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  • in reply to: OS contours for Great Britain OpenAndroMap? #26967

    geoffmozz
    Participant

    Christian, Apologies for the delayed reply. Your work on these contours is much appreciated. I’ve got all the UK ones on my phone now. They are helpful.

    Keep up the good work. I’m a keen paraglider pilot as well as a walker/climber and I see the XCTrack app is theming your maps to provide base maps on this sophisticated flight instrument app. Very good :-)

    1 user thanked author for this post.
    in reply to: OS contours for Great Britain OpenAndroMap? #26018

    geoffmozz
    Participant

    Christian, thanks very much for the work you’ve done creating this map of Scotland. I would like all my OpenAndroMaps to be like it :-) Personally I’d be very happy to have a much larger Great_Britain.map file if it contained these contours for the whole country.

    I really like the extra detail. The steeper, craggier parts of the mountains are more obvious. The bunched contours highlight steeper sections and also the really cliff-like bits are more likely to have rapid changes of directions in the contours over short distances. Contours alone don’t tell the whole story but are perhaps more useful with OSM-based maps because OSM crag markings aren’t great. Of course…you know all this.

    When I walk/climb in the mountains things are pretty easy when following paths but if you head into terrain where there are no paths then the contours and crag information are really useful. The more detailed contours in the V3 Scotland map are good.

    I’ve tried UK_Scotland_V3.map on my old Samsung S4 smartphone. The map still appears quickly and works well. It might be fractionally slower than the Great_Britain.map with 20m interval contours but nothing significant.

    I’ve climbed quite a few mountains in Scotland and have been comparing the Great_Britain.map with the UK_Scotland_V3.map. I’ve linked to a few examples on OpenTopoMap just to show where they are. These are steep rocky parts of the mountains and the more detailed contours in UK_Scotland_V3.map help show this. Good.

    Ben Nevis north face https://opentopomap.org/#map=15/56.80040/-5.00841
    An Teallach east face https://opentopomap.org/#map=15/57.79953/-5.26110
    Aonach Eagach ridge south face https://opentopomap.org/#map=14/56.67521/-5.02363
    Stob Coire Nan Lochan ne face https://opentopomap.org/#map=16/56.64907/-5.02130
    Liatach south face https://opentopomap.org/#map=14/57.55666/-5.48282

    Thanks for your efforts!

    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
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    in reply to: OS contours for Great Britain OpenAndroMap? #26007

    geoffmozz
    Participant

    Christian….that was quick. Well done. I can’t look at it immediately but I’ll get round to studying the map of Scotland over the next few days and report back. Thanks a lot.

    RE: Converting OS OpenData: I’ve downloaded the OS Terrain 50 data and examined some of it in QGIS but I don’t know how to convert it to HGT I’m afraid :-( I’ll do some Googling.

    RE: WayMaps. Here’s a conversation I had with their creators. It explains that they use OS OpenData for contours/crags and which files supply the crag information. They definitely use some OSM data. Here’s Ben Nevis on OpenTopoMap, note the paths between the CIC hut and Carn Mor Dearg. Now find Ben Nevis on the WayMaps, a radio button top right switches between OS and WayMaps. The WayMaps show the two OSM paths from the CIC hut up to Carn Mor Dearg and the OSM path around the CMD arete. These are absent from the OS map. See also the Help from the menu icon top left which explains that they use a mash up of OSM and OS data.

    NOTE: Free registration is needed at WalkLakes for access to the 1:25k OS maps. However you can see the 1:25k OS map of Ben Nevis at Bing maps without registering.

    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
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    in reply to: OS contours for Great Britain OpenAndroMap? #26000

    geoffmozz
    Participant

    Christian….thanks for trying this out.

    Just to be clear the WayMap I first posted is NOT an Ordnance Survey map although it does look like one. It just uses OpenData provided by the OS (crags and contours).

    These guys make the raster WayMaps using a mix of OpenStreetMap data and OS OpenData. They provide the WayMaps for WalkLakes. See the WayMaps radio button top right.

    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    in reply to: OS contours for Great Britain OpenAndroMap? #25988

    geoffmozz
    Participant

    Yes, I wasn’t paying too much attention to the technical implications of 10m interval contours. Partly because I don’t know enough about how contour detail and data are related. My queries are simply motivated by a desire for better contours.

    However, if getting the kind of contour detail seen in the WayMap that I first posted requires an unworkable amount of extra data then I’d be interested in seeing improved detail/resolution in the existing 20m interval contours. Perhaps that would have a tolerable data penalty?

    As a mountain walker/climber I’m aware that steep craggy ground is poorly represented and better contours would help overcome this. I picked the Pillar region in the Lake District as the 20m interval contours in the OpenAndroMap don’t give any clues as to the steep craggy nature of the area. The crag markings alone don’t represent the ground very well. See my screenshot of the OpenAndroMap. Here’s a picture of what Pillar Rock and it’s surroundings look like in real life…

    PillarRock

    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
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    in reply to: OS contours for Great Britain OpenAndroMap? #25983

    geoffmozz
    Participant

    Couldn’t the 10m contours just be revealed at higher zoom levels? The Garmin vector maps supplied by Talky Toaster do this and work well.

    Having read the Google translated version of the thread you linked to, it seems that 20m interval contours make up about 25% of the total file size. Let’s say 250MB of a 1 GB file. Presumably 10m contours would require double the contour data? ie 500MB/10m instead of 250MB/20m. That would make a 1GB map go to 1.25 GB with 10 m contours. That seems a tolerable increase in file size for better contours.

    I’d like to try a mapsforge map with 10m contours (revealed only at high zoom levels) and see how it performed. How much slower would it be to render on screen etc. Does a 10m contour interval mapsforge map exist?

    It may be that you’ve tried all this already and found it unworkable but your replies so far haven’t made me give up entirely…

    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    in reply to: OS contours for Great Britain OpenAndroMap? #25972

    geoffmozz
    Participant

    Christian….thanks for replying. I think your maps are great and use them at home in Britain and for trips abroad.

    How much extra data would 10m interval contours require?

    eg If you have an OpenAndroMap with 20m contours that has a file size of 1GB, approximately how big would the file become with 10m interval contours?

    It would be great to have the contour detail provided by the OS50 data as seen in the WayMap in my first post. It’s what micro SD cards are for.

    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    in reply to: OS contours for Great Britain OpenAndroMap? #25963

    geoffmozz
    Participant

    Sonny, I agree that the differences between the two screenshots you’ve shown are small.

    The WayMap that I pictured uses the OS50 contours. However the OpenAndroMap of Great Britain that I have uses a 20m contour interval and there’s obviously less detail in the contours than any of the examples that you and I have posted. eg Look at the contours around the crags SW of ‘Steeple’. The OS50 WayMap contours in my first post look quite good.

    Do you know why the OpenAndroMap contours don’t have the 10m interval and detail shown in your screenshot? The maps would be better if they did. Here’s a screenshot of my OpenAndroMap of Great Britain…

    pillar20mcontours

    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    • This reply was modified 1 year, 1 month ago by  geoffmozz.
    in reply to: English homepage broken? #24263

    geoffmozz
    Participant

    Thanks for your efforts :-) Working now.

    in reply to: English homepage broken? #24257

    geoffmozz
    Participant

    It was working earlier today but the fault seems to have returned….

    Attachments:
    in reply to: Editing 'Elevate 4' rendertheme to emphasize crags/cliffs #22472

    geoffmozz
    Participant

    John, that’s exactly the help I was hoping for. Thank you very much.
    I’ve successfully edited the theme using your tips and can now see the ‘cliff’ markings much more easily. 100% opacity, black and 1.5 stroke width makes them more apparent to my middle-aged eyes. I can tweak away now.
    You’re right that craggy areas aren’t well represented but the markings do at least warn that the ground is likely to be unsuitable for walking. I’d prefer not to miss any if I’m off paths and the mist descends.
    Cheers, Geoff

    • This reply was modified 1 year, 9 months ago by  geoffmozz.
    • This reply was modified 1 year, 9 months ago by  geoffmozz.
    • This reply was modified 1 year, 9 months ago by  geoffmozz.

    geoffmozz
    Participant

    IG,
    Thank you very much. That works perfectly.

    Losing the outlines of the national parks doesn’t matter for my purposes. I just want a map suitable for navigating with. Personally I find the green diagonals an unnecessary distraction.

    Great to have my query so promptly and expertly dealt with.
    10/10 for IG and the OAM forum :-)
    Cheers
    Geoff

    • This reply was modified 1 year, 9 months ago by  geoffmozz.
Viewing 12 posts - 1 through 12 (of 12 total)