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#376 2019-11-22 15:55:30

iay
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From: Edinburgh
Registered: 2019-06-19
Posts: 10
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Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

ligfietser wrote:

Btw what do you mean with compressed? Do you mean the projection angle, at certain latitudes the maps can look distorted? You can either set this with Javawa GMTK or in Mapsource. Scripts of garmin.openstreetmap.nl are not available but the mkgmap options I have posted on github.

That was probably too vague for people to understand what I was saying.

I built a map for my area using your styles and mkgmap options from github. I loaded this map as well as the garmin.openstreetmap.org map for the same area (well, actually for the whole of the UK, which may be relevant) into Garmin Basecamp on my Mac.

The results were almost, but not quite, identical. The most obvious difference was that although a given number of pixels vertically on the screen seemed to correspond to the same set of features in both maps, that wasn't true horizontally: one map was compressed horizontally relative to the other, so that the same screen distance corresponded to more features on one map than on the other.

So close!

I did play around with JaVaWa GMTK a while back but I don't really understand the projection angle thing. It's also something I have to fire up a virtual machine to run, as it's a 32-bit application and Macs have gone 64-bit-only now. Mapsource is, I think, Windows-only? I've also seen a lot of posts that imply that the projection angle is set in the Windows registry, which obviously isn't going to apply...

I said the fact that my test map was just for the area around my city might be relevant. I've seen posts implying that the projection angle Basecamp picks in the absence of an explicit setting depends on the area covered by the map. So my problem may just go away if I make my own map of the whole UK. I will have to see if I can get some time to try that.

(I say "my problem" here, but it's not really an issue in practice as it's only a small variation between maps... but it tells me I'm not understanding something that might be important later, which bugs me a bit.)

Any other thoughts welcome.

Last edited by iay (2019-11-22 15:58:28)

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#377 2019-11-22 16:11:57

ligfietser
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Registered: 2008-10-09
Posts: 5,228
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Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

Ah ok, so that's the projection angle issue, you can't set it in mkgmap, it is somewhere stored in the Basecamp settings.
Don't know how to change that, you have to mail Javawa, he is an expert and familiar with Macs.

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#378 2019-11-22 16:20:37

iay
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From: Edinburgh
Registered: 2019-06-19
Posts: 10
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Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

ligfietser wrote:

Ah ok, so that's the projection angle issue, you can't set it in mkgmap, it is somewhere stored in the Basecamp settings.
Don't know how to change that, you have to mail Javawa, he is an expert and familiar with Macs.

I think I did mail him about something six months or so back. I then found a page on his web site that says he had a stroke a couple of years back and that's why he isn't maintaining his programs, so I felt bad about bothering him again. Is he in fact still active in the community?

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#379 2019-11-23 01:00:32

ligfietser
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Registered: 2008-10-09
Posts: 5,228
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Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

Yes, he is still active on the Dutch gps.nl forum, maybe you can search for a solution there or even post a question, I dont think they dont mind that you write it in English there: https://forum.gps.nl/viewforum.php?f=122

Last edited by ligfietser (2019-11-23 01:02:18)

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#380 2019-11-26 08:23:07

ligfietser
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Registered: 2008-10-09
Posts: 5,228
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Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

Ian,
In the meantime, Javawa has figured out a workaround for the Mac and posted it on his website: http://www.javawa.nl/projectionmac.html

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#381 2019-11-26 16:46:19

iay
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From: Edinburgh
Registered: 2019-06-19
Posts: 10
Website

Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

ligfietser wrote:

Ian,
In the meantime, Javawa has figured out a workaround for the Mac and posted it on his website: http://www.javawa.nl/projectionmac.html

I sent him some mail on the forum, but this looks like it should work. Many thanks, I hadn't noticed it!

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#382 2019-12-18 22:56:21

iay
Member
From: Edinburgh
Registered: 2019-06-19
Posts: 10
Website

Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

ligfietser wrote:

Ah ok, so that's the projection angle issue

I managed to figure out how to change the projection angle setting on my maps (it's tricky if you're using the App Store version of BaseCamp, so I might write that up somewhere). If I set several maps to the same projection angle, I do get the same scaling, so that's definitely what was going on.

All I'm missing is an idea of what the "projection angle" means... I thought if, for example, I set it to my latitude, that might correct the map so that square features on the ground showed up square, but that seems to be very far from true (everything is very stretched horizontally). Do you know of anything that describes which angle this represents? Googling around just tells me that there are a lot of different map projections, but I can't find which one Garmin uses, or what parameter this might represent.

Last edited by iay (2019-12-18 22:57:51)

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#383 2019-12-23 11:45:27

ligfietser
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Registered: 2008-10-09
Posts: 5,228
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Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

Can't answer your questions. Not sure but I have read somewhere Garmin uses https://en.wikipedia.org/wiki/Transvers … projection
Does this make sense?

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#384 2020-01-22 09:28:13

GerdP
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Registered: 2015-12-18
Posts: 1,166

Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

Hi ligfietser,
please participate in current mkgmap discussion regarding handling of railway=abandoned in the default style. It seems nobody likes the idea that we may add a routable line for this even if no highway tag is found.
I've now noticed that the "generic new" style was already changed accordingly.

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#385 2020-01-23 11:34:46

ligfietser
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Registered: 2008-10-09
Posts: 5,228
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Re: Worldwide routable Garmin maps: Missing/incorrect feature requests

Sorry, didnt follow the discussions Gerd. I can live with the changes in R4429, although I think if there is a routable path it should be corrected in the first place on OSM. And regarding the generic new style, I'm not maintaining it anymore and therefore I will close this topic because it just does not make sense anymore if Lambertus does not maintain his maps anyway.

Last edited by ligfietser (2020-01-23 11:37:00)

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