On 5/9/2024 5:33 AM, Florian Lohoff wrote:
At least in Germany we have a grid of Basestations which offer their
RTCM 3.1/3.2 Data via NTRIP which is called SAPOS. As there are huge
differences between different states at least in some of them its for
Free.
When I last looked 5 years ago, the
Hi,
On Tue, May 07, 2024 at 12:34:51PM +0200, Hartmut Holzgraefe wrote:
> On 5/5/24 21:40, Greg Troxel wrote:
> > but it (15cm georeferenced aerial images) does not work in tree cover
>
> not having watched the video either, and having just a very basic
> understanding of RTK, but wouldn't
I am used to different procedures, towards the beginning of a construction
operation, a publicly appointed surveyor (Öffentlich bestellter
Vermessungsingenieur) defines a local coordinate system and marks it on the
ground (e.g. marks building outlines, site limits etc.), as well as relates
it to
John Whelan writes:
> I hesitate to say what is relevant to OpenStreetMap. For example many
> trees are mapped but locally we lost about a quarter of them in a
> recent storm. Is mapping all the trees in Canada relevant to
> OpenStreetMap? Keeping the number of trees up to date or even shop
>
I hesitate to say what is relevant to OpenStreetMap. For example many
trees are mapped but locally we lost about a quarter of them in a recent
storm. Is mapping all the trees in Canada relevant to OpenStreetMap?
Keeping the number of trees up to date or even shop opening hours for
that
john whelan writes:
> For some reason building sites, especially large ones, use GPS as a quick
> way to measure things rather than setting up a theodolite which needs a
> trained person to use it.
But this is not relevant to OSM, merely perhaps interesting to nerds
that care about positioning.
For some reason building sites, especially large ones, use GPS as a quick
way to measure things rather than setting up a theodolite which needs a
trained person to use it.
Cheerio John
On Wed, May 8, 2024, 05:39 Martin Koppenhoefer
wrote:
>
>
> sent from a phone
>
> > On 7 May 2024, at 23:56,
sent from a phone
> On 7 May 2024, at 23:56, john whelan wrote:
>
> So if you're building something in a remote location and not buried in the
> forest it might actually be useful.
in remote locations it doesn’t seem very relevant to get cm precision from
GNSS. You could just mark any
Just to take this a little further there is one application that comes to
mind which is construction where accuracy to the cm is useful. Certainly
these days it is used commercially.
So if you're building something in a remote location and not buried in the
forest it might actually be useful.
Hartmut Holzgraefe writes:
> On 5/5/24 21:40, Greg Troxel wrote:
>> but it (15cm georeferenced aerial images) does not work in tree cover
>
> not having watched the video either, and having just a very basic
> understanding of RTK, but wouldn't that basically be affected by
> reflections from
On 5/5/24 21:40, Greg Troxel wrote:
but it (15cm georeferenced aerial images) does not work in tree cover
not having watched the video either, and having just a very basic
understanding of RTK, but wouldn't that basically be affected by
reflections from trees the same way as regular GPS,
john whelan writes:
> It depends on the requirements. I think mapping from Bing imagery is quite
> reasonable and that isn't done to 1 cm accuracy.
Sure. mapping from 15 cm imagery that is actually georeferenced
properly is 100% fine but it does not work in tree cover. Also actually
It depends on the requirements. I think mapping from Bing imagery is quite
reasonable and that isn't done to 1 cm accuracy.
However as you point out there are other solutions and I'm not advocating
one specific solution merely that it exists. If there is a requirement
that needs high accuracy
John Whelan writes:
> Search Youtube for "Andreas Spiess ESP32 precision GPS receiver
> (incl. RTK-GPS Tutorial)" I deliberately haven't put a direct link
> in.
>
> It needs packaging and documenting but I think this sort of
> differential GPS could be very useful in accurate mapping.
comments
Search Youtube for "Andreas Spiess ESP32 precision GPS receiver (incl.
RTK-GPS Tutorial)" I deliberately haven't put a direct link in.
It needs packaging and documenting but I think this sort of differential
GPS could be very useful in accurate mapping.
Cheerio John
--
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