Continuing this thread because there is still a coordinate conversion bug in Therion 5.4.4
in coordinate conversion when exporting to KML
I have entered the coordinates in UTM based on a point both from an
actual GPS and from Google Earth (they are the same) in cs epsg:2154
(Lambert 93) or epsg:32631 (WGS84 / UTM 31N)
When I look at the output in UTM again, the entrance has shifted
directly south for 9 meters.
I'm assuming Therion changes the coordinate to something else (more
assumptions... WGS84?) and then changes it back again to the desired
output format. This conversion produces the wrong results I think.
As a workaround, maybe I could enter and export in WGS84 lat/long,
however, when I enter
fix E6 43.811399 3.585060 194 10 10 10
provide this?
Thanks,
Anton
Von: "Martin Budaj via Therion" <therion@speleo.sk>
An: "List for Therion users" <therion@speleo.sk>
Cc: "Martin Budaj" <m.bu...@gmail.com>
Betreff: Re: [Therion] Therion 5.4.2. potential bug
Thank you, Martin, for the quick fix.
Is it also fixed in
https://therion.speleo.sk/downloads/therion-setup-5.4.2.exe
?
Regards,
Michael.
Von: Therion <therion-boun...@speleo.sk> Im Auftrag von Martin Budaj via Therion
Gesendet: Donnerstag, 17. Januar 2019 19:26
An: List for Therion users <therion@speleo.sk>
Cc: Martin Budaj <m.bu...@gmail.com>
Betreff: Re: [Therion] Therion 5.4.2. potential bug
Hi, it's fixed in d98a0a6.
Martin
On Tue, Jan 15, 2019 at 7:28 PM Martin Budaj <m.bu...@gmail.com> wrote:
On Sat, Jan 12, 2019 at 10:51 AM Michael <knollesim...@t-online.de> wrote:
I have now attached a minimal cave sample produced with 5.4.1. and one produced with 5.4.2. to demonstrate the displacement.
Hi,
the problem is that EPSG:31467 projection uses the "potsdam" datum and the PROJ library used by Therion changed the way how to transform potsdam datum to the standard WGS84 datum – it switched from a simple string parameter (towgs84) to using external grid file (see https://proj4.org/resource_files.html#transformation-grids for examples).
No grid files are currently included in the windows Therion distribution, so the transformation is not correct in 5.4.2. Therion needs to be modified to include and use those files – hopefully soon.
Best regards
Martin
_______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
