[HOT] Mapping buildings something to think about

john whelan jwhelan0112 at gmail.com
Mon Apr 10 22:15:00 UTC 2017


I have just come across a batch 13 and 16 march 2017 with two mappers
mapping the same buildings.  I have deleted some duplicates but I suspect
there are more there.

Cheerio John

On 10 April 2017 at 17:50, john whelan <jwhelan0112 at gmail.com> wrote:

> I've been looking at one section of Africa and tagging untagged ways and
> area=yes ways.  It's a very small % of the entire continent.
>
> So far in the last couple of days I've tagged nearly 800 buildings and I
> have another 350 untagged ways to go through.
>
> Looking at the mappers and the profiles many of these seem to be from a
> number of recent building only projects.  Now these should be some of the
> simplest things to map.
>
> Missing 1,000 buildings in this area alone by not tagging them to me is
> significant.  It might not be to others.
>
> My estimate is of the buildings that are mapped 30% are not square or the
> building image and the mapping are different in size.  This is a
> conservative estimate.
>
> To save my fingers and wading through the to_do list could a bit more
> effort be made on the JOSM building_tool plugin front.  Jo / Polygot has a
> recipe for running it from a USB stick.  It is simple to use and very
> difficult to misstag.
>
> You get more buildings out of the mappers and best of all you don't get 45
> tiles on one project marked done as I've seen by a mapper who had mapped
> 186 buildings but managed not to tag them.
>
> This means the project data isn't reliable and in my experience end users
> like reliability. I'm not sure why, my programmers always thought that the
> speed the programs ran at was more important.
>
> Cheerio John
>
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