Re: [Therion] Therion 5.4.2. potential bug

Mon, 29 Jul 2019 02:56:00 -0700

Hi Philippe!
 
Thanks... but I'm still getting the utterly useless message:
 
"can't determine meridian convergence for lat-long systems"
 
...when I use the coordinates in WGS84 I already got when I used lat/long instead of long/lat as you suggested. 
 
Cheers,
 
Anton
 
Gesendet: Sonntag, 28. Juli 2019 um 09:10 Uhr
Von: "Philippe Vernant" <[email protected]>
An: "List for Therion users" <[email protected]>
Betreff: Re: [Therion] Therion 5.4.2. potential bug
Hi Anton,
 
Here is what I have for the event de la coudoulière :
 
    cs epsg:2154 #Lambert 93
    fix E6 747080.000 6301550.000 194.000 10 10 10
 
if you convert it to with GDAL you should have :
    cs EPSG:4326   # code WGS84
    fix E6 3.58505 43.81139 194 10 10 10 
 
longitude should be first.
 
Best,
Phil
 
 
On 27 Jul 2019, at 22:37, Anton van Rosmalen <[email protected]> wrote:
 
List,

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 
 
    cs epsg:4326                                       # WGS84
    fix E6 43.811399 3.585060 194 10 10 10
 
I get
 
"can't determine meridian convergence for lat-long systems"
 
I can't find the format required for WGS84 lat/long in the manual, can someone
provide this?

Thanks,

Anton
 
 
can't determine meridian convergence for lat-long systems
 
Gesendet: Freitag, 18. Januar 2019 um 15:33 Uhr
Von: "Martin Budaj via Therion" <[email protected]>
An: "List for Therion users" <[email protected]>
Cc: "Martin Budaj" <[email protected]>
Betreff: Re: [Therion] Therion 5.4.2. potential bug
No, we don't modify existing releases. The fix will be included in 5.4.3 eventually, but until then you can use the latest snapshot (https://therion.speleo.sk/downloads/therion-setup-dev.exe). 
 
Martin
 
On Fri, Jan 18, 2019 at 9:32 AM Michael <[email protected]> wrote:

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 <[email protected]> Im Auftrag von Martin Budaj via Therion
Gesendet: Donnerstag, 17. Januar 2019 19:26
An: List for Therion users <[email protected]>
Cc: Martin Budaj <[email protected]>
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 <[email protected]> wrote:

On Sat, Jan 12, 2019 at 10:51 AM Michael <[email protected]> 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

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