[Therion] Therion 5.4.2. potential bug

[Philippe Vernant]

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 <A.M.vanRosmalen at gmx.net> 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" <therion at speleo.sk>
> An: "List for Therion users" <therion at speleo.sk>
> Cc: "Martin Budaj" <m.budaj at gmail.com>
> 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 <https://therion.speleo.sk/downloads/therion-setup-dev.exe>). 
>  
> Martin
>  
> On Fri, Jan 18, 2019 at 9:32 AM Michael <knollesimage at t-online.de <mailto:knollesimage at t-online.de>> wrote:
> Thank you, Martin, for the quick fix.
> 
> Is it also fixed in
> 
> https://therion.speleo.sk/downloads/therion-setup-5.4.2.exe <https://therion.speleo.sk/downloads/therion-setup-5.4.2.exe>
> ?
> 
> Regards,
> 
> Michael.
> 
>  
> Von: Therion <therion-bounces at speleo.sk <mailto:therion-bounces at speleo.sk>> Im Auftrag von Martin Budaj via Therion
> Gesendet: Donnerstag, 17. Januar 2019 19:26
> An: List for Therion users <therion at speleo.sk <mailto:therion at speleo.sk>>
> Cc: Martin Budaj <m.budaj at gmail.com <mailto:m.budaj at 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.budaj at gmail.com <mailto:m.budaj at gmail.com>> wrote:
> 
> On Sat, Jan 12, 2019 at 10:51 AM Michael <knollesimage at t-online.de <mailto:knollesimage at 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 <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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