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|Single message by Martin Wynne Topic: Direct loading of background maps|
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A further update.
I'm so pleased with the way this is looking that I have had a rush of blood to the head and now also purchased a subscription for Templot to the 6-inch maps.
In truth the 6-inch maps are too small-scale to be much help with detailed track planning, such as identifying the size of turnouts, etc. But they are the only historic maps currently available GB-wide, and available on subscription from the tile server.
The NLS 25-inch project has not yet covered the whole of GB (and may never do so for all areas), and the maps are not currently available on subscription, so cannot be directly loaded in Templot -- you must make your own screenshots from the NLS web site.
Here is a direct comparison between the two (Tewkesbury):
Clearly the 6-inch map is not going to be much help in the finer track details (or even the exact number of sidings), but it does show the ruling radii, correct positions of bridges, goods sheds, signal boxes, etc. So it is still useful, and could be used to correctly scale a 25-inch map over the top of it if the latter is set to transparent.
Talking of which, I have also included a function to perform the scaling for manually created screenshots, using the same maths as for the directly loaded ones.
For those adept with a calculator, here it is:
image width in mm =
513592.631 x COS(latitude) x pixels x scale / 2^zoom
513592.631 is a magic number derived from the circumference of the Earth at the Equator.
latitude is at the centre of the map area, e.g. 52.1234 degrees
pixels is the width of the image in pixels, e.g. 1280
scale is your model scale in mm/ft, e.g. 4
zoom is the zoom level of the map, e.g. typically in the range 17-21 for our purposes,
where zoom=0 means a map of the entire world.
Fortunately if you get zoom wrong it causes the width to double or halve for each step, so it is fairly obvious to correct.
Here is how to find the information in a typical URL:
p.s. 2^zoom means 2zoom i.e. 2 raised to the power zoom
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