Aloha Hans
NAD83 is the North American tectonic plate frame whereas ITRF is
theInternational Terrestrial Reference Frame.
Typically when using coordinates one is highly dependent on historical
data which was locally produced. I first stumbled over this when trying
to map my own payed for geodesic survey (done by a local geometer) onto
a larger plat map when it showed up 180km away in the ocean. Navigating
such problems is not easy as you have to dig through a lot of history.
When you're independent from local data then ITRF seems to be the more
logical choice as it should give you the same calculations no matter
where your measurements have been processed.
Cheers, Werner
On 11/26/25 09:37, Hans Mayer wrote:
Hi Werner,
that's interesting information. Good to know. Thanks.
If you are uploading a file, which processing mode are you selecting:
NAD83 or ITRF ?
Kind regards
Hans
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On 26.11.25 20:30, Werner Thie wrote:
Aloha Hans
to my knowledge one can not select the product type, but if you run
your observations (*.obs no need to zip the file) just after the
capture product type returned is Ultra-rapid. As the obs file ages
positional data of the satellites gets frozen for the epoch the
captures spans and the product type then becomes Final if you ask for
another report with the same obs file after more than two weeks. Se
ChatGPT confirms my assumption when being asked the following question:
/Associated with the calculations and the report from the Canadian
CSRS-PPP service is a product type, which to my knowledge is based
solely on the correctness of the satellites positions which become
better known over time (about two weeks). Calculations done
immediately after a capture get product type Ultra-rapid whereas
older captures (past two weeks old) get product type Final. Is this
about correct?/
HTH, Werner
On 11/26/25 06:59, Hans Mayer wrote:
Hi Werner,
many thanks for this information.
I saw anywhere in the documentation that there are different product
types.
But I didn't see a way to select one or other. Or is there a way ?
Kind regards
Hans
--
On 26.11.25 00:10, Werner Thie wrote:
Aloha
I decided to rerun an older 8h take with the Canadians and found
that they seem to not process GLONASS with their current software
version printed on the head of the pdf report
CSRS-PPP 5.14.0 (2025-08-07) which processes GPS C1 C2 L1 L2 with
product type final
vs
CSRS-PPP 5.13.0 (2025-06-16) which processes GPS C1 C2 L1 L2 and
GLONASS : C1 C2 L1 L2 with product type Ultra-rapid
If it is of interest I can attach the PDFs to a post, I refrained
because of the files being 1.5MB each.
Mahalo, Werner
