[ckan-dev] [ckan-global-user-group] Viewing realtime data in CKAN and styling geojson data

Mon Jul 13 15:46:48 UTC 2015

Hi Matt,

This is amazing, I'm glad the basic geospatial views have been useful as a
basis for this kind of stuff. In my view both the GeoJSON styling and real
time functionality should be part of ckanext-geoview, unless they add
complex requirements or conflict with the most common setup. Do send your
PRs!

Definitely worth a blog post, well done

Adrià

On 10 July 2015 at 11:10, Steven De Costa <steven.decosta at linkdigital.com.au
> wrote:

> Short answer:
> Good for a blog post? yes :)
>
>
> On Friday, July 10, 2015, Matthew Fullerton <matt.fullerton at gmail.com>
> wrote:
>
>> Short version:
>> @global: Are these things anything anyone would like to be able to use in
>> their CKAN? I would have to do some more work to add a UI for configuration
>> and so.
>> @dev: Are these things best put into new extensions with (inevitably)
>> some duplication or as options in current extensions with (inevitably) some
>> bloating of code over and above typically needed features?
>> @Steve: Would this be good material for (a) blog post(s)
>>
>> Long version:
>>
>> Dear CKAN community,
>> I have some experimental work that I would like to get some feedback on.
>>
>> - Styling GeoJSON data
>> The GeoView extension makes it easy to add resource views of GeoJSON
>> data. In our extended extension, attributes of the features (lines, points)
>> in the FeatureCollection are styled according to MapBox's SimpleStyle
>> spec[1]. Here's an example where the file has been processed to add colors
>> based on traffic flow state:
>>
>> https://smartlane.io/dataset/different-geo-visualizations/resource/49f0fcff-b3c8-48c8-b1c6-ddc33e4a83fe
>>
>> And another where the points are styled to (vaguely) look like colored
>> traffic lights:
>>
>> https://smartlane.io/dataset/different-geo-visualizations/resource/a4e397ad-cbd9-48bf-a77a-296c5fcc9559
>> (watch out, it can take a while to load)
>>
>> - Realtime GeoJSON data
>> Using leaflet.realtime[2], an extension for the leaflet library that CKAN
>> (GeoView) uses to visualize GeoJSON, maps can have changing points or
>> colors/styles. Here is an example of traffic lights changing according to
>> pre-recorded data:
>>
>> https://smartlane.io/dataset/traffic-light-stream-frankfurt-niederrad/resource/b6e4319e-f29b-480b-ad6d-214a753d3c2d
>>
>> I'll try and add a demo with moving data points soon, it ought to work
>> without any further code changes. The problem is often getting the live
>> data in GeoJSON format... but we have a backend for preprocessing other
>> data.
>>
>> - Realtime data plotting
>> By making only a few small changes, we are able to continuously update
>> Graph views. You can see the changing (or not) temperature in our office
>> here:
>>
>> https://smartlane.io/dataset/temperature-sensor/resource/bd645638-5541-499e-861b-f9c97e60f35a
>>
>> That's an example for 'lines and points' but it works for things like bar
>> graphs too. Last week we had people competing to achieve the best time in a
>> remote controlled robot race where their time was automatically displayed
>> as a bar on a 'leader board'. For good measure we had an automatically
>> updating histogram of the times too. Updating the actual data in CKAN is
>> easy thanks to the DataStore API.
>>
>> Best Regards,
>> Matt
>>
>> [1] https://github.com/mapbox/simplestyle-spec
>> [2] https://github.com/perliedman/leaflet-realtime
>>
>> --
>> Matthew Fullerton
>> Freelance Software Developer und EXIST Stipend holder with the start up
>> project "Tapestry" -http://www.smartlane.de/
>>
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> *EXECUTIVE DIRECTOR*www.linkdigital.com.au
>
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