[OSM-talk] Where have all the contributors gone?

Andy Robinson (blackadder-lists) ajrlists at googlemail.com
Mon Dec 1 16:09:44 GMT 2008

Igor Brejc [mailto:igor.brejc at gmail.com] wrote:
>Sent: 01 December 2008 3:57 PM
>To: Donald Allwright
>Cc: Andy Robinson (blackadder-lists); 80n; talk at openstreetmap.org
>Subject: Re: [OSM-talk] Where have all the contributors gone?
>How about covering your area with land use data using yahoo/landsat?
>It's something I do occasionally at the end of the work day when I'm
>totally exhausted - it's a nice dumb work which helps my brain turn off.
>And it comes handy for various hiking maps (example of my area:
>Anyway, I find mapping footpaths in forests much more interesting than
>plain old residential streets and roads - fewer people tend to cover
>them and sometimes it turns out be a real adventure - getting lost or
>meeting http://en.wikipedia.org/wiki/Image:Wild_Boar_Habbitat_3.jpg
>Not to mention the health benefits ;)

This really depends on where you live. If you live in a major city then you
don't have much option but to map residential streets. Otherwise it's a
special trip out to the countryside. Not something you can easily do in a
lunch hour or after work.

A few locations excepted (eg the USA) the majority of urban conurbations
don't have Yahoo aerial imagery. Landsat is fine for generality but isn't
detailed enough to be of any use whatsoever in an urban sprawl. You get much
better results from detailed on the ground mapping in these instances.

Landsat is however a great starting point for blank areas of the map,
especially were water is present. Perhaps we should all strive to pick an
area of the world and add what we can from Landsat. Would be a useful drive,
especially for those that don't much like tracing Yahoo! or those that use
JOSM and find displaying Yahoo! a faff.



>Donald Allwright wrote:
>> >At 9:00am on a Sunday morning, the meaning of "no cycling" on urban
>> >footpaths mysteriously disappears :-)
>> Unfortunately the mud doesn't, which if Saturday is anything to go by
>> would have been a bit too much for my non-mountain bike :-)
>> >The real challenge as has been pointed out is the white space without a
>> >nearby contributor. Especially in the sparsely populated locations of
>> >planet
>> Last winter I spent many dark evenings tracing the jungle rivers and
>> mountain lakes in Peru from the yahoo satellite images. The vast
>> majority of this will be nigh-on impossible to map using a GPS, so I
>> considered this to be a useful contribution in an area previously
>> mostly empty (OSM-wise). Some of these have probably never been mapped
>> to this level of accuracy before. And I still haven't finished yet
>> (Lakes are only about half-way up the country, and most of the coastal
>> rivers still need doing), so I reckon that'll keep me going this
>> winter. Bolivia and Brazil still have a lot of water unmapped, so that
>> would be something you could consider. I'm sure there are many other
>> parts of the world with similar needs. As urban areas lend themselves
>> well to on-the-ground mappers with GPS devices these are better left
>> to locals who can gather street names, but even here I reckon there's
>> room for basic mapping of major highways from satellite, as that will
>> form a framework around which people on the ground can organise their
>> own mapping. For example people might decide to map completely a
>> square enclosed by roads, rivers etc., but unless these features are
>> already on the map it's harder to plan something like this. When I
>> actually got to visit one such road I was able to adjust it on the
>> basis of GPS data, thus improving the accuracy.
>> Donald
>> ------------------------------------------------------------------------
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