[Therion] XVI output misaligned (rotated) from original TopoDroid sketches

[Bruce Mutton]

Paul

I expect this looks like something that is controlled at the TopoDroid end of the process.

Maybe try asking on a TopoDroid forum?

 

Bruce

 

From: Therion <therion-bounces at speleo.sk> On Behalf Of Paul Rowe
Sent: Wednesday, 21 April 2021 09:49
To: List for Therion users <therion at speleo.sk>
Subject: Re: [Therion] XVI output misaligned (rotated) from original TopoDroid sketches

 

Hi Bruce,

No, it's not magnetic declination. There is a fixed station in the survey for the entrance, and for this lat/long the declination is 20.5 degrees.

 

You can see an example here, with the green splay generated from the TopoDroid sketch and the grey splay coming from the exported XVI layer:



 

The XVI difference is -1.1 degrees. That's about the difference between true north and grid north at this location on the NZGD2000 maps. I have tried exporting using 'north grid' and 'north true' but that hasn't made a difference.

 

Not sure if anyone has tried generating an XVI and putting it under the TopoDroid sketch to compare them?

 

Cheers,

Paul

 

 

 

On Wed, 21 Apr 2021 at 08:19, Bruce Mutton <bruce at tomo.co.nz <mailto:bruce at tomo.co.nz> > wrote:

Hi Paul

The misalignment is not matching the magnetic declination by any chance?

Or the difference between a manual declination setting in either application and an automatically calculated declination based on a cs setting?

 

I have not used TopoDroid since it was able to export sketches, so not much help, and have forgotten much of what I did know anyway.

 

Bruce

 

From: Therion <therion-bounces at speleo.sk <mailto:therion-bounces at speleo.sk> > On Behalf Of Paul Rowe
Sent: Tuesday, 20 April 2021 10:43
To: List for Therion users <therion at speleo.sk <mailto:therion at speleo.sk> >
Subject: [Therion] XVI output misaligned (rotated) from original TopoDroid sketches

 

Hi,

I'm just trying out TopoDroid for the first time as the source for scraps in Therion. I can view the th2 scraps in Therion and can see the stations and splays.

 

However, if I then output to XVI and add the XVI as a background image in Therion, the XVI is misaligned. The scale is correct and I just manually move the background XVI image to line up with one of the stations in the scrap. The XVI layer is rotated slightly (1 or 2 degrees) and then doesn't line up across the rest of the sketch imported from TopoDroid.

 

Has anyone run into this? I thought it might be a difference between true north and grid north, but exporting to XVI with north set to true or grid doesn't fix the issue.

 

The XVI layer isn't strictly necessary as the stations and splays are already visible in the TopoDroid sketch output. It does make me worry that there's some underlying problem though that I need to fix.

 

Thanks,

Paul Rowe

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