The Renaissance of the fixme= Tag ... via Osmand and overpass-turbo.eu

[Stephan75]

The following text is planned to be published as a blog posting, but I need a hosting for the mentioned screenshot. Maybe this works via a mailinglist item.

Questions or hints are also welcome here.

----------------------------------------------------------------------------------------------------------------------------

The Renaissance of the fixme= Tag ... via Osmand and overpass-turbo.eu

In the last weeks there has been some noise about the release of Osmand 2.0 as one of the most popular Android app for offline map display and navigation.

Besides that, Osmand is now also available for iOS devices since April 2015 ... check your appstore if you want.

Discussing the pros and cons of Osmand's app features or user interface issues can be a day filling task (but be sure that the core developers are very active for many month!) but I discovered a new feature in the map setting (not display setting) that is listed under "Details" and there called "OSM mapper assistant"

By enabling that feature there are at least three kinds of objects from the offline vector map that are displayed now:

1) purple (or magenta?) points and lines, when zooming in enough to them, some text is printed also in purple.

And its content is derived from OSM data tagged as fixme= ... (see attached screenshot)

2) same feature with dark green icons looking like a written piece of paper ... zoom in really more to view any OSM content tagged with note=*

3) Pairs of two capitalized letters like AM, EM, SH, TO, MM ... I assume that those are abbreviations for Amenity, Emergency, Shop etc.

Maybe Osmand itself has no own icon for those POIs?

About feature 1) and 2):

I never came accross any map display where fixme= and note= objects are displayed with corresponding text from the tag's value ...

BUT: don't forget about the rich-featured web service http://overpass-turbo.eu where you can display certain OSM objects according to special own queries.

So I wanted to know how many fixme= objects are around in my home town via overpass-turbo ...

Nothing easier than this: zoom and pan the slippy map there to the place or town you want to examine, enter the Wizard mode there and type "fixme=*" ... (without "" of course) then press "build and run query"

After some processing time you will get some coloured points and lines as result wich have a tag like fixme=*

(In case of no data display, try to zoom out one level, or move to another town)

overpass-turbo has a nice feature to display any output data styled via a MapCSS schema, see http://wiki.openstreetmap.org/wiki/Overpass_turbo/MapCSS

Thus you can easily add markers to each result data object with content from the object's value from the fixme tag.

Simply add the following lines at the bottom of the query on the left screen of overpass turbo:

{{style:
  node, way relation {
    text: fixme
  }
}}

and re-run your query once more via the upper left button ... Success?

Hint: You can do this query also for any objects with note=* ... just edit the query where needed.

Why can this be useful?

In my opinion I can better have a look at OSM objects with fixme=* to see whether a fix is already there, thus remove fixme tag from that object via an OSM editor.

Or try to fix OSM data itself when examining each fixme object.

Side effects: become familiar with Osmand's new features and map layers, and with overpass-turbo and its MapCSS features.

PS1: I don't know whether the iOS edition of Osmand can already display the layers like OSM mapper assistant ... can anyone report?

PS2: If you don't own any android or iOS device, but you can use Chrome internet browser on any desktop PC, you can install any android app where you have an apk installation file available in your browser ... this works with Osmand!

See https://developer.chrome.com/apps/getstarted_arc how to install the needed tool "ARC Welder", 

and download Osmand apk file via http://osmand.net ... scroll down to releases or nightly builds.

Stephan

[Stephan75]

[Max Erickson]

You could maybe start with a direct link to a populated overpass query:

https://overpass-turbo.eu/?q=LyoKVGhpcyBoYcSGYmVlbiBnxI1lcmF0ZWQgYnkgdGhlIG92xJJwxIlzLXR1cmJvIHdpemFyZC7EgsSdxJ9yaWdpbmFsIHNlxLBjaMSsxIk6CsOiwoDCnGZpeG1lPSrFiMKdCiovCltvdXQ6anNvbl1bdGnFjsWZxZsyNV07Ci8vxI_ElMSdciByZXN1bHRzCigKICDFrSBxdcSSxJrEo3J0IGZvcjogxYjFisWMxY7FkMWSxb0gbm9kZVsixYvFjWUiXSh7e2LEqnh9fSnFq8W-d2F5xpvGncWOxqDGosakxqbGqMaqxpXFtGzElGnFn8awxpHGn8ahxqPGpW_Gp8apxavGuMaAcMS3bsaIxbTFtsW4xbrFpsSYxph5xas-xavHk3NrZcS9cXTFqwrGo3N0eWxlxYbGl8aZLMWEecesxrrGvMWfIHvGlcSVeMWbxonHgAp9x7t9&c=ArhA5ew7dM

Then you can explain how to generate the second query, once you have convinced them it is useful.


Max

[Max Erickson]

Here is a more sensible link:

http://overpass-turbo.eu/s/9g0

I was otherwise monkeying around with overpass turbo and https and reused that tab for the previous message. The http shortlinks are a little nicer to look at...


Max

[Stephan75]

Hello Max,

Your links are correct ... but I intend to that users try to find a way to reach that aim on their own.

If users cannot follow my steps, then I need to improve my text.

Stephan

[Max Erickson]

I understood that your intent was to encourage people to learn the tool, I just thought it might give better results to first show what it does, as a motivator.

[xmd5a]

3) Does the following: displays dummy icons for tags that 1) does not supported by osmand but present in maps or 2) does not rendered normally at this zoom level. These icons have minzoom="17".

And yes, OSMMapperAssistant is available in iOS too (as well as all style-dependent options).

суббота, 9 мая 2015 г., 15:12:43 UTC+3 пользователь Stephan75 написал: