OpenStreetMap

Mapbox satellite view experiment

Posted by kucai on 14 August 2014 in English (English)

Been trying to get more zoom than just level 17 with iD and Potlatch. I tried using browser zoom view, which is quite usable for Chrome and Mozilla, but doesn't work with IE. It didn't work with Potlatch either, the satellite view remained constant regardless of browser zoom level.

Also, using iD on 19in monitor with max browser zoom, will leave about 2 inches of vertical editing area. To get best alignment, I left out the tagging process for later so that I get to trace with thin lines instead of the fat iD highway line types.

It was a slow process. I'll rather wait for better imagery (or JOSM implementation of iD zoom interpolation) for those areas, which we'll probably get in 3 years. Hopefully!

Location: Taman Sri Semantan, Taman Permai Indah, Temerloh, Gemas, Negeri Sembilan, 28000, Malaysia

Comment from aseerel4c26 on 17 August 2014 at 01:01

I do not really get what you are writing about. I can zoom in more and more in iD ... the aerial imagery gets magnified and blurry. But this is what you seem to want, don't you? JOSM does the same. Just Potlatch2 does not magnify and stops to display is you zoom in too much.

What do you mean by "JOSM implementation of iD zoom interpolation"?

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Comment from Minh Nguyen on 17 August 2014 at 04:46

If you edit the location above (Taman Permai Indah), the Mapbox Satellite layer is only available up to z17. Kucai is trying to get the same imagery at a higher zoom level for easier editing, even if the imagery will be blurrier.

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Comment from aseerel4c26 on 18 August 2014 at 01:31

Thanks, Minh Nguyen! Ahh, yes at this location "Mapbox Satellite" in fact changes to X X X if you zoom in too much – in iD. In JOSM I experience the same, but I can fix it by replacing tms[19] with tms[17] in the imagery's source URL. After this JOSM just magnifies the zoom level 17. I guess(!) mapbox provides up to zoom level 19 - but not in very part of the world. In those parts it seems to serve error images ("X") which is not really helpful because you need to tell you editor to not use them.

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Comment from aseerel4c26 on 18 August 2014 at 01:50

For iD this works:

Block the wrong zoom levels 18 until 20 with Adblock. Filters to be added (for example):

  • tiles.mapbox.com/v4/openstreetmap.map-inh7ifmo/18
  • tiles.mapbox.com/v4/openstreetmap.map-inh7ifmo/19
  • tiles.mapbox.com/v4/openstreetmap.map-inh7ifmo/20

Works, see this screenshot.

You also may want to contact the iD developers, but that is only really possible via the issues list at github (which is an external company).

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Comment from aseerel4c26 on 18 August 2014 at 01:55

... oh, and, you have to clear your browser cache (e.g. by ctrl+F5) to see an effect after this. Otherwise you still have the X tiles available.

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Comment from kucai on 18 August 2014 at 03:34

thanks. I'll give it a try with iD. Already tried the JOSM trick, but the extrapolated zoom at level 18/19 is a bit too blocky but I am looking at trying to do that without sharpening applied.

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Comment from leodobrasil on 20 August 2014 at 11:54

In JOSM, rightclick at highest possible zoom level on the tile and then unselect the "automatic zoom" option. This generally freezes this zoom level, it will appear blocky when even increasing the zoom. I have only observed difficulties with this procedure when I worked with several image sources simultaneously activated.

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