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

[bruce at tomo.co.nz]

Thanks Thomas

Unfortunately I don’t know how to install or run from a commit or pull request that does not seem to have an installer.

I found my way here, but nothing there looks like a Therion install I can run.

Fix crash with circular map reference · therion/therion at 54c4a9a <https://github.com/therion/therion/actions/runs/24804177732> 

 

If you have any tips that would be great – I’ll be unavailable for about four days, so no immediate rush.

 

Thanks

Bruce

 

 

 

-----Original Message-----
From: Therion <therion-bounces at speleo.sk> On Behalf Of Thomas Holder
Sent: Thursday, 23 April 2026 10:21
To: List for Therion users <therion at speleo.sk>
Subject: Re: [Therion] map survey option now causes (fatal) error

 

Hi Bruce,

 

Can you try the branch from this pull request?

 

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

 

Best,

Thomas

 

 

 

> On Apr 18, 2026, at 22:59,  <mailto:bruce at tomo.co.nz> 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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