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1st message | this message only posted: 16 May 2019 14:44
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from:
richard_t
Nr. Spalding, South Holland, United Kingdom



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There's a map on NLS that I'd like to load as a background map, but it's just to big to fit on my screen at a zoom level that's usable.

What's the best way of taking a number of background map images and joining them together?

To complicate matters they aren't "slippy" maps, and span three different sheets (one of them is just the corner of a sheet).


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2nd message | this message only posted: 17 May 2019 11:54
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
richard_t wrote: There's a map on NLS that I'd like to load as a background map, but it's just to big to fit on my screen at a zoom level that's usable.

What's the best way of taking a number of background map images and joining them together?

To complicate matters they aren't "slippy" maps, and span three different sheets (one of them is just the corner of a sheet).
Hi Richard,

Is this related to your previous topic at:

 http://85a.co.uk/forum/view_topic.php?id=3373&forum_id=1



We need a bit more information, otherwise my reply will turn into a long ramble of ifs and buts.

Which maps and date?

Are you on Windows or Wine/CrossOver/Linux?

Does the map need rotating to get a better fit on the screen?

What model gauge and scale?



The old OS County Series map sheets predate the invention of the OS Grid in 1936. They use a different map projection, and don't align properly with each other on the sheet edges.

For the Georeferenced slippy maps the NLS resample the scans on the global georeferencing scheme. In the process some straight lines become gently curved, some gently curved lines become straight, and the whole map is rotated slightly. These effects become more noticeable as you move a long way from the OS datum in the middle of the UK.

For the "Find by place" maps the NLS publish the original single sheet scans unmodified.



The basic process is simple:

0. set your model gauge and scale. Don't forget this bit.

1. make the first screenshot. Import it as a picture shape at the correct scaled size. On Windows, Templot can do all this for you easily.

(On Wine it needs some manual calculations.)

2. do the same for the second screenshot.

3. make it transparent.

4. zoom in and manually shift it over the first one into alignment with it.

5. switch off the transparency and zoom out.

6. repeat the process for as many further screenshots as needed.

7. zoom out and use the crop/combine function to get them all into a single picture shape.

8. if necessary use the twist function to rotate it to the best screen fit. In Templot this is a very slow process and will add a lot of unwanted white space in the corners. But it will get there in the end on any reasonably specified system, and retain the correct scaling.

9. use the crop/combine function again to remove the unwanted white space.

10. if desired, copy the image out of the picture shape into your graphics editor. Change the contrast, brightness, grey scale, negative image, or whatever to make a comfortable image for working over (without changing the image size in any way). Copy and paste it back into the picture shape.

11. save the background shapes.



If you can say which maps, etc., I will make some screenshots showing the above.

cheers,

Martin.

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3rd message | this message only posted: 20 May 2019 08:14
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from:
richard_t
Nr. Spalding, South Holland, United Kingdom



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Hi Martin

Thanks for the response, and to answer your questions:

The area I'm currently interested in is around Cornbrook, so the maps are (I think referencing by URL might be easiest):

https://maps.nls.uk/view/126522839 (Lancs CIV. 10)

https://maps.nls.uk/view/126522866 (Lancs CIV. 14)

https://maps.nls.uk/view/126522857 (Lancs CIV. 13)

The slippy map has some interesting alignment/scanning issues :-(

I'm not too worried at this point over the rotation.

I'm on Windows 10, and after a bit of a reality check, looks like the Scale/Gauge will be S4-X.

Your method below is very similar to how I would have approached it in my ancient copy of Photoshop... but obv. Templot does a brilliant job on the scaling :-D

Thanks again

Richard

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