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

Sun Apr 19 01:49:05 CEST 2026

The error does not occur for.

therion 6.3.4 (2025-04-08)

cavern - Survex 1.4.17

therion 6.3.4+1f7444ab (2025-08-12)

therion 6.3.4+ba4385e9 (2025-11-19)

And for .

therion 6.3.4+df4b6741 (2026-01-18)

therion 6.3.4+999e03f9 (2026-02-21)

I get.

C:\Program Files\Therion\therion.exe: error -- Press ENTER to
exit!./GreenlinkArea/./middleearthcave/INDEXMiddleEarthElev290.th [225] --
incompatible map projection -- MiddleEarthElev290Map

.which is a different bug, previously reported, initially as
https://github.com/therion/therion/issues/744.

Bruce

From: bruce at tomo.co.nz <bruce at tomo.co.nz> 
Sent: Sunday, 19 April 2026 08:59
To: 'List for Therion users' <therion at speleo.sk>
Subject: map survey option now causes (fatal) error 

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20260419/998666cb/attachment.htm>