[Therion] map survey option now causes (fatal) error

[Thomas Holder]

Hi Bruce,

Can you try the branch from this pull request?

https://github.com/therion/therion/pull/746

Best,
Thomas



> On Apr 18, 2026, at 22:59, bruce at tomo.co.nz wrote:
> 
> For a few maps in a few surveys I have been using the -survey option to constrain map statistics to match the underlying survey (page 34-35 of Therion Book).
> I think some recent version of Therion has broken this.
>  The start of my map definition…
>    map MiddleEarthElev290Map \
>   -title "Middle Earth and<br>Lower Greenlink Caves<br>Elevation looking 290 deg" \
>   -projection [elevation 290 deg] \
>   -survey MiddleEarth # survey option forces map statistics to match the survey
>  The error reported…
> via Mapiah…
> C:\Program Files\Therion\therion.exe: error -- Press ENTER to exit!./GreenlinkArea/./middleearthcave/INDEXMiddleEarthElev290.th [579] -- invalid survey reference – MiddleEarth
>  via XTherion
> C:\Program Files\Therion\therion.exe: error -- ./GreenlinkArea/./middleearthcave/INDEXMiddleEarthElev290.th[579] -- invalid survey reference -- MiddleEarth
> writing xtherion file ... done
>  I am using… therion 6.3.4+d9c313ac (2026-03-29)
>   - using Proj 9.8.0, compiled against 9.8.0
>  Anyone else noticed this?
>  Thanks
> Bruce
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