[HOT] Mapswipe - whats happening with the data?

Pete Masters pedrito1414 at googlemail.com
Sun Mar 26 16:05:46 UTC 2017

Hi all, late to the party, but here are my two cents...

MapSwipe, anecdotally for now, does save mappers' time. In an area where
little OSM data exists, it can target mappers' efforts where people (or
roads or rivers) exist. In the kind of rural landscapes we deal with a lot
in MSF areas of interest, this cuts down the amount of time spent
'scanning' for stuff to map significantly. And, MapSwipe users can get
through a large area super fast.

In the Sierra Leone projects we used it slightly differently. We knew that
Kenema district had been partly mapped through several other initiatives
(Ebola mapping  and the American Red Cross West Africa project for
example). We wanted comprehensive data in OSM, so we tasked the area in
MapSwipe and cross referenced the results with existing OSM data. Where
MapSwipers said 'yes, there is a building' but none existed in OSM the area
would be tasked for mapping. Where MapSwipers said 'yes, there is a
building' and building data existed in OSM, we discounted the area from the
tasking. Meaning that mappers were applying affords only where there were
gaps in the data.

I hope that is of interest. Couple of related points...

Each area is classified by three different users in MapSwipe, not four.

Paul Stewart wrote up the process for using Mapswipe to deduplicate mapping
efforts through the tasking manager

Disastermappers write here about how to access MapSwipe data and how they
process it

HOT Summit presentation on MapSwipe and pybossa https://youtu.be/pRZ_mWn0Lmc



On 26 Mar 2017 15:47, "Jo" <winfixit at gmail.com> wrote:

> It's definitely useful to save actual mapper's time. For validation I'm
> not sure it would be a big help.
> Op 26 mrt. 2017 3:12 p.m. schreef "john whelan" <jwhelan0112 at gmail.com>:
>> Would we be better ahead by using something like mapswipe to validate?
>> If a tile is OK there is no need to add to the map from the tool.  If three
>> mappers tick it then I would say its good to go.
>> The current system we use four mappers to mapswipe, then a conventional
>> mapper to map followed by a validator.  Six passes to get a validated
>> tile.  The other way would give you one in four passes three of which would
>> be on smartphones.
>> Cheerio John
>> On 26 March 2017 at 09:01, john whelan <jwhelan0112 at gmail.com> wrote:
>>> But does it address the concern about how much effort is expended
>>> compared to the value added?
>>> Cheerio John
>>> On 26 March 2017 at 08:44, Ralf Stephan <gtrwst9 at gmail.com> wrote:
>>>> Search is your friend. Searching for Mapswipe yields eg
>>>> http://tasks.hotosm.org/project/2521
>>>> where clearly the tiles are preselected. Also the description: "The
>>>> data are prepared by MapSwipe"
>>>> Regards,
>>>> On Sun, Mar 26, 2017 at 2:40 PM john whelan <jwhelan0112 at gmail.com>
>>>> wrote:
>>>>> I seem to recall the same area is mapswiped by four different people
>>>>> before a mapper maps it.
>>>>> Other than the size of the tile or which area to give priority to I
>>>>> think the advantage is that people can do it anywhere on a smartphone.
>>>>> I would hesitate to say if it is worth doing or not.  In future there
>>>>> might be a way to bring something into OSM via a review process.
>>>>> Cheerio John
>>>>> On 26 March 2017 at 08:22, Hakuch <hakuch at posteo.de> wrote:
>>>>> On 26.03.2017 14:13, john whelan wrote:
>>>>> > My understanding is that mapswipe is only used to identify where to
>>>>> map.
>>>>> > Not to contribute to the map.
>>>>> >
>>>>> > Cheerio John
>>>>> of course there is no data transmitted to OSM, but how is the data (I
>>>>> mean, marked tiles) used after I transmitted it? How much is it worth
>>>>> to
>>>>> do that mapswiping?
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