> GPS on it's own isn't more meaningful either, not without knowing the
>> hardware used, since most surveys will be using consumer grade GPS
>> anyway.
> ideas for subsets
> gps_chip=antaris/sirfstar3/mediatek/trimble/
> gps_model=
> hdop=
> pdop=
> (precision would be some rough figure for the track, i wouldn't want to see
> them on each single node)
>
> then we could note if additional survey techniques used like
> differential_gps=yes (default=no)
> and (cheating off an unpublished essay) we could discuss if an improved
> antenna was used
> and what algorithms are used by the GPS chip to improve results

Exactly and without all that there is no point using GPS over survey.




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